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Networking

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Networking
Altynay Toiguliyeva
Quiz por Altynay Toiguliyeva, atualizado more than 1 year ago
Altynay Toiguliyeva
Criado por Altynay Toiguliyeva mais de 4 anos atrás
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Resumo de Recurso

Questão 1

Questão
In version field of IPv4 header, when machine is using some other version of IPv4 then datagram is
Responda
  • Rejected
  • Accepted
  • Interpreted
  • Interpreted incorrectly

Questão 2

Questão
Network layer at source is responsible for creating a packet from data coming from another
Responda
  • Station
  • Link
  • Node
  • Protocol

Questão 3

Questão
Header of datagram in IPv4 has
Responda
  • 0 to 20 bytes
  • 20 to 40 bytes
  • 20 to 60 bytes
  • 20 to 80 bytes

Questão 4

Questão
An IPv4 datagram can encapsulate data from several higher-level protocols such as UDP, ICMP, IGMP and
Responda
  • TCP protocols
  • CDM protocols
  • ATM protocols
  • IEEE protocols

Questão 5

Questão
To record Internet routers of IPv4, that handles datagram is responsibility of
Responda
  • Record protocol
  • Record Data
  • Record Route
  • Record Header

Questão 6

Questão
Internet has chosen datagram approach to switching in the
Responda
  • Data Link Layer
  • Network Layer
  • Physical Layer
  • Presentation Layer

Questão 7

Questão
In IPv4 protocol, each datagram is handled
Responda
  • Independently
  • Dependently
  • Priority basis
  • Systematically

Questão 8

Questão
CCT stands fo
Responda
  • Close Circuit Transmission
  • Congestion Controlled Traffic
  • Congestion Controlled Transmission
  • Close Circuit Traffic

Questão 9

Questão
Communication between a computer and a keyboard involves ______________ transmission
Responda
  • Automatic
  • Half-duplex
  • Full-duplex
  • Single direction

Questão 10

Questão
Three or more devices share a link in ________ connection
Responda
  • Unipoint
  • Multipoint
  • Point to point
  • None

Questão 11

Questão
In asynchronous serial communication the physical layer provide
Responda
  • start and stop signalling
  • flow control
  • both start & stop signalling and flow control
  • none

Questão 12

Questão
The physical layer is responsible for
Responda
  • line coding
  • channel coding
  • modulation
  • all of the mentioned

Questão 13

Questão
A single channel is shared by multiple signals by
Responda
  • analog modulation
  • digital modulation
  • multiplexing
  • none

Questão 14

Questão
Wireless transmission can be done via
Responda
  • radio waves
  • microwaves
  • infrared
  • all of the mentioned

Questão 15

Questão
Which is not a application layer protocol?
Responda
  • HTTP
  • SMTP
  • FTP
  • TCP

Questão 16

Questão
The packet of information at the application layer is called __________
Responda
  • Packet
  • Message
  • Segment
  • Frame

Questão 17

Questão
Which one of the following is an architecture paradigms?
Responda
  • Peer to peer
  • Client-server
  • HTTP
  • Both Peer-to-Peer & Client-Server

Questão 18

Questão
Application layer offers _______ service
Responda
  • End to end
  • Process to process
  • Both End to end and Process to process
  • None of the mentioned

Questão 19

Questão
E-mail is _________
Responda
  • Loss-tolerant application
  • Bandwidth-sensitive application
  • Elastic application
  • None of the mentioned

Questão 20

Questão
To deliver a message to the correct application program running on a host, the _______ address must be consulted
Responda
  • IP
  • MAC
  • Port
  • None

Questão 21

Questão
Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core
Responda
  • True
  • False

Questão 22

Questão
With ADSL, each subscriber gets more downstream bandwidth than upstream bandwidth
Responda
  • True
  • False

Questão 23

Questão
Two packets A and B are sent in that order through a connection-oriented communication network. They could arrive at the destination:
Responda
  • in any order, after having traversed the same route.
  • only in the order A-B, after possibly having traversed different routes.
  • in any order, after possibly having traversed different routes
  • only in the order A-B, after having traversed the same route.

Questão 24

Questão
Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination:
Responda
  • in any order, after possibly having traversed
  • in the order A-B, after having traversed the same route
  • in any order, after having traversed the same route.
  • in the order A-B, after possibly having traversed different routes

Questão 25

Questão
The Internet received its name in the 1980s because:
Responda
  • it was an interim (temporary) design of what it later became, but the name stuck.
  • it was meant to be a network internal to the United States Department of Defense.
  • it consisted of many interconnected networks.
  • it achieved international scope with the addition of the City University of London.

Questão 26

Questão
All store-and-forward networks are
Responda
  • broadcast networks.
  • packet or message switched networks.
  • connection-based networks.
  • connectionless networks.

Questão 27

Questão
When a student in Hong Kong uses her computer to have a voice conversation with a teacher in Pittsburgh, the application she uses requires that the network deliver bits at a modest but constant bit rate. This is because, even though voice can be faithfully encoded in less than 64 Kbps, the late arrival of a voice sample produces a noticeable and unpleasant sound effect. Which of the following switching options will give you better quality?
Responda
  • Packet-switched
  • Message-switched.
  • Space-switched.
  • Circuit-switched

Questão 28

Questão
The Date: header in the HTTP response message indicates when the object in the response was last modified.
Responda
  • True
  • False

Questão 29

Questão
The process that sends messages into, and receives messages from, the network through a software interface is called a socket.
Responda
  • True
  • False

Questão 30

Questão
The transfer of an html file from one host to another is:
Responda
  • loss-tolerant and time sensitive
  • loss-intolerant and time sensitive.
  • loss-intolerant and time insensitive.
  • none of the above

Questão 31

Questão
A browser will generate header lines as a function of
Responda
  • browser type and version.
  • user configuration of browser.whether the browser has a cached version of the requested object.
  • whether the browser has a cached version of the requested object.
  • all of the above

Questão 32

Questão
SMTP is used to:
Responda
  • to transfer messages from one mail server to another
  • to transfer messages from mail server to a user agent.
  • to define the format of message headers.
  • all of the above.

Questão 33

Questão
DNS resource record has Type=MX. Then:
Responda
  • Value is the hostname of the DNS server that is authoritative for Name.
  • Value is the IP address of the mail server that has the alias hostname Name.
  • Value is the hostname of the mail server that has the alias hostname Name.
  • none of the above.

Questão 34

Questão
Local DNS name servers:
Responda
  • cache resource records, but discard them after a period of time that is on the order of a few days
  • cache resource records and never discard them.
  • obtain resource records from Web caches.
  • never cache resource records

Questão 35

Questão
Consider an HTTP Web server using persistent connections. Suppose the server spawns a separate process for each client that connects to the server. Then each of these spawned processes will have different server port numbers.
Responda
  • True
  • False

Questão 36

Questão
The size of the TCP RcvWindow never changes throughout the duration of the connection
Responda
  • True
  • False

Questão 37

Questão
The TCP segment has a field in its header for RcvWindow
Responda
  • True
  • False

Questão 38

Questão
Suppose host A sends host B one segment with sequence number 38 and 4 bytes of data. Then in this same segment the acknowledgement number is necessarily 42
Responda
  • True
  • False

Questão 39

Questão
The MSS is the maximum size of a TCP segment including headers
Responda
  • True
  • False

Questão 40

Questão
When a TCP segment arrives to a host, the socket to which the segment is directed depends on
Responda
  • the source IP address of the datagram that encapsulated the segment
  • the destination port numbe
  • the source port number
  • all of the above

Questão 41

Questão
UDP has which of the following characteristics
Responda
  • regulated send rate
  • connection state at the server
  • three-way hand shake for connection establishment
  • none of the above

Questão 42

Questão
When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses
Responda
  • the source port number
  • the source IP address
  • the destination port number
  • all of the above

Questão 43

Questão
The stop-and-wait protocol is highly inefficient when there is a
Responda
  • large distance between source and destination and the transmission rate is low
  • short distance between source and destination and the transmission rate is high
  • large distance between source and destination and the transmission rate is high
  • short distance between source and destination and the transmission rate is low

Questão 44

Questão
Pipelining requires which of the following
Responda
  • transmitting many packets before receiving acknowledgements
  • unique sequence numbers for each in-transit packet
  • sender-side buffering of unacknowledged packets
  • all of the above

Questão 45

Questão
Suppose a client sends an HTTP request message with the If-modified-since: header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code
Responda
  • 404 Not Foun
  • 200 OK
  • 304 Not Modified
  • none of the above

Questão 46

Questão
Streams are not needed in which of the following programs
Responda
  • TCPserver
  • UDPserver
  • TCPclient
  • UDPclient

Questão 47

Questão
For BitTorrent, which of the following is true
Responda
  • Although a peer may have 50 concurrent TCP connections with other peers, at any given instant of time it sends data to less than 10 other peers.
  • At a given instant of time, a peer A may upload to a peer B, even if peer B is not sending anything to A.
  • Among the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
  • All of the above

Questão 48

Questão
Consider the latency model for dynamic congestion windows. Which of the following components contribute to latency?
Responda
  • the sum of all the stalled times
  • round trip time, RTT
  • the transmission time of the object, O/R
  • all of the above

Questão 49

Questão
TCP applies fast retransmit to a segment when
Responda
  • it estimates unusually large RTTs
  • it receives three ACKs for an earlier segment
  • the segment's timer expires
  • none of the above

Questão 50

Questão
Nmap is often used to
Responda
  • do port scans over a range of ports at a target host
  • measure throughput between hosts
  • measure round-trip times between hosts
  • decipher encrypted traffic

Questão 51

Questão
With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with
Responda
  • an initial sequence number that is a hash of the IP addresses and port numbers in the SYN segment (as well as of other things)
  • initial sequence number 1
  • a randomly chosen initial sequence number
  • none of the above

Questão 52

Questão
Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination
Responda
  • True
  • False

Questão 53

Questão
The primary role of a router is to forward datagrams from input links to output links
Responda
  • True
  • False

Questão 54

Questão
A forwarding table is
Responda
  • Used to find the proper interface to which the input interface should forward a packet
  • Configured using a centralized routing algorithm
  • Configured through routing protocol messages received by router
  • A and C
  • B and C

Questão 55

Questão
How are routing paths calculated?
Responda
  • The full route is mapped out in the datagram’s header.
  • Paths are calculated by routing algorithms.
  • Datagrams always flow on the same path and don’t need to be calculated.
  • The path is calculated based on available network bandwidth

Questão 56

Questão
A channel partitioning protocol has which of the following characteristics forwarding table is
Responda
  • it does not generate collisions.
  • all transmitting nodes get the same amount of bandwidth.
  • there is no master node.
  • all of the above

Questão 57

Questão
Match the following network service to the correct definition
Responda
  • Guaranteed Delivery - Guarantees a packet will arrive at its destination
  • Guaranteed Delivery with Bounded Delay- Guarantees delivery within a specified host-to-host delay bound
  • Guaranteed Maximum Jitter - Guarantees the amount of time between the transmission of two successive packets at the sender is equal to the amount of time between their receipt at the destination.
  • Я НЕ ЗНАЮ КАК ДОБАВИТЬ DROP DOWN ВОПРОС ПОЭТОМУ ПРОСТО ЗАПОМНИ ORDER

Questão 58

Questão
An ARP query packet is encapsulated in an IP datagram.
Responda
  • a link-layer frame addressed to a specific adapter.
  • a link-layer broadcast frame.
  • none of the above

Questão 59

Questão
Ethernet provides which of the following services to the network layer error detection
Responda
  • error detection
  • flow control
  • reliable data transfer
  • all of the above

Questão 60

Questão
For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter
Responda
  • it discards the frame without sending an error message to the network layer.
  • it discards the frame and sends an error message to the network layer.
  • it sends a NACK (not acknowledged frame) to the sending host.
  • it delivers the frame to the network layer, and lets the network layer decide what to do

Questão 61

Questão
A beacon frame sent by an AP includes
Responda
  • the AP's SSID.
  • the AP's MAC address.
  • both the AP's MAC address and SSID.
  • none of the above

Questão 62

Questão
Packets sent by two stations in 802.11 can collide because
Responda
  • at a given time, the random backoff values of the two stations are the same.
  • the packets are sent to different APs but on the same channel.
  • the two stations could be hidden from each other.
  • all of the above

Questão 63

Questão
An 802.11 frame includes
Responda
  • an acknowledgement field.
  • a sequence number field.
  • four address fields.
  • all of the above

Questão 64

Questão
Which of the following statements best describes the purpose of the SNMP protocol?
Responda
  • The SNMP protocol specifies the actions a network manager should take in response to a specific set of network fault conditions.
  • The SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices.
  • The SNMP protocol is used by the network manager to provision resources, such as bandwidth, server capacity and other computational/communication resources needed to meet the mission-specific needs of an enterprise

Questão 65

Questão
What is the purpose of the SNMP SetRequest message?
Responda
  • To allow a managed device to request and receive a set of initial values for MIB objects in the managed device.
  • To allow a managing entity to query the value of a set of MIB object values in a managed device.
  • To allow a managing entity to set the value of one or more MIB objects in a managed device

Questão 66

Questão
What is the purpose of a presentation service?
Responda
  • To allow a client to inform a server that it (the client) is present and ready to receive data.
  • To encode, transmit, and translate data from one machine-specific format to another.
  • To display data in a format specified by a user.
  • None of the above

Questão 67

Questão
Filtering in a firewall can be based on:
Responda
  • source and destination IP addresses
  • TCP ACK bits
  • source and destination port numbers
  • all of the above

Questão 68

Questão
How we call the link-layer packets?
Responda
  • Frames
  • Packets
  • Datagrams
  • Segment
  • Message

Questão 69

Questão
What is the segment?
Responda
  • application-layer packet
  • network-layer packet
  • data-link-layer packet
  • transport-layer packet
  • physical-layer packet

Questão 70

Questão
Most packets use these as the inputs to the links. This means that the packet switch must receive the entire packet before it can begin to transmit the first bit of the packet onto the outbound link
Responda
  • Queuing delays
  • Store-and-forward
  • Reliable data
  • Datagram

Questão 71

Questão
The housing a large number of hosts, is often used to create a powerful virtual server
Responda
  • Supercomputer
  • Data center
  • Server house
  • Host center

Questão 72

Questão
Match the following delays to the correct definition
Responda
  • Processing delay The time required to examine the packet’s header and determine where to direct the packet
  • Queuing delay Packet waits to be transmitted onto the link
  • Transmission delay This is the amount of time required to push all of the packet’s bits into the link
  • Propagation delay Once a bit is pushed into the link, it needs to be spread to router
  • просто запомни ))))

Questão 73

Questão
________________ is a repository of information linked together from points all over the world
Responda
  • WWW
  • HTTP
  • HTML
  • None

Questão 74

Questão
In a URL, the _______ is the full name of the file where the information is located
Responda
  • Path
  • Protocol
  • Host
  • None

Questão 75

Questão
A cookie is made by the ________ and eaten by the _______
Responda
  • Client; client
  • Client; sever
  • Sever; server
  • None

Questão 76

Questão
In HTTP, the first line in a request message is called a _______ line; the first line in the response message is called the ________ line
Responda
  • Request; response
  • Response; request
  • Response; status
  • Header line; request
  • None

Questão 77

Questão
DNS provides a few other important service in addition to translating hostnames to IP addresses
Responda
  • Host aliasing
  • Delaying the packets
  • Congestion control
  • Load distribution
  • Mail server aliasing

Questão 78

Questão
Small piece of data sent from a website and stored in the user's web browser while the user is browsing
Responda
  • Web cache
  • Set-cookies
  • Cookies
  • Status line

Questão 79

Questão
A network entity that satisfies HTTP requests on the behalf of an origin Web server
Responda
  • Web browser
  • Client
  • Root servers
  • Data center
  • Proxy server
  • DNS servers

Questão 80

Questão
How many ports can be per IP address
Responda
  • 65,535
  • 68,535
  • 65,335
  • 64,535
  • 60,535

Questão 81

Questão
FTP is built on _____ architecture
Responda
  • Client-server
  • P2P
  • Both of the mentioned
  • None

Questão 82

Questão
FTP uses _____ parallel TCP connections to transfer a file
Responda
  • 1
  • 2
  • 3
  • 4

Questão 83

Questão
If 5 files are transfered from server A to client B in the same session. The number of TCP connection between A and B is
Responda
  • 5
  • 10
  • 2
  • 6

Questão 84

Questão
The password is sent to the server using _____ command
Responda
  • PASSWD
  • PASS
  • PASSWORD
  • None

Questão 85

Questão
Time it takes for a small packet to travel from client to server and then back to the client
Responda
  • RIP
  • RDT
  • ARP
  • TTL
  • RTT

Questão 86

Questão
____________is a physical-layer device that acts on individual bits rather than frames
Responda
  • A hub
  • A host
  • Switch
  • Router

Questão 87

Questão
Define to which level of the network protocols are belong to
Responda
  • IMAP,POP3, DNS, FTP, Telnet-Application layer
  • TCP, UDP-Transport layer
  • ICMP, RIP, IPv4, IPv6-Network layer
  • ARP, ATM, Token ring-Data Link layer
  • Bluetooth, 802.11-Physical layer
  • ПРОСТО ЗАПОМНИ ВСЕ

Questão 88

Questão
___________algorithm computes the least-cost path between a source and destination using complete, global knowledge about the network
Responda
  • Virtual circuit
  • A global routing
  • Forwarding
  • None

Questão 89

Questão
Computer networks that provide only a connection service at the network layer are called
Responda
  • Datagram network
  • Virtual-circuit networks
  • Network
  • None

Questão 90

Questão
Each time an end system wants to send a packet, it stamps the packet with the address of the destination end system and then pops the packet into the network
Responda
  • Virtual-circuit networks
  • Network
  • Datagram network
  • None

Questão 91

Questão
Determine the correct class of the following IP address: 93.44.123.184
Responda
  • A
  • B
  • C
  • D
  • E

Questão 92

Questão
Determine the correct class of the following IP address: 160.23.244.224
Responda
  • A
  • B
  • C
  • D
  • E

Questão 93

Questão
Convert the following IP address: 192.224.224.15 to the binary
Responda
  • 11000000. 11100000. 11100000. 00001111
  • 11001100.11000111.11100011. 00001111
  • 01010110. 01111011. 00000001. 00000001
  • 11000100. 00000101. 01111011. 11011101

Questão 94

Questão
Convert the following IP address: 93.44.123.184 to the binary
Responda
  • 11001100.11000111.11100011. 00001111
  • 01010110. 01111011. 00000001. 00000001
  • 11000100. 00000101. 01111011. 11011101
  • 01011101. 00101100. 01111011. 10111000

Questão 95

Questão
Convert the following IP address: 158.0.147.85 to the binary
Responda
  • 11001100.11000111.11100011. 00001111
  • 01010110. 01111011. 00000001. 00000001
  • 10011110. 00000000. 10010011. 01010101
  • 11000100. 00000101. 01111011. 11011101

Questão 96

Questão
set of rules that the sending of rules that the sending program must follow so that the Internecan deliver the data to the destination program is called
Responda
  • Application Programming Interface (API)
  • DNS domain name system
  • Internet transport-layer protocol (TCP or UDP)
  • Encapsulation

Questão 97

Questão
Below provided a typical HTTP response message.  Let’s take a careful look at this response message What three sections has HTTP response message?
Image:
Cf (binary/octet-stream)
Responda
  • What three sections has HTTP response message?
  • header lines, entity body, and then the URL structure.
  • an initial status line, entity body, conclusion.
  • an initial status line, six header lines, and then the entity body.
  • header lines, entity body, and then the response

Questão 98

Questão
Below provided a typical HTTP response message. Let’s take a careful look at this response message. It has three sections: an initial status line, six header lines, and then the entity body The entity body is the meat of the message—it contains.
Image:
Cf (binary/octet-stream)
Responda
  • the information about receiver
  • the status line indicates that the server is using HTTP/1.1 and that everything is OK
  • the information about all the destination of packet
  • the requested object itself (represented by data data data data data)

Questão 99

Questão
Below provided a typical HTTP response message. Let’s take a careful look at this response message. It has three sections: an initial status line, six header lines, and then the entity body In this example, the status line.
Image:
Cf (binary/octet-stream)
Responda
  • In this example, the status line.
  • has the information about receiver
  • has the requested object itself (represented by data data data data data …)
  • has the information about all the destination of packet
  • indicates that the server is using HTTP/1.1 and that everything is OK

Questão 100

Questão
How does an operating system identify the application to which data coming in from the network should be relayed
Responda
  • By the protocol with which the data was sent
  • Only one application at a time is given access to the network.
  • By the port number carried by the transport protocol
  • By the file extension of the data

Questão 101

Questão
The IP address space is organized in a hierarchy (I) to make the routing task more scalable, (II) to decrease inefficient fragmentation of the address space (III) to give institutions managing local-area networks autonomous control over the assignment of addresses to computers
Responda
  • I and III only
  • II only
  • none
  • I only

Questão 102

Questão
Which of the following protocols are essential to the existence of the Traceroute tool? 1 IP, 2 ICMP, 3 TCP
Responda
  • I and III only
  • II only
  • II and III only
  • I only

Questão 103

Questão
A difference between routers and switches is that
Responda
  • switches connect only to hosts, whereas routers connect networks
  • switches hold IP routing tables only for only local subnets
  • routers parse, process, and modify IP headers
  • routers perform the same function as switches but the two are marketed in very different way

Questão 104

Questão
At which of the following layers of the OSI protocol stack can the Internet Control Message Protocol be implement. 1Network, 2transport, 3Data link
Responda
  • I or II
  • I only
  • II only
  • III only

Questão 105

Questão
How to understand the connection-oriented protocol?
Responda
  • means that before the client and server can start to send data to each other, they first need to handshake and establish a TCP connection
  • means that provide an application with one or more security services can also provide timing guarantees
  • offers a different set of services to the invoking applications

Questão 106

Questão
Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core
Responda
  • True
  • False

Questão 107

Questão
Twisted-pair cooper wire is no longer present in computer networks
Responda
  • True
  • False

Questão 108

Questão
Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination
Responda
  • in any order, after possibly having traversed different routes.
  • in the order A-B, after having traversed the same route.
  • in any order, after having traversed the same route.
  • in the order A-B, after possibly having traversed different routes

Questão 109

Questão
Compared to the wired transmission, wireless transmission typically has _____ attenuation and _____ maximum distance
Responda
  • higher, longer
  • lower, shorter
  • lower, longer
  • higher, shorter

Questão 110

Questão
Which of the following features of Ethernet has not remained constant since the advent of the technology?
Responda
  • Protocol header format
  • Protocol addressing
  • Use of CSMA-CD control
  • Transmission bandwidth

Questão 111

Questão
Which of the following internet applications typically transmit(s) packets over Transmission Control Protocol (TCP)? I.FTP client II.Audio streaming III.Web browser
Responda
  • I, II, and III
  • II only
  • I and II only
  • I and III only

Questão 112

Questão
In order to maintain network stability while Transmission Control Protocol (TCP) probes for additional bandwidth, rate increases are _____, and rate decreases are _____
Responda
  • multiplicative, additive
  • additive, additive
  • multiplicative, multiplicative
  • additive, multiplicative

Questão 113

Questão
Network clients use well-known _____ numbers to contact well-defined network services, such as Telnet and DNS servers
Responda
  • accept
  • connect
  • listen
  • port

Questão 114

Questão
Multicast communication generally refers to data that is
Responda
  • sent from several hosts to one host simultaneously
  • relayed through multiple routers
  • relayed through multiple bridges
  • sent from one host to several hosts simultaneously

Questão 115

Questão
The Internet Protocol (IP) defines the _____ layer of the Internet protocol stack
Responda
  • application
  • transport
  • physical
  • network

Questão 116

Questão
The term packetization refers to the process of
Responda
  • reassembling network packets for consumption by an application
  • using a digital instead of an analog transmission medium
  • using an analog instead of a digital transmission medium
  • splitting a message into fragments for network transmission

Questão 117

Questão
Which of the following statements is (are) true of network protocols?\n I.A protocol is a set of rules that facilitate communication among network applications.\n II.Only a single protocol may govern any transmission
Responda
  • II only
  • I and II
  • None
  • I only

Questão 118

Questão
Which of the following is a protocol used for communication between a web server and a web browser?
Responda
  • FTP
  • Telnet
  • World Wide Web (www)
  • HTTP

Questão 119

Questão
Which of the following is a disadvantage of connection-based protocols?
Responda
  • Unreliable connections
  • High error rates
  • Small MTU sizes
  • High startup costs

Questão 120

Questão
On a network, the term authentication typically refers to the process of
Responda
  • ensuring that users remain anonymous
  • ensuring that packets sent through the Internet cannot be intercepted
  • computing the checksum of packets
  • verifying the identity of a sender or receiver

Questão 121

Questão
Which of the following is the network-layer protocol of the Internet?
Responda
  • HTTP
  • Telnet
  • Ethernet
  • IP

Questão 122

Questão
Which of the following was designed to solve the problem of IP address space fragmentation?
Responda
  • Maximum Transfer Unit
  • Simple Network Management Protocol
  • Peering
  • Classless Inter Domain Routing

Questão 123

Questão
Which of the following IP header fields provide simple error detection?
Responda
  • Fragmentation
  • Time to live
  • Type of service
  • Checksum

Questão 124

Questão
Which of the following maps IP addresses onto datalink addresses?
Responda
  • Domain Name System (DNS)
  • Simple Network Management Protocol (SNMP)
  • Classless Inter Domain Routing (CIDR)
  • Address Resolution Protocol (ARP)

Questão 125

Questão
Consider an application running on host cs.cmu.edu that wants to send a packet to host ee.cmu.edu. Assuming no information is cached, the send request on cs.cmu.edu will cause which of the following events to happen first?
Responda
  • An ARP lookup
  • The packet is sent to the first router.
  • Host cs.cmu.edu performs an SNMP server query.
  • A DNS lookup

Questão 126

Questão
Which of the following can be used by a router to report a dropped packet to the packet's sender?
Responda
  • Simple Network Management Protocol (SNMP)
  • Border Gateway Protocol (BGP)
  • Dynamic Host Configuration Protocol (DHCP)
  • Internet Control Message Protocol (ICMP)

Questão 127

Questão
Which of the following IP header fields is designed to prevent a packet from remaining indefinitely in a routing loop?
Responda
  • Checksum
  • Length
  • Fragmentation
  • Time to live

Questão 128

Questão
Which of the following allows a host to be assigned an IP address automatically?
Responda
  • The simple network management protocol (SNMP)
  • The domain name system (DNS)
  • The address resolution protocol (ARP)
  • The dynamic host configuration protocol (DHCP)

Questão 129

Questão
Which of the following network exploration tools can be used to determine information about possible paths between one network host and another?
Responda
  • Ping
  • Netstat
  • Nslookup
  • Traceroute

Questão 130

Questão
The time required to examine the packet's header and determine where to direct the packet is part of the
Responda
  • Processing delay
  • Queuing delay
  • Transmission delay
  • Propagation delay

Questão 131

Questão
How we call the delay, when packet waits to be transmitted onto the link
Responda
  • Processing delay
  • Queuing delay
  • Transmission delay
  • Propagation delay

Questão 132

Questão
This is the amount of time required to push all of the packet's bits into the link
Responda
  • Processing delay
  • Queuing delay
  • Transmission delay
  • Propagation delay

Questão 133

Questão
The protocols of the various layers are called ___________
Responda
  • protocol stack
  • protocol layers
  • protocol group
  • protocol models

Questão 134

Questão
Which of the following OSI layers converts the ones and zeroes to electrical signals and places these signals on the cable?
Responda
  • Physical layer
  • Transport layer
  • Network layer
  • Application laye

Questão 135

Questão
Which of the following is most likely to be a MAC address assigned to a NIC?
Responda
  • 192.168.1.121
  • 24.17.232.75
  • 23.4F.17.8A.4C.10
  • 713.555.1212

Questão 136

Questão
Which layer of the TCP/IP model involves routing?
Responda
  • Physical layer
  • Transport layer
  • Application layer
  • Network layer

Questão 137

Questão
How much data can a typical frame contain?
Responda
  • 500 bytes
  • 1500 bytes
  • 1500 bits
  • 1 megabyte

Questão 138

Questão
Which of the following best describes an IP address?
Responda
  • A unique dotted decimal notation burned into every NIC
  • A unique 48-bit identifying number burned into every NIC
  • A dotted decimal notation assigned to a NIC by software
  • A 48-bit identifying number assigned to a NIC by software

Questão 139

Questão
Andalyn says complete 48-bit MAC addresses are allocated to NIC manufacturers from the IEEE. Buster says the IEEE only assigns the first 24 bits to manufacturers. Carlos says the IEEE assigns only the last 24 bits to manufacturers. Who is correct?
Responda
  • Only Andalyn is correct.
  • Only Buster is correct.
  • Only Carlos is correct.
  • No one is correct

Questão 140

Questão
Host A is sending host B a large file over a TCP connection. Assume host B has no data to send to A. Host B will not send acknowledgements to host A because host B cannot piggyback the acknowledgement on data
Responda
  • True
  • False

Questão 141

Questão
A channel partitioning protocol has which of the following characteristics
Responda
  • there is no master node
  • it does not generate collisions
  • all transmitting nodes get the same amount of bandwidth
  • all of the above

Questão 142

Questão
Ethernet provides which of the following services to the network layer
Responda
  • flow control
  • error detection
  • reliable data transferreliable data transfer
  • all of the above

Questão 143

Questão
Each LAN adapter has a unique LAN address
Responda
  • True
  • False

Questão 144

Questão
A channel partitioning has which of the following characteristics
Responda
  • there is no master node
  • it does not generate collisions
  • transmitting nodes get the same amount of bandwidth
  • all

Questão 145

Questão
IEEE standard ethernet CSMA/CD provides which of the following services to the network layer?
Responda
  • reliable data transfer
  • error detection
  • error correction
  • all

Questão 146

Questão
Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination
Responda
  • True
  • False

Questão 147

Questão
The Session layer communicates with which other layers
Responda
  • Application and Transport
  • Transport and Network
  • Transport and Presentation
  • Transport, Presentation and Network

Questão 148

Questão
application layer data is
Responda
  • message
  • frame
  • datagram
  • data
  • segment

Questão 149

Questão
Transport layer data is
Responda
  • message
  • frame
  • data
  • datagram
  • segment

Questão 150

Questão
Network layer data is
Responda
  • message
  • frame
  • datagram
  • segment
  • data

Questão 151

Questão
Link layer data is
Responda
  • message
  • frame
  • datagram
  • data
  • segment

Questão 152

Questão
HTTP persistent connection - multiple objects can be sent over single TCP connection between client, server
Responda
  • True
  • False

Questão 153

Questão
HTTP non- persistent connection - multiple objects can be sent over single TCP connection between client, server
Responda
  • True
  • False

Questão 154

Questão
SMTP is used to
Responda
  • to transfer messages from one mail server to another
  • to transfer messages from one mail server to another user agent
  • to define the format of message headers
  • to transfer messages from one user to another

Questão 155

Questão
The transmission of high-quality, interactive voice and video over the current Internet is difficult because today's Internet
Responda
  • does not really have sufficient throughput
  • gives higher priority to bulk data transfers
  • uses connectionless protocols
  • is unable to guarantee minimum throughput or maximum latency for a given connection

Questão 156

Questão
The throughput of a network link for an HTTP session is measured in two ways. Measurement A is the total amount of data received by the browser, divided by the duration of the session. Measurement B is the total amount of data received by the operating system on behalf of the browser, divided by the duration of the session. Which of the following statements about A and B is true?
Responda
  • B is smaller than A
  • A is smaller than B
  • B is equal to A
  • B and A are not related

Questão 157

Questão
Ethernet (IEEE 802.3) is an example of
Responda
  • a standard developed by the International Telecommunications Union
  • a successful example of the Internet's strategy of developing standards through "rough consensus and running code"
  • a de facto standard later developed into a de jure standard
  • an a priori standard

Questão 158

Questão
A packet with no data is sent from host A to host B on an otherwise idle network. The packet is found to have taken 35 milliseconds to reach B. The incremental overhead to send an additional byte (usually called the "throughput") is estimated to be five microseconds by repeatedly measuring the transmission times of long packets. Approximately, how long will an eight Kbytes (8192 bytes) packet take to reach B when sent from A?
Responda
  • cannot be determined from the information given
  • 55 milliseconds
  • 40 milliseconds
  • 76 milliseconds

Questão 159

Questão
When the data link layer applies "framing" to the data to be transmitted, it
Responda
  • cuts out the headers from higher layer protocols before transmission
  • adds the protocol headers from higher layers to the data before it transmits it
  • inserts flags to draw attention to high-priority data within a transmission
  • enhances it with extra data that permits the receiver to synchronize with the sender

Questão 160

Questão
In a broadcast-based network, longer propagation delays
Responda
  • destroy the carrier, making it impossible to sense it before transmitting
  • make it all the more critical to sense the carrier before transmitting
  • significantly decrease the benefit of sensing the carrier before transmitting
  • do not affect the cost-benefit trade-off of carrier sensing

Questão 161

Questão
What is the type of an "8+1" parity code that outputs 100101011?
Responda
  • Odd Parity
  • Null Parity
  • Cannot tell since we do not know which bit is the parity bit
  • Even Parity

Questão 162

Questão
A specific CSMA-CD network such as 10-BASET "Ethernet
Responda
  • has higher cost per node as nodes are added
  • can connect very distant node
  • works best for an even number of nodes
  • suffers performance degradation as nodes are added

Questão 163

Questão
A university has 20 computers in a laboratory that is currently served by several small 10 Base-T "Ethernet" hubs that are directly connected to each other. The network performance has been found to be lacking, and an upgrade is planned. The computers are identical and place a comparable load on the network that is relatively constant and modest for each computer (in the order of 500 Kbps). What would you suggest for the upgrade?
Responda
  • A small 10 Base-T switch to connect the existing hub
  • Replace the hubs with 100 Base-T hub
  • A new bank of dial-up modems
  • Replace the hubs with 10 Base-T switches

Questão 164

Questão
A sender's data link layer uses "bit stuffing" to
Responda
  • force the receiver to enlarge its flow control window
  • avoid confusing data bits with control bits
  • pad the data so that it has an even length for parity calculations
  • mark the start and the end of a frame

Questão 165

Questão
The Internet Protocol (IP) is used in the network layer of the Internet. Which service does IP provide to the transport layer?
Responda
  • Connectionless service via virtual circuits
  • Connectionless service via datagrams
  • Connection-oriented service via datagrams
  • Connection-oriented service via virtual circuits

Questão 166

Questão
A corporate information systems manager is interested in collecting statistics on the frequency of computer failures within the organization. Most failures result in an automatic reboot, so the failed computer is typically back on the network in less than a minute. The corporate network connects 1,500 computers in far-flung locations to which the average latency of a packet is 40 milliseconds. The manager asks you to write a tool that will collect the times at which failures occurred in which computers. She wants it by tomorrow, so the tool will have to be simple. On which protocol will you base your implementation?
Responda
  • TCP
  • SNMP
  • PLM
  • ICMP

Questão 167

Questão
A router is installed to interconnect 4 subnetworks with MTUs of 1024, 2048, 576, and 1556 bytes respectively. Nodes A and B are connected to the first and second subnets, respectively. An application on node A sends a 4096-byte datagram (e.g., using UDP) to an application on node B. How many IP fragments will the router process as a result?
Responda
  • 4
  • 5
  • 1
  • 2

Questão 168

Questão
The network interface card of a Web server that you manage has developed sporadic problems. You measure the packet loss rate from your desktop computer and immediately decide to replace the network card. After this simple operation, the Web server successfully rejoins the network, as confirmed by your officemate using her desktop computer. You eagerly go to your desktop to measure the improvement, but find instead that the Web server is not responding to any of your packets. What is your diagnosis?
Responda
  • The new network card does not work.
  • Your desktop computer is still trying to contact the server's old network card.
  • Your desktop computer's network card does not work.
  • The Domain Name System (DNS) has not yet updated its entry for the Web server.

Questão 169

Questão
In contrast to standards developed by traditional standards organizations like the International Telecommunications Union (ITU) or the International Standards Organization (ISO), standards developed by the Internet Engineering Task Force (IETF) can be
Responda
  • developed in secret by the members of the IETF until the standards mature sufficiently to withstand public criticism
  • modified arbitrarily by the Advance Research projects Agency (ARPA) of the United States Department of Defense, which originally developed the Internet
  • applied before they have been embodied in working implementations, in order not to delay progress
  • extensively critiqued and modified by individuals, without requiring them to have special membership status

Questão 170

Questão
there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive
Responda
  • e-mail
  • real time audio/video
  • text messaging
  • games

Questão 171

Questão
there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive
Responda
  • web documents
  • real time audio/video
  • text messaging
  • games

Questão 172

Questão
reliable transport between sending and receiving process refers to (protocol type)?
Responda
  • TCP
  • Transport control protocol
  • TCP service
  • Вы должны будете написать это поэтому запомните хоть один вариант

Questão 173

Questão
TP client contacts FTP server at port ______, using TCP
Responda
  • 21
  • twenty one
  • Запомни (хоть один вариант) так как тебе нужно будет это написать

Questão 174

Questão
331 Username OK, password required – status code refers to (protocol type)?
Responda
  • Запомни (хоть один вариант) так как тебе нужно будет это написать
  • FTP
  • File transport protocol

Questão 175

Questão
e-mails use ______________ protocol for sending messages
Responda
  • SMTP
  • FTP
  • HTTP
  • MIME

Questão 176

Questão
IMAP stands for
Responda
  • Internet Mail Access protocol
  • Запомни тебе надо это написать

Questão 177

Questão
POP stands for
Responda
  • Запомни тебе надо это написать
  • post office protocol

Questão 178

Questão
Which of the following statements are true about the TCP service model?
Responda
  • TCP uses a checksum to determine if the application data follows the right syntax
  • TCP delivers a stream of bytes from one end to the other, reliably and in-sequence, on behalf of an application
  • Because TCP encodes data with enough information to correct errors, it never needs to retransmit missing segments
  • Because TCP cannot trust the IP layer to format packets correctly, it must include the destination IP address in the TCP header
  • TCP is responsible for providing reliable, in-sequence end-to-end delivery of data between applications.

Questão 179

Questão
Which of the following are direct consequences of this design choice?
Responda
  • TCP is self-contained with sufficient addressing information in its header that it does not need the IP layer, or any other layer beneath it to deliver data to the far end
  • TCP will retransmit missing data even if the application can not use it - for example, in Internet telephony a late arriving retransmission may arrive too late to be useful
  • TCP can only work correctly if the layer below it also delivers data reliably and in sequence
  • TCP requires no connection state to be established prior to the end points communicating

Questão 180

Questão
The _______ layer lies between the network layer and the application layer.
Responda
  • physical
  • data link
  • transport
  • none

Questão 181

Questão
Which of the following is an application layer service?
Responda
  • remote log-in
  • mail service
  • file transfer and access
  • all

Questão 182

Questão
The_________ layer is responsible for the delivery of a message from one process to another
Responda
  • physical
  • data link
  • transport
  • network

Questão 183

Questão
The Internetworking Protocol (IP) is a ________ protocol
Responda
  • reliable
  • connectionless
  • connection oriented
  • none

Questão 184

Questão
____ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer
Responda
  • TCP
  • UDP
  • IP
  • HTTP

Questão 185

Questão
__________provides full transport layer services to applications
Responda
  • TCP
  • UDP
  • IP
  • HTTP

Questão 186

Questão
Translation of a domain name into an address called
Responda
  • name resolution
  • time needed to transmit L-bit packet into link = L (bits) / R (bits/sec)
  • bandwidth
  • packet transmission delay
  • rate
  • DNS

Questão 187

Questão
In a link layer hosts and router are called
Responda
  • Node
  • Frame
  • Protocol
  • Server

Questão 188

Questão
Link layer encapsulates datagrad in a
Responda
  • Node
  • Frame
  • Protocol
  • Server

Questão 189

Questão
The FDDI protocol is based on
Responda
  • The token ring protocol
  • Transmission control Protocol
  • File Transfer Protocol
  • HTTP

Questão 190

Questão
Registered users may look up all meetings in their agenda in a given interval of time
Responda
  • Querying Meetings
  • User Registration
  • Adding Meetings
  • Deleting Meetings
  • Clearing Meetings

Questão 191

Questão
Dividing the network into smaller portions called
Responda
  • Subnet
  • Subnet Mask
  • Bits
  • IP

Questão 192

Questão
Identify the incorrect statement
Responda
  • FTP sends its control information in-band
  • FTP stands for File Transfer Protocol
  • FTP uses two parallel TCP connections
  • FTP sends exactly one file over the data connection

Questão 193

Questão
Find the FTP reply whose message is wrongly matched
Responda
  • 331 – Username OK, password required
  • 425 – Can’t open data connection
  • 452 – Error writing file
  • 452 – Can’t open data connection

Questão 194

Questão
Typically the TCP port used by SMTP is
Responda
  • 25
  • 35
  • 50
  • 15

Questão 195

Questão
The entire hostname has a maximum of ___characters
Responda
  • 255
  • 127
  • 63
  • 21

Questão 196

Questão
Which one of the following allows a user at one site to establish a connection to another site and then pass keystrokes from local host to remote host?
Responda
  • HTTP
  • FTP
  • Telnet
  • TCP

Questão 197

Questão
All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields).
Responda
  • True
  • False

Questão 198

Questão
Suppose a network manager wanted to query the value of the number of TCP segments received by a host running the Microsoft Windows 2000 operating system in a US-based company. What would be the prefix (leading digits) of the MIB variable that should be queried?
Responda
  • 1.3.6.1.2.1.1
  • запомни надо будет написать

Questão 199

Questão
For public-key certification, PGP uses certification authorities.
Responda
  • True
  • False

Questão 200

Questão
The 802.11 protocol does not implement collision detection because
Responda
  • the adapter would still not be able to detect all collisions due to hidden terminals.
  • it is costly to build wireless hardware that detects collisions.
  • collision detection was found to be useless in wired Ethernet.
  • all of the above

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