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Netzwerktechnik 2
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Perguntas do quiz (82)
1The types of IP forwarding are: ?
- ADirect IP forwarding
- BIndirect IP forwarding: Routing
- CRe-Direct IP forwarding
- DMulti Re-Direct Routing
2Does routing protocols change a static route entry?
- AYes
- BNo
- CYes, if the next hop is known
- DYes, if the next router is known
3Which types of mappings are found in a routing table?
- AThe direct routes
- BThe indirect routes
- CThe default routes
- DThe mandatory routes
- EThe re-direct routes
4Which routing protocol does you know?
- ARouting Information protocol (RIP)
- BOpen Shortest Path First (OSPF)
- CBorder Gateway Protocol (BGP)
- DMedia Access Protocol (MAP)
- ETable Information Protocol (TIP)
5Consider the following IPv4 address structure and answer the following questions. Check all that apply.
[1,0][Network 14 bits][Host 16 Bits]- AClass A address
- BClass B address
- CMultcast address
- DA possible network address is 200.201.0.0
- EA possible network address is 130.131.0.0
- FA possible network address is 130.131.255.255
6Consider the following IP address structure and answer the following questions. Check all that appply
[1,0][Network 14 bits][ host 16 bits]- AThis network may have up to 255 hosts.
- BThis network may have up to 65 533 hosts.
- CThis network may have up to about 16 mio. hosts.
- DAs a standard classful network, the standard subnet mask is 255.0.0.0
- EAs a standard classful network, the standard subnet mask is 255.255.0.0
- FAs a standard classful network, its individual subnet mask could be 255.255.192.0
7All ones addresses
- ALocal Loopback Address
- BBroadcast Address
- CHost in a network
- DNetwork itself
8All zeros network number
- ALocal Loopback Address
- BBroadcast Address
- CHost in a network
- DNetwork itself
9All zeros number
- ALocal Loopback Address
- BBroadcast Address
- CHost in a Network
- DNetwork itself
10All ones host number
- ALocal Loopback Address
- BBroadcast Address
- CHost in a network
- DNetwork itself
11All zeros host number
- ALocal Loopback Address
- BBroadcast Address
- CHost in a network
- DNetwork itself
12Which facts hold for loopback addresses? Check all that applies.
- ADoes not access the physical network
- B127.0.0.1 is a loopback address
- CIt is a broadcast address to all hosts in the network
- DIt is defined as the "Localhost"
- EIt is reserved for link-local addressing
13Which facts hold for private IPv4 addresses? Check all that applies.
- ADoes not access the physical network
- BCan be applied to isolated hosts not directly accessible from internet
- CThere are 5 IP address ranges defined for private IP addresses
- D10.0.0.253 is a private IP network address
- E10.0.0.254 is a private IP host address
14Which facts hold for private IPv4 addresses? Check all that applies.
- A127.0.0.0 is a private IP network address
- B192.168.0.0 is a private IP network address
- CCan be translated into globally routable IPv4 addresses by FAT
- DCan be translated into globally routable IPv4 addresses by PAT
- ECan be translated into globally routable IPv4 addresses by NAT
15How many bits are included in an IPv6 address?
- A64 bits
- B128 bits
16What are 3 types of IPv& addresses?
- Aglobal unicast
- Bunique-local unicast
- Clink-local unicast
17Which properties relate to the Internet Protocol? Check all that apply.
- AReliable
- BConnectionless
- CBest effort
- DLayer 4
- EPacket delivery protocol
18Which properties relate to the IPv4 datagram? Check all that apply.
- AConsists of IP header and IP payload
- BIP header carries protocol control information
- CIP payload carries data of lower layer protocols
- DIP datagram is further encapsulated into higher layer frame
- EIP datagram is further encapsulated into lower layer frame
19Which length in bytes has the default IP header?
- A20 Bytes
- B20 bits
- C40 Bytes
- D40 bits
20Which facts hold for the (standard) IPv4 header fields? Check all that apply.
- AContains Version field
- BHeader length field has a size of 1 byte
- CTotal length field is 16 bit long
- DIdentification field is used for reliable packet delivery
- Eflag bits are "0", "DF", "MF"
- FTTL specifies the time a packet already travels across the internet
- GTTL maximum number is 65 535
21Which facts hold for the (standard) IPv4 header fields? Check all that apply.
- ATotal length of the IP payload is maximum 65 535 bytes
- BProtocol field defines the underlying layer 1 and 2 protocols used for transmission
- CFragment offset is counted in bytes
- DSource IP address is 4 bytes long
- EDestination IP address is 32 bit long
- FPadding is required to obtain a minimum IP header length of 20 bytes
- GHeader checksum has to be recalculated at each router
22Check all aspects that apply to the Address Resolution Protocol ARP:
- AIt finds a required hardware address to a given protocol address
- BIt finds a required IP address to a given MAC address
- CHosts use an ARP cache to store e.g. MAC addresses to corresponding IP addresses
- DARP is a true layer 3 protocol
- EARP can only correlate IP addresses to Ethernet addresses
23Check all aspects that apply to the Address Resolution Protocol ARP:
- AARP requests are sent as MAC (Layer 1/2) broadcasts
- BARP replies are sent as MAC (Layer 1/2) broadcasts
- CARP requests have to be checked by all NICs within the network
- DARP replies have to be checked by all NICs within the network
- EAs an answer to an ARP request, all hosts in the network send back
24Check all aspects that apply to the Address Resolution Protocol ARP:
- AARP replies contain also the required IP address
- BARP messages are sent as IP datagrams
- CARP requests are sent as ICMP messages
- DARP messages are identified by a certain number in Type Field of the MAC (Ethernet) frame
- E"Ping" is an ARP command
25Check all aspects that apply to the Internet Control Message Protocol ICMP:
- AICMP uses the ARP protocol
- BICMP is a Layer 2 protocol
- CICMP is used for transferring messages from routers
- DICMP uses IP
- EICMP uses TCP
26Check all aspects that apply to the Internet Control Message Protocol ICMP:
- AICMP is used to find IP addresses to given MAC addresses
- BICMP messages do not need the IP header
- C"Ping" is a typical ICMP application
- D"Pong" is a typical ICMP application
- E"Traceroute/Tracert" is a typical ICMP application
27Which statements are correct? Check all that apply.
- ABOOTP is layer 7 protocol
- BDHCP uses TCP
- CDHCP is a "Layer 2.5" protocol
- DDHCP is a layer 7 protocol
- EDHCP uses port 80
- FDHCP is an extension of BOOTP
28Which statements are correct? Check all that apply.
- ADHCP servers allocate IP addresses and parameters to clients
- BDHCP is a client-server protocol
- CDHCPDISCOVER is sent via IP broadcast
- DDHCPOFFER is sent to the IP address of the client
- EDHCP only allows dynamic IP address configuration
29Which statements about DHCP operation are corret? Check all that apply.
- ADHCP operation starts with DHCPOFFER from the server
- BDHCP operation starts with DHCPOFFER from the client
- CDHCP operation starts with DHCPDISCOVER from the server
- DDHCP operation starts with DHCPDISCOVER from the client
- EAll servers reply DHCPOFFER to a DHCPDISCOVER from a client
- FOnly one server replies DHCPOFFER to a DHCPDISCOVER from a client
- GAfter DHCPDISCOVER, the client immediately sends DHCPREQUEST
30Which statements about DHCP operation are correct? Check all that apply.
- AOn DHCPOFFER from a server the client issues a DHCPREQUEST
- BThe DHCPACK from a server contains the required information for the client
- CA DHCP lease is renewed by a DHCPRENEW request from the client
- DTo renew a DHCP lease, the client has to send DHCPREQUEST
- EA DHCP lease is automatically updated by the server
- FThe server can force the client to drop the lease by sending DHCPRELEASE
- GThe client can return its lease by sending DHCPRELEASE
31Which is the correct complete header order of DHCP packets in Ethernet LANs?
- AEthernet – RARP – BOOTP – DHCP
- BEthernet – RARP – DHCP
- CEthernet – UDP- DHCP
- DEthernet – TCP- DHCP
- EEthernet – IP - UDP- DHCP
- FEthernet – IP – TCP - DHCP
- GUDP – DHCP
32Which statements about the IPv6 header are correct? Check all that apply.
- AThe IPv6 header has a larger number of fields than the IPv4 header
- BThe IPv6 header has a length of 20 bytes
- CThe IPv6 header has a length of 40 bytes
- DThe IPv6 address has a length of 16 bytes
- EThe IPv6 address has a length of 128 bits
- FThe IPv6 header contains a “Fragmentation Offset” field
33Which statements about IPv6 header and packets are correct? Check all that apply.
- AThe IPv6 header has an “Option” field
- BThe IPv6 header contains a “Version” field
- CThe IPv6 header contains a “Header Checksum” field
- DIf necessary, an IPv6 packet can be fragmented by any intermediate router
- EThe default maximum IPv6 payload is 65 535 bytes
- FThe default MTU length at layer 2 is expected to be at least 68 bytes
- GThe IPv6 header contains a 8 bit “Flow Label” field
34Which statements about IPv6 header and packets are correct? Check all that apply.
- AThe “Next Header” field has 8 bit length
- BThe “Next header” field is similar to the “Protocol” field in the IPv4 header
- CThere are only 2 extension headers allowed
- D“Routing Header” is an extension header
- EICMPv6 does not require an IPv6 header
- F“TCP-Header” or “UDP-Header” is always in the first extension header
- G“TCP-Header” or “UDP-Header” is typically the entry of the last extension header
35Which statements about IPv6 address operations are correct? Check all that apply.
- AAn Ethernet NIC is already delivered with a global unique IPv6 address
- BAn Ethernet NIC is already delivered with a global unique layer2 (MAC) address
- CIPv6 addresses may be assigned manually
- DSLAAC can be applied
- EDHCP(v6) is highly recommended
- FSLAAC is a stateful mechanism
- GLink-local addresses are configured automatically
36Which statements about IPv6 and PMTUD are correct? Check all that apply.
- APMTUD is used to avoid fragmentation
- BMTU is the maximum transfer unit in bits at layer 3
- CMTU is the maximum transfer unit in bytes at layer 3
- DMTU is the maximum transfer unit in bits at layer 2
- EMTU is the maximum transfer unit in bytes at layer 2
- FFragmentation can be done by the source host using the “Fragmentation header” y
- GPMTUD can be omitted as long as packets are shorter than 1500 bytes
37Which statements about IPv6 NDP are correct? Check all that apply
- ANDP is used to avoid fragmentation
- BNDP is used for stateless address auto-configuration
- CNDP replaces ARP
- D“Neighbor Solicitation” is the response to “Neighbor Advertisement”
- E“Neighbor Advertisement” is the response to “Neighbor Solicitation”
- F“Neighbor Advertisement” is sent as an ICMPv6 packet
- G“Neighbor Solicitation” is sent to a solicited-node multicast address
38Which statements about SLAAC are correct? Check all that apply
- ASLAAC is a stateless autoconfiguration protocol
- BSLAAC always requires a dedicated server
- CSLAAC is used to find a client’s link local address
- DSLAAC is designed for both routers and clients
- ESLAAC uses special ICMPv6 type messages
39Which statements about SLAAC are correct? Check all that apply.
- A“Router Advertisement” messages are sent by the client in search of a router
- B“Router Advertisement” messages are sent periodically by routers
- C“Router Solicitation” messages are sent by the client in search of a router
- DRouter Solicitation” messages are sent periodically by routers
- E“Prefix Advertisement” and/or “Double Address detection” are typical SLAAC tasks
40Which statements about SLAAC are correct? Check all that apply.
- ASLAAC uses distinct ICMPv6 message types
- B“Router Advertisement” is sent by the router are sent to a solicited multicast destination address, e.g. FF02::1:FF01:B
- C“Router Advertisement” is sent by the router are sent to an all-node multicast destination address, e.g. FF02::1
- D“Router Advertisement” returns the desired network prefix, e.g. 2001:ABCD:EF98:1234::/64
- E“Router Advertisement” are returned by the all-routers multicast destination address FE80::/10
41On which layer according to the ISO/OSI- and/or the TCP-model is UDP located?
- ATransport Layer - 4
- Bnetwork layer 3
42Check all correct answers that apply to UDP:
- AIt is a standard protocol
- BIt is an application interface to IP
- CIt provides error recovery
- DIt provides no guaranteed data delivery
- EIt provides flow control
- FIt provides retransmission
- GIt is stateless
43Check all correct orders of headers and payload, when an application process sends data via UDP, IP and Ethernet (ETH):
- AIP – ETH – UDP – payload
- BIP – UDP – payload
- CETH – IP – UDP – payload
- DETH – UDP – IP – payload
- EETH – UDP – payload
- FETH – IP – UDP – TCP – payload
- GETH – IP – UDP – SNMP – payload
44What is the length of the UDP-Header? Check all correct answer(s):
- A2 bytes
- B16 bits
- C8 bytes
- D64 bits
- E64 bytes
- F512 bits
- Gvariable
45Check all correct answers that apply to the UDP header fields:
- ASource Port, Field Length = 2 Bytes
- BSource Port, Field Length L = 1 Byte
- CSource Port, max. number is 65 535
- DDestination Port, Field Length L = 16 bits
- EDestination Port, max. number is 90 000
- FLength; Field Length = 32 bits
- GChecksum, Field Length = 2 Bytes
46Over which portions is the checksum in the UDP header calculated?
- AUDP header + UDP payload
- BIP header + UDP header + UDP payload
- CPseudo IP header + UDP header
- DPseudo IP header + UDP header + UDP payload
- EEthernet header + Pseudo IP header + UDP header + UDP payload
- FEthernet header + Pseudo IP header + UDP header
- GEthernet header + Pseudo IP header + UDP header + TCP header
47Which fields does the pseudo-IPv4 header contain? Check all answers that apply:
- ASource IP address, destination IP address
- BSource IP address, destination IP address, zero, protocol, UDP length
- CSource IP address, destination IP address, protocol, UDP length, UDP payload
- DUDP source port, UDP destination port, zero, protocol, UDP length
48Which functions does the UDP API consist of? Check all that applies:
- ASend operation, receive operation, creation of new receive ports
- BReceive operation, send operation, connection establishment
- CSend operation, receive operation, flow control
- DReceive operation, send operation, data reordering
49What does the receive operation of the UDP API return? Check all that applies:
- ASource IP address
- BData bytes
- CData sequence number
- DSource port
- EDestination port
- FDestination IP address
50What are the parameters of the send operation of the UDP API? Check all that applies:
- ASource IP address
- BPointer to data bytes
- CData sequence number
- DSource port
- EDestination port
- FDestination IP address
51Which standard applications use UDP? Check all that applies:
- ATFTP
- BFTP
- CLDAP
- DHTTP
- ESNMP
- FEmail (SMTP, POP, IMAP)
- GICMP
- HReal-Time Audio/Video
- IGaming
52Check all correct answers that apply to TCP:
- AIt is a standard protocol
- BIt is an application interface to IP
- CIt provides no error recovery
- DIt provides guaranteed data delivery
- EIt provides flow control
- FIt provides no retransmission
- GIt provides congestion control
- HIt is stateless
53What do have TCP and UDP in common? Check all that apply:
- AThey use port numbers for addressing of services/applications
- BThey provide error recovery
- CThey are connection-oriented protocols
- DThey provide reliability
- EThey are located on layer 4
54Check all correct orders of headers and payload, when an application process sends data via TCP, IP and Ethernet (ETH):
- AIP – ETH – TCP – payload
- BIP – TCP – payload
- CETH – IP – TCP – payload
- DETH – IP - TCP – HTTP – payload
- EETH – TCP – payload
- FIP –TCP – HTTP - payload
- GETH – IP – TCP – FTP – payload
55What does stream data transfer mean in the context of TCP? Check all that apply:
- ATCP sends data continuously without any intervals
- BThe application process has to chop the data in adequate blocks before sending via TCP
- CTCP itself decides how to chop user data into TCP segments
56What does the sequence number in each TCP segment refer to? Check all that apply:
- ANumber of transmitted segment
- BNumber of bytes transmitted in the current TCP segment
- CNumber of first byte in the TCP payload
- DThe TCP software at the destination host can use the sequence number to rearrange the received segments in case they arrive out of order
- EThe TCP software at the destination host can detect missing segments according to the sequence number
5720. What aspects are connected to reliability of TCP? Check all that apply:
- ATCP assigns a sequence number to each segment
- Bb. TCP software at the source expects a positive acknowledgement ACK from the receiver
- CTCP controls IP to send data only via reliable channels
- DIf the ACK is not received within a certain timeout interval, the sender TCP module will retransmit the TCP segment
- ETCP cannot eliminate duplicate TCP segments.
58What does the window field indicate sent by host B to the source host A? Check all that apply
- AIt is related to multiplexing of data via ports of A and B
- BIt is primarily related to retransmission from A to B
- CIt prevents overflow in the sender TCP buffer A
- DIt prevents overflow in the receiver TCP buffer B
- EIt indicates to source A the number of segments which receiver buffer B is still capable to receive
- FIt indicates to source A the number of bytes which receiver buffer B is still capable to receive
59How is the multiplexing of application data achieved at the TCP layer? Check all that apply:
- ABy IP addresses
- BBy Ethernet addresses
- CBy different sequence numbers
- DBy different ports
- EBy different window sizes
6023. What is the length of the standard (default) TCP header? Check all that apply:
- Aa. 32 bytes
- Bb. 32 bits
- Cc. 5 bytes
- Dd. 20 bytes
- Ee. 128 bits
- Ff. 512 bits
- Gg. variable
61Which control flags are used in the TCP header? Check all that apply:
- ATTL
- BSEQ
- CACK
- DSYN
- EURG
- FNOP
- GFIN
- Hh. In total 5 flags
- IIn total 6 flags
62What is the maximum number of the source port and destination field in the TCP header?
- A65 535
- B255
63What is (roughly) the maximum sequence number?
- A2^31
- B1024
6427. What is the maximum number in the Data Offset field and what is hence the maximum TCP header size?
- A20 bytes
- B40 bytes
65What is the meaning of an acknowledgement number N in the TCP header? Check all that apply:
- AThe number of correctly received TCP segments
- BAll TCP segments up to number N-1 are received correctly
- CAll bytes up to number N-1 are received correctly
- DThe size of the available receive buffer in bytes
- EThe sequence number of the first byte in the next expected segment
6636. Over which portions is the checksum within the TCP header calculated?
- Aa. TCP header + TCP data
- Bb. IP header + TCP header + TCP data
- Cc. Pseudo IP header + TCP header
- Dd. Pseudo IP header + TCP header + TCP data
- Ee. Ethernet header + Pseudo IP header + TCP header + TCP data
- Ff. Ethernet header + Pseudo IP header + TCP header
67Which standard applications use TCP? Check all that applies:
- ATFTP
- BFTP
- CLDAP
- DHTTP
- EHTTPS
- FARP
- GEmail (SMTP, POP, IMAP)
68How is the application process addressed? Check all that applies:
- AUDP segment number
- BIP identification number
- CProcess identification number, ports number and sockets
692. List at least 3 internet applications and their corresponding port numbers.
- AHTTP - 80
- BTelnet - 23
- CSMTP - 25
- DSSH - 22
- EDNS - 53
- FIMAP - 220
70Which statements on port numbers are correct? Check all that applies:
- ATCP/IP port numbers are 32 bit numbers
- BTCP/IP port numbers are 2 byte numbers
- CA HTTP-client uses port number 80
- DA HTTP-client may use port number 8000
- EA HTTP-client may use port number 80 000
- FThe default HTTP server port number is 80
71
Which statements on well-known and ephemeral ports are correct? Check all that applies:- A80 is a well-known port number
- B1000 is an ephemeral port number
- CWell-known ports are uniquely assigned by IANA to certain application layer services at servers
- DRegistered port numbers can be used by internet clients
- EClient processes must use well-known ports
725. Which statements on sockets are correct? Check all that applies:
- AEach side of a TCP connection has a socket which can be identified by the following triple
< TCP, TCP segment number, IP address > - BEach side of a TCP connection has a socket which can be identified by the following triple
< Port number, TCP segment number, IP address > - CEach side of a TCP connection has a socket which can be identified by the following triple
< TCP, IP address, port number > - DA logical TCP connection between a server and client is identified by
< TCP segment number, local IP address, local port, ACK number, remote IP address - EA logical TCP connection between a server and client is identified by
< TCP, local IP address, local port, remote IP address, remote port >
- AEach side of a TCP connection has a socket which can be identified by the following triple
73What are the 5 basic processes in a TCP socket implementation?
- AOpen a socket.
- BOpen an input stream and output stream to the socket.
- CRead from and write to the stream according to the server's protocol.
- DClose the streams.
- EClose the socket
741. On which layer according to the ISO/OSI- and/or the TCP-model is DNS located?
- A● ISO/OSI No.: 7 Name: Application Layer
- B● Internet No.: 4 Name: Application Layer
753. Which are no generic TLDs? Check all that apply:
- A.com
- B.technikum-wien.at
- C.at
- D.austria
- E.gov
- F.edu
- G.fhtw
- H.cc
76What is contained within a resource record? Check all that apply:
- ADomain name
- BDomain name registry
- CEither UDP or TCP protocol
- DType
- ETime-to-live
- FRange of IP addresses
- GRdata (e.g., IPv4 address)
778. If a local DNS server starts an iterative query, what is the correct order of inquired name servers? Check the correct answer.
- Aa. Authoritative name server – TLD server – root server
- Bb. Authoritative name server only, it performs further enquiries
- Cc. TLD name server
- Dd. TLD server – root server
- Ee. Root server – TLD server – authoritative name server
- Ff. Root server only, it performs further enquiries
78What is the correct complete order of the following headers for either IP, ARP or ICMP packets? Check all that applies.
- AEthernet – ARP – ICMP
- BEthernet – ARP
- CARP - IP
- DEthernet – ICMP
- EEthernet – IP – ICMP
- FEthernet – ARP - IP – ICMP
- GIP – ICMP
791Consider an ICMP response packet. What is the correct order of its different headers?
- AEthernet – IP – UDP –ICMP
- BEthernet - ICMP
- CEthernet – IP – ICMP
- DEthernet – ARP - ICMP
- EEthernet – IP – ICMP – TCP
- FIP – ICMP – Ethernet
80Which is the correct complete header order of DHCP packets in Ethernet LANs?
- AEthernet – RARP – BOOTP – DHCP
- BEthernet – RARP – DHCP
- CEthernet – UDP- DHCP
- DEthernet – TCP- DHCP
- EEthernet – IP - UDP- DHCP
- FEthernet – IP – TCP - DHCP
- GUDP – DHCP
81Check all correct orders of headers and payload, when an application process sends data via UDP, IP and Ethernet (ETH):
- AIP – ETH – UDP – payload
- BIP – UDP – payload
- CETH – IP – UDP – payload
- DETH – UDP – IP – payload
- EETH – UDP – payload
- FETH – IP – UDP – TCP – payload
- GETH – IP – UDP – SNMP – payload
8217. Check all correct orders of headers and payload, when an application process sends data via TCP, IP and Ethernet (ETH):
- AIP – ETH – TCP – payload
- BIP – TCP – payload
- CETH – IP – TCP – payload
- DETH – IP - TCP – HTTP – payload
- EETH – TCP – payload
- FIP –TCP – HTTP - payload
- GETH – IP – TCP – FTP – payload
Informações
- Descrição
- Quiz sobre Netzwerktechnik 2, criado por ampere em 23-01-2016.
- Autor
- ampere
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