Test
Networking
Preguntas del test (200)
1In version field of IPv4 header, when machine is using some other version of IPv4 then datagram is
- ARejected
- BAccepted
- CInterpreted
- DInterpreted incorrectly
2Network layer at source is responsible for creating a packet from data coming from another
- AStation
- BLink
- CNode
- DProtocol
3Header of datagram in IPv4 has
- A0 to 20 bytes
- B20 to 40 bytes
- C20 to 60 bytes
- D20 to 80 bytes
4An IPv4 datagram can encapsulate data from several higher-level protocols such as UDP, ICMP, IGMP and
- ATCP protocols
- BCDM protocols
- CATM protocols
- DIEEE protocols
5To record Internet routers of IPv4, that handles datagram is responsibility of
- ARecord protocol
- BRecord Data
- CRecord Route
- DRecord Header
6Internet has chosen datagram approach to switching in the
- AData Link Layer
- BNetwork Layer
- CPhysical Layer
- DPresentation Layer
7In IPv4 protocol, each datagram is handled
- AIndependently
- BDependently
- CPriority basis
- DSystematically
8CCT stands fo
- AClose Circuit Transmission
- BCongestion Controlled Traffic
- CCongestion Controlled Transmission
- DClose Circuit Traffic
9Communication between a computer and a keyboard involves ______________ transmission
- AAutomatic
- BHalf-duplex
- CFull-duplex
- DSingle direction
10Three or more devices share a link in ________ connection
- AUnipoint
- BMultipoint
- CPoint to point
- DNone
11In asynchronous serial communication the physical layer provide
- Astart and stop signalling
- Bflow control
- Cboth start & stop signalling and flow control
- Dnone
12The physical layer is responsible for
- Aline coding
- Bchannel coding
- Cmodulation
- Dall of the mentioned
13A single channel is shared by multiple signals by
- Aanalog modulation
- Bdigital modulation
- Cmultiplexing
- Dnone
14Wireless transmission can be done via
- Aradio waves
- Bmicrowaves
- Cinfrared
- Dall of the mentioned
15Which is not a application layer protocol?
- AHTTP
- BSMTP
- CFTP
- DTCP
16The packet of information at the application layer is called __________
- APacket
- BMessage
- CSegment
- DFrame
17Which one of the following is an architecture paradigms?
- APeer to peer
- BClient-server
- CHTTP
- DBoth Peer-to-Peer & Client-Server
18Application layer offers _______ service
- AEnd to end
- BProcess to process
- CBoth End to end and Process to process
- DNone of the mentioned
19E-mail is _________
- ALoss-tolerant application
- BBandwidth-sensitive application
- CElastic application
- DNone of the mentioned
20To deliver a message to the correct application program running on a host, the _______ address must be consulted
- AIP
- BMAC
- CPort
- DNone
21Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core
- ATrue
- BFalse
22With ADSL, each subscriber gets more downstream bandwidth than upstream bandwidth
- ATrue
- BFalse
23Two packets A and B are sent in that order through a connection-oriented communication network. They could arrive at the destination:
- Ain any order, after having traversed the same route.
- Bonly in the order A-B, after possibly having traversed different routes.
- Cin any order, after possibly having traversed different routes
- Donly in the order A-B, after having traversed the same route.
24Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination:
- Ain any order, after possibly having traversed
- Bin the order A-B, after having traversed the same route
- Cin any order, after having traversed the same route.
- Din the order A-B, after possibly having traversed different routes
25The Internet received its name in the 1980s because:
- Ait was an interim (temporary) design of what it later became, but the name stuck.
- Bit was meant to be a network internal to the United States Department of Defense.
- Cit consisted of many interconnected networks.
- Dit achieved international scope with the addition of the City University of London.
26All store-and-forward networks are
- Abroadcast networks.
- Bpacket or message switched networks.
- Cconnection-based networks.
- Dconnectionless networks.
27When 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?
- APacket-switched
- BMessage-switched.
- CSpace-switched.
- DCircuit-switched
28The Date: header in the HTTP response message indicates when the object in the response was last modified.
- ATrue
- BFalse
29The process that sends messages into, and receives messages from, the network through a software interface is called a socket.
- ATrue
- BFalse
30The transfer of an html file from one host to another is:
- Aloss-tolerant and time sensitive
- Bloss-intolerant and time sensitive.
- Closs-intolerant and time insensitive.
- Dnone of the above
31A browser will generate header lines as a function of
- Abrowser type and version.
- Buser configuration of browser.whether the browser has a cached version of the requested object.
- Cwhether the browser has a cached version of the requested object.
- Dall of the above
32SMTP is used to:
- Ato transfer messages from one mail server to another
- Bto transfer messages from mail server to a user agent.
- Cto define the format of message headers.
- Dall of the above.
33DNS resource record has Type=MX. Then:
- AValue is the hostname of the DNS server that is authoritative for Name.
- BValue is the IP address of the mail server that has the alias hostname Name.
- CValue is the hostname of the mail server that has the alias hostname Name.
- Dnone of the above.
34Local DNS name servers:
- Acache resource records, but discard them after a period of time that is on the order of a few days
- Bcache resource records and never discard them.
- Cobtain resource records from Web caches.
- Dnever cache resource records
35Consider 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.
- ATrue
- BFalse
36The size of the TCP RcvWindow never changes throughout the duration of the connection
- ATrue
- BFalse
37The TCP segment has a field in its header for RcvWindow
- ATrue
- BFalse
38Suppose 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
- ATrue
- BFalse
39The MSS is the maximum size of a TCP segment including headers
- ATrue
- BFalse
40When a TCP segment arrives to a host, the socket to which the segment is directed depends on
- Athe source IP address of the datagram that encapsulated the segment
- Bthe destination port numbe
- Cthe source port number
- Dall of the above
41UDP has which of the following characteristics
- Aregulated send rate
- Bconnection state at the server
- Cthree-way hand shake for connection establishment
- Dnone of the above
42When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses
- Athe source port number
- Bthe source IP address
- Cthe destination port number
- Dall of the above
43The stop-and-wait protocol is highly inefficient when there is a
- Alarge distance between source and destination and the transmission rate is low
- Bshort distance between source and destination and the transmission rate is high
- Clarge distance between source and destination and the transmission rate is high
- Dshort distance between source and destination and the transmission rate is low
44Pipelining requires which of the following
- Atransmitting many packets before receiving acknowledgements
- Bunique sequence numbers for each in-transit packet
- Csender-side buffering of unacknowledged packets
- Dall of the above
45Suppose 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
- A404 Not Foun
- B200 OK
- C304 Not Modified
- Dnone of the above
46Streams are not needed in which of the following programs
- ATCPserver
- BUDPserver
- CTCPclient
- DUDPclient
47For BitTorrent, which of the following is true
- AAlthough 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.
- BAt a given instant of time, a peer A may upload to a peer B, even if peer B is not sending anything to A.
- CAmong the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
- DAll of the above
48Consider the latency model for dynamic congestion windows. Which of the following components contribute to latency?
- Athe sum of all the stalled times
- Bround trip time, RTT
- Cthe transmission time of the object, O/R
- Dall of the above
49TCP applies fast retransmit to a segment when
- Ait estimates unusually large RTTs
- Bit receives three ACKs for an earlier segment
- Cthe segment's timer expires
- Dnone of the above
50Nmap is often used to
- Ado port scans over a range of ports at a target host
- Bmeasure throughput between hosts
- Cmeasure round-trip times between hosts
- Ddecipher encrypted traffic
51With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with
- Aan initial sequence number that is a hash of the IP addresses and port numbers in the SYN segment (as well as of other things)
- Binitial sequence number 1
- Ca randomly chosen initial sequence number
- Dnone of the above
52Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination
- ATrue
- BFalse
53The primary role of a router is to forward datagrams from input links to output links
- ATrue
- BFalse
54A forwarding table is
- AUsed to find the proper interface to which the input interface should forward a packet
- BConfigured using a centralized routing algorithm
- CConfigured through routing protocol messages received by router
- DA and C
- EB and C
55How are routing paths calculated?
- AThe full route is mapped out in the datagram’s header.
- BPaths are calculated by routing algorithms.
- CDatagrams always flow on the same path and don’t need to be calculated.
- DThe path is calculated based on available network bandwidth
56 A channel partitioning protocol has which of the following characteristics forwarding table is
- Ait does not generate collisions.
- Ball transmitting nodes get the same amount of bandwidth.
- Cthere is no master node.
- Dall of the above
57Match the following network service to the correct definition
- AGuaranteed Delivery - Guarantees a packet will arrive at its destination
- BGuaranteed Delivery with Bounded Delay- Guarantees delivery within a specified host-to-host delay bound
- CGuaranteed 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. - DЯ НЕ ЗНАЮ КАК ДОБАВИТЬ DROP DOWN ВОПРОС ПОЭТОМУ ПРОСТО ЗАПОМНИ ORDER
58 An ARP query packet is encapsulated in an IP datagram.
- Aa link-layer frame addressed to a specific adapter.
- Ba link-layer broadcast frame.
- Cnone of the above
59Ethernet provides which of the following services to the network layer
error detection- Aerror detection
- Bflow control
- Creliable data transfer
- Dall of the above
60For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter
- Ait discards the frame without sending an error message to the network layer.
- Bit discards the frame and sends an error message to the network layer.
- Cit sends a NACK (not acknowledged frame) to the sending host.
- Dit delivers the frame to the network layer, and lets the network layer decide what to do
61A beacon frame sent by an AP includes
- Athe AP's SSID.
- Bthe AP's MAC address.
- Cboth the AP's MAC address and SSID.
- Dnone of the above
62Packets sent by two stations in 802.11 can collide because
- Aat a given time, the random backoff values of the two stations are the same.
- Bthe packets are sent to different APs but on the same channel.
- Cthe two stations could be hidden from each other.
- Dall of the above
63An 802.11 frame includes
- Aan acknowledgement field.
- Ba sequence number field.
- Cfour address fields.
- Dall of the above
64Which of the following statements best describes the purpose of the SNMP protocol?
- AThe SNMP protocol specifies the actions a network manager should take in response to a specific set of network fault conditions.
- BThe SNMP protocol is a tool for gathering data about network conditions and executing remote actions at remote managed devices.
- CThe 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
65 What is the purpose of the SNMP SetRequest message?
- ATo allow a managed device to request and receive a set of initial values for MIB objects in the managed device.
- BTo allow a managing entity to query the value of a set of MIB object values in a managed device.
- CTo allow a managing entity to set the value of one or more MIB objects in a managed device
66What is the purpose of a presentation service?
- ATo allow a client to inform a server that it (the client) is present and ready to receive data.
- BTo encode, transmit, and translate data from one machine-specific format to another.
- CTo display data in a format specified by a user.
- DNone of the above
67Filtering in a firewall can be based on:
- Asource and destination IP addresses
- BTCP ACK bits
- Csource and destination port numbers
- Dall of the above
68How we call the link-layer packets?
- AFrames
- BPackets
- CDatagrams
- DSegment
- EMessage
69What is the segment?
- Aapplication-layer packet
- Bnetwork-layer packet
- Cdata-link-layer packet
- Dtransport-layer packet
- Ephysical-layer packet
70Most 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
- AQueuing delays
- BStore-and-forward
- CReliable data
- DDatagram
71The housing a large number of hosts, is often used to create a powerful virtual server
- ASupercomputer
- BData center
- CServer house
- DHost center
72Match the following delays to the correct definition
- AProcessing delay
The time required to examine the packet’s header and determine where to direct the packet - BQueuing delay
Packet waits to be transmitted onto the link - CTransmission delay
This is the amount of time required to push all of the packet’s bits into the link - DPropagation delay
Once a bit is pushed into the link, it needs to be spread to router - Eпросто запомни ))))
- AProcessing delay
73________________ is a repository of information linked together from points all over the world
- AWWW
- BHTTP
- CHTML
- DNone
74In a URL, the _______ is the full name of the file where the information is located
- APath
- BProtocol
- CHost
- DNone
75A cookie is made by the ________ and eaten by the _______
- AClient; client
- BClient; sever
- CSever; server
- DNone
76In HTTP, the first line in a request message is called a _______ line; the first line in the response message is called the ________ line
- ARequest; response
- BResponse; request
- CResponse; status
- DHeader line; request
- ENone
77DNS provides a few other important service in addition to translating hostnames to IP addresses
- AHost aliasing
- BDelaying the packets
- CCongestion control
- DLoad distribution
- EMail server aliasing
78Small piece of data sent from a website and stored in the user's web browser while the user is browsing
- AWeb cache
- BSet-cookies
- CCookies
- DStatus line
79A network entity that satisfies HTTP requests on the behalf of an origin Web server
- AWeb browser
- BClient
- CRoot servers
- DData center
- EProxy server
- FDNS servers
80How many ports can be per IP address
- A65,535
- B68,535
- C65,335
- D64,535
- E60,535
81FTP is built on _____ architecture
- AClient-server
- BP2P
- CBoth of the mentioned
- DNone
82FTP uses _____ parallel TCP connections to transfer a file
- A1
- B2
- C3
- D4
83If 5 files are transfered from server A to client B in the same session. The number of TCP connection between A and B is
- A5
- B10
- C2
- D6
84The password is sent to the server using _____ command
- APASSWD
- BPASS
- CPASSWORD
- DNone
85Time it takes for a small packet to travel from client to server and then back to the client
- ARIP
- BRDT
- CARP
- DTTL
- ERTT
86____________is a physical-layer device that acts on individual bits rather than frames
- AA hub
- BA host
- CSwitch
- DRouter
87Define to which level of the network protocols are belong to
- AIMAP,POP3, DNS, FTP, Telnet-Application layer
- BTCP, UDP-Transport layer
- CICMP, RIP, IPv4, IPv6-Network layer
- DARP, ATM, Token ring-Data Link layer
- EBluetooth, 802.11-Physical layer
- FПРОСТО ЗАПОМНИ ВСЕ
88___________algorithm computes the least-cost path between a source and destination using complete, global knowledge about the network
- AVirtual circuit
- BA global routing
- CForwarding
- DNone
89Computer networks that provide only a connection service at the network layer are called
- ADatagram network
- BVirtual-circuit networks
- CNetwork
- DNone
90Each 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
- AVirtual-circuit networks
- BNetwork
- CDatagram network
- DNone
91Determine the correct class of the following IP address: 93.44.123.184
- AA
- BB
- CC
- DD
- EE
92Determine the correct class of the following IP address: 160.23.244.224
- AA
- BB
- CC
- DD
- EE
93 Convert the following IP address: 192.224.224.15 to the binary
- A11000000. 11100000. 11100000. 00001111
- B11001100.11000111.11100011. 00001111
- C01010110. 01111011. 00000001. 00000001
- D11000100. 00000101. 01111011. 11011101
94Convert the following IP address: 93.44.123.184 to the binary
- A11001100.11000111.11100011. 00001111
- B01010110. 01111011. 00000001. 00000001
- C11000100. 00000101. 01111011. 11011101
- D01011101. 00101100. 01111011. 10111000
95 Convert the following IP address: 158.0.147.85 to the binary
- A11001100.11000111.11100011. 00001111
- B01010110. 01111011. 00000001. 00000001
- C10011110. 00000000. 10010011. 01010101
- D11000100. 00000101. 01111011. 11011101
96set 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
- AApplication Programming Interface (API)
- BDNS domain name system
- CInternet transport-layer protocol (TCP or UDP)
- DEncapsulation
97Below provided a typical HTTP response message. Let’s take a careful look at this response message
What three sections has HTTP response message?
- AWhat three sections has HTTP response message?
- Bheader lines, entity body, and then the URL structure.
- Can initial status line, entity body, conclusion.
- Dan initial status line, six header lines, and then the entity body.
- Eheader lines, entity body, and then the response
98Below 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.
- Athe information about receiver
- Bthe status line indicates that the server is using HTTP/1.1 and that everything is OK
- Cthe information about all the destination of packet
- Dthe requested object itself (represented by data data data data data)
99Below 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.- AIn this example, the status line.
- Bhas the information about receiver
- Chas the requested object itself (represented by data data data data data …)
- Dhas the information about all the destination of packet
- Eindicates that the server is using HTTP/1.1 and that everything is OK
100 How does an operating system identify the application to which data coming in from the network should be relayed
- ABy the protocol with which the data was sent
- BOnly one application at a time is given access to the network.
- CBy the port number carried by the transport protocol
- DBy the file extension of the data
101 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
- AI and III only
- BII only
- Cnone
- DI only
102Which of the following protocols are essential to the existence of the Traceroute tool? 1 IP, 2 ICMP, 3 TCP
- AI and III only
- BII only
- CII and III only
- DI only
103A difference between routers and switches is that
- Aswitches connect only to hosts, whereas routers connect networks
- Bswitches hold IP routing tables only for only local subnets
- Crouters parse, process, and modify IP headers
- Drouters perform the same function as switches but the two are marketed in very different way
104At which of the following layers of the OSI protocol stack can the Internet Control Message Protocol be implement. 1Network, 2transport, 3Data link
- AI or II
- BI only
- CII only
- DIII only
105How to understand the connection-oriented protocol?
- Ameans that before the client and server can start to send data to each other, they first need to handshake and establish a TCP connection
- Bmeans that provide an application with one or more security services can also provide timing guarantees
- Coffers a different set of services to the invoking applications
106Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core
- AVerdadero
- BFalso
107Twisted-pair cooper wire is no longer present in computer networks
- AVerdadero
- BFalso
108Two packets A and B are sent in that order through a connectionless communication network. They will arrive at the destination
- Ain any order, after possibly having traversed different routes.
- Bin the order A-B, after having traversed the same route.
- Cin any order, after having traversed the same route.
- Din the order A-B, after possibly having traversed different routes
109Compared to the wired transmission, wireless transmission typically has _____ attenuation and _____ maximum distance
- Ahigher, longer
- Blower, shorter
- Clower, longer
- Dhigher, shorter
110Which of the following features of Ethernet has not remained constant since the advent of the technology?
- AProtocol header format
- BProtocol addressing
- CUse of CSMA-CD control
- DTransmission bandwidth
111Which of the following internet applications typically transmit(s) packets over Transmission Control Protocol (TCP)? I.FTP client II.Audio streaming III.Web browser
- AI, II, and III
- BII only
- CI and II only
- DI and III only
112 In order to maintain network stability while Transmission Control Protocol (TCP) probes for additional bandwidth, rate increases are _____, and rate decreases are _____
- Amultiplicative, additive
- Badditive, additive
- Cmultiplicative, multiplicative
- Dadditive, multiplicative
113Network clients use well-known _____ numbers to contact well-defined network services, such as Telnet and DNS servers
- Aaccept
- Bconnect
- Clisten
- Dport
114Multicast communication generally refers to data that is
- Asent from several hosts to one host simultaneously
- Brelayed through multiple routers
- Crelayed through multiple bridges
- Dsent from one host to several hosts simultaneously
115The Internet Protocol (IP) defines the _____ layer of the Internet protocol stack
- Aapplication
- Btransport
- Cphysical
- Dnetwork
116The term packetization refers to the process of
- Areassembling network packets for consumption by an application
- Busing a digital instead of an analog transmission medium
- Cusing an analog instead of a digital transmission medium
- Dsplitting a message into fragments for network transmission
117Which 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
- AII only
- BI and II
- CNone
- DI only
118Which of the following is a protocol used for communication between a web server and a web browser?
- AFTP
- BTelnet
- CWorld Wide Web (www)
- DHTTP
119Which of the following is a disadvantage of connection-based protocols?
- AUnreliable connections
- BHigh error rates
- CSmall MTU sizes
- DHigh startup costs
120On a network, the term authentication typically refers to the process of
- Aensuring that users remain anonymous
- Bensuring that packets sent through the Internet cannot be intercepted
- Ccomputing the checksum of packets
- Dverifying the identity of a sender or receiver
121 Which of the following is the network-layer protocol of the Internet?
- AHTTP
- BTelnet
- CEthernet
- DIP
122Which of the following was designed to solve the problem of IP address space fragmentation?
- AMaximum Transfer Unit
- BSimple Network Management Protocol
- CPeering
- DClassless Inter Domain Routing
123Which of the following IP header fields provide simple error detection?
- AFragmentation
- BTime to live
- CType of service
- DChecksum
124Which of the following maps IP addresses onto datalink addresses?
- ADomain Name System (DNS)
- BSimple Network Management Protocol (SNMP)
- CClassless Inter Domain Routing (CIDR)
- DAddress Resolution Protocol (ARP)
125Consider 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?
- AAn ARP lookup
- BThe packet is sent to the first router.
- CHost cs.cmu.edu performs an SNMP server query.
- DA DNS lookup
126Which of the following can be used by a router to report a dropped packet to the packet's sender?
- ASimple Network Management Protocol (SNMP)
- BBorder Gateway Protocol (BGP)
- CDynamic Host Configuration Protocol (DHCP)
- DInternet Control Message Protocol (ICMP)
127Which of the following IP header fields is designed to prevent a packet from remaining indefinitely in a routing loop?
- AChecksum
- BLength
- CFragmentation
- DTime to live
128 Which of the following allows a host to be assigned an IP address automatically?
- AThe simple network management protocol (SNMP)
- BThe domain name system (DNS)
- CThe address resolution protocol (ARP)
- DThe dynamic host configuration protocol (DHCP)
129Which of the following network exploration tools can be used to determine information about possible paths between one network host and another?
- APing
- BNetstat
- CNslookup
- DTraceroute
130The time required to examine the packet's header and determine where to direct the packet is part of the
- AProcessing delay
- BQueuing delay
- CTransmission delay
- DPropagation delay
131How we call the delay, when packet waits to be transmitted onto the link
- AProcessing delay
- BQueuing delay
- CTransmission delay
- DPropagation delay
132This is the amount of time required to push all of the packet's bits into the link
- AProcessing delay
- BQueuing delay
- CTransmission delay
- DPropagation delay
133The protocols of the various layers are called ___________
- Aprotocol stack
- Bprotocol layers
- Cprotocol group
- Dprotocol models
134 Which of the following OSI layers converts the ones and zeroes to electrical signals and places these signals on the cable?
- APhysical layer
- BTransport layer
- CNetwork layer
- DApplication laye
135Which of the following is most likely to be a MAC address assigned to a NIC?
- A192.168.1.121
- B24.17.232.75
- C23.4F.17.8A.4C.10
- D713.555.1212
136Which layer of the TCP/IP model involves routing?
- APhysical layer
- BTransport layer
- CApplication layer
- DNetwork layer
137How much data can a typical frame contain?
- A500 bytes
- B1500 bytes
- C1500 bits
- D1 megabyte
138Which of the following best describes an IP address?
- AA unique dotted decimal notation burned into every NIC
- BA unique 48-bit identifying number burned into every NIC
- CA dotted decimal notation assigned to a NIC by software
- DA 48-bit identifying number assigned to a NIC by software
139Andalyn 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?
- AOnly Andalyn is correct.
- BOnly Buster is correct.
- COnly Carlos is correct.
- DNo one is correct
140Host 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
- AVerdadero
- BFalso
141A channel partitioning protocol has which of the following characteristics
- Athere is no master node
- Bit does not generate collisions
- Call transmitting nodes get the same amount of bandwidth
- Dall of the above
142Ethernet provides which of the following services to the network layer
- Aflow control
- Berror detection
- Creliable data transferreliable data transfer
- Dall of the above
143Each LAN adapter has a unique LAN address
- AVerdadero
- BFalso
144A channel partitioning has which of the following characteristics
- Athere is no master node
- Bit does not generate collisions
- Ctransmitting nodes get the same amount of bandwidth
- Dall
145IEEE standard ethernet CSMA/CD provides which of the following services to the network layer?
- Areliable data transfer
- Berror detection
- Cerror correction
- Dall
146Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination
- AVerdadero
- BFalso
147The Session layer communicates with which other layers
- AApplication and Transport
- BTransport and Network
- CTransport and Presentation
- DTransport, Presentation and Network
148application layer data is
- Amessage
- Bframe
- Cdatagram
- Ddata
- Esegment
149Transport layer data is
- Amessage
- Bframe
- Cdata
- Ddatagram
- Esegment
150Network layer data is
- Amessage
- Bframe
- Cdatagram
- Dsegment
- Edata
151Link layer data is
- Amessage
- Bframe
- Cdatagram
- Ddata
- Esegment
152HTTP persistent connection - multiple objects can be sent over single TCP connection between client, server
- AVerdadero
- BFalso
153HTTP non- persistent connection - multiple objects can be sent over single TCP connection between client, server
- AVerdadero
- BFalso
154SMTP is used to
- Ato transfer messages from one mail server to another
- Bto transfer messages from one mail server to another user agent
- Cto define the format of message headers
- Dto transfer messages from one user to another
155The transmission of high-quality, interactive voice and video over the current Internet is difficult because today's Internet
- Adoes not really have sufficient throughput
- Bgives higher priority to bulk data transfers
- Cuses connectionless protocols
- Dis unable to guarantee minimum throughput or maximum latency for a given connection
156The 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?
- AB is smaller than A
- BA is smaller than B
- CB is equal to A
- DB and A are not related
157Ethernet (IEEE 802.3) is an example of
- Aa standard developed by the International Telecommunications Union
- Ba successful example of the Internet's strategy of developing standards through "rough consensus and running code"
- Ca de facto standard later developed into a de jure standard
- Dan a priori standard
158 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?
- Acannot be determined from the information given
- B55 milliseconds
- C40 milliseconds
- D76 milliseconds
159When the data link layer applies "framing" to the data to be transmitted, it
- Acuts out the headers from higher layer protocols before transmission
- Badds the protocol headers from higher layers to the data before it transmits it
- Cinserts flags to draw attention to high-priority data within a transmission
- Denhances it with extra data that permits the receiver to synchronize with the sender
160In a broadcast-based network, longer propagation delays
- Adestroy the carrier, making it impossible to sense it before transmitting
- Bmake it all the more critical to sense the carrier before transmitting
- Csignificantly decrease the benefit of sensing the carrier before transmitting
- Ddo not affect the cost-benefit trade-off of carrier sensing
161What is the type of an "8+1" parity code that outputs 100101011?
- AOdd Parity
- BNull Parity
- CCannot tell since we do not know which bit is the parity bit
- DEven Parity
162A specific CSMA-CD network such as 10-BASET "Ethernet
- Ahas higher cost per node as nodes are added
- Bcan connect very distant node
- Cworks best for an even number of nodes
- Dsuffers performance degradation as nodes are added
163A 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?
- AA small 10 Base-T switch to connect the existing hub
- BReplace the hubs with 100 Base-T hub
- CA new bank of dial-up modems
- DReplace the hubs with 10 Base-T switches
164A sender's data link layer uses "bit stuffing" to
- Aforce the receiver to enlarge its flow control window
- Bavoid confusing data bits with control bits
- Cpad the data so that it has an even length for parity calculations
- Dmark the start and the end of a frame
165The Internet Protocol (IP) is used in the network layer of the Internet. Which service does IP provide to the transport layer?
- AConnectionless service via virtual circuits
- BConnectionless service via datagrams
- CConnection-oriented service via datagrams
- DConnection-oriented service via virtual circuits
166A 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?
- ATCP
- BSNMP
- CPLM
- DICMP
167A 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?
- A4
- B5
- C1
- D2
168The 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?
- AThe new network card does not work.
- BYour desktop computer is still trying to contact the server's old network card.
- CYour desktop computer's network card does not work.
- DThe Domain Name System (DNS) has not yet updated its entry for the Web server.
169In 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- Adeveloped in secret by the members of the IETF until the standards mature sufficiently to withstand public criticism
- Bmodified arbitrarily by the Advance Research projects Agency (ARPA) of the United States Department of Defense, which originally developed the Internet
- Capplied before they have been embodied in working implementations, in order not to delay progress
- Dextensively critiqued and modified by individuals, without requiring them to have special membership status
170there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive
- Ae-mail
- Breal time audio/video
- Ctext messaging
- Dgames
171there are transport service requirements, for which of the following applications these requirements are demanded: no data loss, elastic throughput, and not time sensitive
- Aweb documents
- Breal time audio/video
- Ctext messaging
- Dgames
172reliable transport between sending and receiving process refers to (protocol type)?
- ATCP
- BTransport control protocol
- CTCP service
- DВы должны будете написать это поэтому запомните хоть один вариант
173TP client contacts FTP server at port ______, using TCP
- A21
- Btwenty one
- CЗапомни (хоть один вариант) так как тебе нужно будет это написать
174331 Username OK, password required – status code refers to (protocol type)?
- AЗапомни (хоть один вариант) так как тебе нужно будет это написать
- BFTP
- CFile transport protocol
175e-mails use ______________ protocol for sending messages
- ASMTP
- BFTP
- CHTTP
- DMIME
176IMAP stands for
- AInternet Mail Access protocol
- BЗапомни тебе надо это написать
177POP stands for
- AЗапомни тебе надо это написать
- Bpost office protocol
178Which of the following statements are true about the TCP service model?
- ATCP uses a checksum to determine if the application data follows the right syntax
- BTCP delivers a stream of bytes from one end to the other, reliably and in-sequence, on behalf of an application
- CBecause TCP encodes data with enough information to correct errors, it never needs to retransmit missing segments
- DBecause TCP cannot trust the IP layer to format packets correctly, it must include the destination IP address in the TCP header
- ETCP is responsible for providing reliable, in-sequence end-to-end delivery of data between applications.
179Which of the following are direct consequences of this design choice?
- ATCP 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
- BTCP 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
- CTCP can only work correctly if the layer below it also delivers data reliably and in sequence
- DTCP requires no connection state to be established prior to the end points communicating
180The _______ layer lies between the network layer and the application layer.
- Aphysical
- Bdata link
- Ctransport
- Dnone
181Which of the following is an application layer service?
- Aremote log-in
- Bmail service
- Cfile transfer and access
- Dall
182The_________ layer is responsible for the delivery of a message from one process to another
- Aphysical
- Bdata link
- Ctransport
- Dnetwork
183The Internetworking Protocol (IP) is a ________ protocol
- Areliable
- Bconnectionless
- Cconnection oriented
- Dnone
184____ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer
- ATCP
- BUDP
- CIP
- DHTTP
185__________provides full transport layer services to applications
- ATCP
- BUDP
- CIP
- DHTTP
186Translation of a domain name into an address called
- Aname resolution
- Btime needed to transmit L-bit packet into link = L (bits) / R (bits/sec)
- Cbandwidth
- Dpacket transmission delay
- Erate
- FDNS
187In a link layer hosts and router are called
- ANode
- BFrame
- CProtocol
- DServer
188Link layer encapsulates datagrad in a
- ANode
- BFrame
- CProtocol
- DServer
189The FDDI protocol is based on
- AThe token ring protocol
- BTransmission control Protocol
- CFile Transfer Protocol
- DHTTP
190Registered users may look up all meetings in their agenda in a given interval of time
- AQuerying Meetings
- BUser Registration
- CAdding Meetings
- DDeleting Meetings
- EClearing Meetings
191Dividing the network into smaller portions called
- ASubnet
- BSubnet Mask
- CBits
- DIP
192 Identify the incorrect statement
- AFTP sends its control information in-band
- BFTP stands for File Transfer Protocol
- CFTP uses two parallel TCP connections
- DFTP sends exactly one file over the data connection
193Find the FTP reply whose message is wrongly matched
- A331 – Username OK, password required
- B425 – Can’t open data connection
- C452 – Error writing file
- D452 – Can’t open data connection
194Typically the TCP port used by SMTP is
- A25
- B35
- C50
- D15
195The entire hostname has a maximum of ___characters
- A255
- B127
- C63
- D21
196Which 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?
- AHTTP
- BFTP
- CTelnet
- DTCP
197All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields).
- AVerdadero
- BFalso
198Suppose 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?
- A1.3.6.1.2.1.1
- Bзапомни надо будет написать
199For public-key certification, PGP uses certification authorities.
- AVerdadero
- BFalso
200The 802.11 protocol does not implement collision detection because
- Athe adapter would still not be able to detect all collisions due to hidden terminals.
- Bit is costly to build wireless hardware that detects collisions.
- Ccollision detection was found to be useless in wired Ethernet.
- Dall of the above
Información
- Descripción
- Networking
- Autor
- Altynay Toiguliyeva
- Idioma
- English
- Visitas
- 1.251
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test