计算机网络英文题库(共15页)

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1、精选优质文档-倾情为你奉上Chapter 5 The Link Layer and Local Area Network1A ( ) protocol is used to move a datagram over an individual link.Aapplication-layerBtransport-layerCnetwork-layerDlink-layer2The units of data exchanged by a link-layer protocol are called ( ).AdatagramsBframesCsegments Dmessages3Which of

2、 the following protocols is not a link-layer protocol? ( )AEthernetBPPPCHDLCDIP4In the following four descriptions, which one is not correct? ( )Alink-layer protocol has the node-to-node job of moving network-layer datagrams over a single link in the path.BThe services provided by the link-layer pro

3、tocols may be different.CA datagram must be handled by the same link-layer protocols on the different links in the path.DThe actions taken by a link-layer protocol when sending and receiving frames include error detection, flow control and random access.5Which of the following services can not offer

4、ed by a link-layer protocol? ( )Acongestion controlBLink AccessCError controlDFraming6( ) protocol serves to coordinate the frame transmissions of the many nodes when multiple nodes share a single broadcast link.AARPBMACCICMPDDNS7In the following four descriptions about the adapter, which one is not

5、 correct? ( )AThe adapter is also called as NIC.BThe adapter is a semi-autonomous unit.CThe main components of an adapter are bus interface and the link interface.DThe adapter can provide all the link-layer services.8Consider CRC error checking approach, the four bit generator G is 1011, and suppose

6、 that the data D is , then the value of R is( ).A 010 B 100 C 011 D 1109In the following four descriptions about random access protocol, which one is not correct? ( )A In slotted ALOHA, nodes can transmit at random time.B In pure ALOHA, if a frame experiences a collision, the node will immediately r

7、etransmit it with probability p.C The maximum efficiency of a slotted ALOHA is higher than a pure ALOHA.D In CSMA/CD, one node listens to the channel before transmitting.10In the following descriptions about MAC address, which one is not correct? ( )A The MAC address is the address of one nodes adap

8、ter.B No two adapters have the same MAC address.C The MAC address doesnt change no matter where the adapter goes.D MAC address has a hierarchical structure.11The ARP protocol can translate ( ) into ( ). ( )A host name, IP address B host name, MAC addressC IP address, MAC address Dbroadcast address,

9、IP address12The value of Preamble field in Ethernet frame structure is ( )A B C D 13There are four steps in DHCP, the DHCP server can complete ( ).ADHCP server discovery BDHCP server offersCDHCP request DDHCP response14In CSMA/CD, the adapter waits some time and then returns to sensing the channel.

10、In the following four times, which one is impossible? ( )A0 bit times B512 bit times C1024 bit times D1028 bit times15The most common Ethernet technologies are 10BaseT and 100BaseT. “10” and “100” indicate( ).Athe maximum length between two adaptersBthe minimum length between two adaptersCthe transm

11、ission rate of the channelDthe transmission rate of the node16The principal components of PPP include but not( ).Aframing Bphysical-control protocol Clink-layer protocol Dnetwork-layer protocol17In the following four options, which service can not be provided by switch? ( )Afiltering Bself-learningC

12、forwarding Doptimal routing18In the following four services, which one was be required in PPP? ( )Apacket framing Berror detectionCerror correction D multiple types of link19The ability to determine the interfaces to which a frame should be directed, and then directing the frame to those interfaces

13、is( ).A filtering B forwardingC self-learning D optimal routing20In ( ) transmission(s), the nodes at both ends of a link may transmit packets at the same time.Afull-duplex Bhalf-duplexCsingle-duplexDboth full-duplex and half-duplex21Consider the data D is , if use even parity checking approach, the

14、 parity bit is( ), if use odd parity checking approach, the parity bit is( ). ( ) A0 1B0 0C1 1D1 022In the following four descriptions about parity checks, which one is correct? ( )ASingle-bit parity can detect all errors.BSingle-bit parity can correct one errors.CTwo-dimensional parity not only can

15、 detect a single bit error, but also can correct that error.DTwo-dimensional parity not only can detect any combination of two errors, but also can correct them.23MAC address is ( ) bits long.A32 B48 C128 D6424Wireless LAN using protocol ( ).AIEEE 802.3BIEEE 802.4CIEEE 802.5DIEEE 802.1125The followi

16、ng protocols are belonging to multiple access protocols except for ( ).Achannel partitioning protocolsBrouting protocolsCrandom access protocolsDtaking-turns protocols26Which of the following is not belonging to channel partitioning protocols? ( )ACSMABFDMCCDMADTDM27In the following four description

17、s about CSMA/CD, which one is not correct? ( )AA node listens to the channel before transmitting.BIf someone else begins talking at the same time, stop talking.CA transmitting node listens to the channel while it is transmitting.DWith CSMA/CD, the collisions can be avoided completely.28( ) provides

18、a mechanism for nodes to translate IP addresses to link-layer address.AIPBARPCRARPDDNS29A MAC address is a ( )address.Aphysical-layerBapplication-layerClink-layerDnetwork-layer30Which of the following is correct? ( )ANo two adapters have the same MAC address.BMAC broadcast address is FF-FF-FF-FF-FF-

19、FF.CA portable computer with an Ethernet card always has the same MAC address, no matter where the computer goes.DAll of the above31In the following four descriptions, which one is not correct? ( )AARP resolves an IP address to a MAC address.BDNS resolves hostnames to IP addresses.CDNS resolves host

20、names for hosts anywhere in the Internet.DARP resolves IP addresses for nodes anywhere in the Internet.32In the LAN, ( )protocol dynamically assign IP addresses to hosts.ADNSBARPCDHCPDIP33DHCP protocol is a four-step process: DHCP request. DHCP ACK. DHCP server discovery. DHCP server offer(s). The c

21、orrect sequence is ( )ABCD34In the Ethernet frame structure, the CRC field is ( )bytes.A2B4C8D3235In the Ethernet frame structure, the Data field carries the ( ).AIP datagramBsegmentCframeDmessage36In the following four descriptions, which one is not correct? ( )AEthernet uses baseband transmission.

22、BAll of the Ethernet technologies provide connection-oriented reliable service to the network layer.CThe Ethernet 10Base2 technology uses a thin coaxial cable for the bus.DThe Ethernet 10BaseT technology uses a star topology.37Ethernets multiple access protocol is ( ).ACDMABCSMA/CDCslotted ALOHADtok

23、en-passing protocol38In the following four descriptions about CSMA/CD, which one is not correct? ( )AAn adapter may begin to transmit at any time.BAn adapter never transmits a frame when it senses that some other adapter is transmitting.CA transmitting adapter aborts its transmission as soon as it d

24、etects that another adapter is also transmitting.DAn adapter retransmits when it detects a collision.39Which of the following descriptions about CSMA/CD is correct? ( )ANo slots are used.BIt uses carrier sensing.CIt uses collision detection.DAll of the above.40The Ethernet 10BaseT technology uses( )

25、as its physical media.Afiber opticsBtwisted-pair copper wireCcoaxial cableDsatellite radio channel41For 10BaseT, the maximum length of the connection between an adapter and the hub is ( )meters.A100B200C500D1042A ( )is a physical-layer device that acts on individual bits rather than on frames.Aswitc

26、hBhubCrouterDgateway43A hub is a ( )device that acts on individual bits rather than on frames.Aphysical-layerBlink-layerCnetwork-layerDransport-layer44A switch is a( )device that acts on frame.Aphysical-layerBlink-layerCnetwork-layerDtransport-layer45In the following four descriptions, which one is

27、not correct? ( )ASwitches can interconnect different LAN technologies.BHubs can interconnect different LAN technologies.CThere is no limit to how large a LAN can be when switches are used to interconnect LAN segments.DThere is restriction on the maximum allowable number of nodes in a collision domai

28、n when hubs are used to interconnect LAN segments.46The ability to determine whether a frame should be forwarded to some interface or should just be dropped is ( ).A filtering B forwardingC self-learning D optimal routing47Which of the following devices is not a plug and play device? ( )AhubBrouterC

29、switchDrepeater48Which of the following devices is not cut-through device? ( )AhubBrouterCswitchDrepeater49In the following four descriptions, which one is not correct? ( )ASwitches do not offer any protection against broadcast storms.BRouters provide firewall protection against layer-2 broadcast st

30、orms.CBoth switches and routers are plug and play devices.DA router is a layer-3 packet switch, a switch is a layer-2 packet switch.50Which device has the same collision domain? ( )AHub BSwitchCRouter DBridge51IEEE802.2 protocol belong to ( )layerAnetwork BMACCLLC Dphysical52IEEE802.11 protocol defi

31、nes ( )rules.AEthernet Bus Bwireless WANCwireless LANDToken Bus53In data link-layer, which protocol is used to share bandwidth? ( )ASMTPBICMP CARPDCSMA/CD54When two or more nodes on the LAN segments transmit at the same time, there will be a collision and all of the transmitting nodes well enter exp

32、onential back-off, that is all of the LAN segments belong to the same( ).Acollision domainBswitchCbridgeDhub55( )allows different nodes to transmit simultaneously and yet have their respective receivers correctly receive a senders encoded data bits.ACDMA BCSMA CCSMA/CD DCSMA/CA56Because there are bo

33、th network-layer addresses (for example, Internet IP addresses) and link-layer addresses (that is, LAN addresses), there is a need to translate between them. For the Internet, this is the job of ( ).ARIP BOSPF CARP DIP57PPP defines a special control escape byte, ( ). If the flag sequence, appears an

34、ywhere in the frame, except in the flag field, PPP precedes that instance of the flag pattern with the control escape byte.ABC D58The device ( ) can isolate collision domains for each of the LAN segment.AmodemBswitchChub DNIC59In the following four descriptions about PPP, which one is not correct? (

35、 )APPP is required to detect and correct errors.BPPP is not required to deliver frames to the link receiver in the same order in which they were sent by the link sender.CPPP need only operate over links that have a single sender and a single receiver.DPPP is not required to provide flow control.60In

36、 the PPP data frame, the( ) field tells the PPP receivers the upper-layer protocol to which the received encapsulated data belongs.AflagBcontrolCprotocolDchecksum61PPPs link-control protocols (LCP) accomplish ( ).Ainitializing the PPP linkBmaintaining the PPP linkCtaking down the PPP linkDall of the

37、 above62The PPP link always begins in the ( ) state and ends in the ( ) state. ( )Aopen, terminatingBopen, deadCdead, deadDdead, terminating63For( ) links that have a single sender at one end of the link and a single receiver at the other end of the link.Apoint-to-pointBbroadcastCmulticastDall of th

38、e above64With ( )transmission, the nodes at both ends of a link may transmit packets at the same time.Ahalf-duplexBfull-duplexCsimplex(单工)Dsynchronous65With ( ) transmission, a node can not both transmit and receive at the same time.Ahalf-duplexBfull-duplexCsimplex(单工)Dsynchronous66Which of the foll

39、owing functions cant be implemented in the NIC? ( )Aencapsulation and decapsulationBerror detectionCmultiple access protocolDrouting67Which of the following four descriptions is wrong? ( )AThe bus interface of an adapter is responsible for communication with the adapters parent node.BThe link interf

40、ace of an adapter is responsible for implementing the link-layer protocol.CThe bus interface may provide error detection, random access functions.DThe main components of an adapter are the bus interface and the link interface.68For odd parity schemes, which of the following is correct? ( )ABCD69( )d

41、ivides time into time frames and further divides each time frame into N time slots.AFDMBTMDCCDMADCSMA70With CDMA, each node is assigned a different ( )AcodeBtime slotCfrequencyDlink71Which of the following four descriptions about random access protocol is not correct? ( )AA transmission node transmi

42、ts at the full rate of the channelBWhen a collision happens, each node involved in the collision retransmits at once.CBoth slotted ALOHA and CSMA/CD are random access protocols.DWith random access protocol, there may be empty slots.72PPP defines a special control escape byte . If the data is b1bb3b4

43、b5, the value is( )after byte stuffing.Ab1bb3b4b5Bb1bb3b4b5Cb5b4bb2b1Db5b4bb2b173MAC address is in ( ) of the computer.ARAMBNICChard diskDcache74Which of the following is wrong? ( )AARP table is configured by a system administratorBARP table is built automaticallyCARP table is dynamicDARP table maps

44、 IP addresses to MAC addresses75NIC works in ( )layer.AphysicalBlinkCnetworkDtransport76In LAN, if UTP is used, the common connector is( ).AAUIBBNCCRJ-45DNNI77The modems function(s) is(are) ( ).Atranslates digital signal into analog signalBtranslates analog signal into digital signalCboth translates

45、 analog signal into digital signal and translates digital signal into analog signalDtranslates one kind of digital signal into another digital signal78( )defines Token-Ring protocol.AIEEE 802.3BIEEE 802.4CIEEE 802.5DIEEE 802.279( )defines Token-Bus protocol.AIEEE 802.3BIEEE 802.4CIEEE 802.5DIEEE 802

46、.280( ) defines CSMA/CD protocol.AIEEE 802.3BIEEE 802.4CIEEE 802.5DIEEE 802.281The computer network that concentrated in a geographical area, such as in a building or on a university campus, is ( )Aa LANBa MANCa WANDthe Internet82The MAC address is ( ) bits long.A32B48C128D25683Which of the followin

47、g four descriptions about MAC addresses is wrong? ( )Aa MAC address is burned into the adapters ROMBNo two adapters have the same addressCAn adapters MAC address is dynamicDA MAC address is a link-layer address84Which of the following four descriptions about DHCP is correct? ( )ADHCP is C/S architec

48、tureBDHCP uses TCP as its underlying transport protocolCThe IP address offered by a DHCP server is valid foreverDThe DHCP server will offer the same IP address to a host when the host requests an IP address85 The ( )field permits Ethernet to multiplex network-layer protocols.ApreambleBtypeCCRCDdesti

49、nation MAC address86For 10BaseT, the maximum length of the connection between an adapter and the hub is ( ) meters.A50B100C200D50087An entry in the switch table contains the following information excepts for ( )Athe MAC address of a nodeBthe switch interface that leads towards the nodeCthe time at w

50、hich the entry for the node was placed in the tableDthe IP address of a node88Consider the 4-bit generator , G is 1001, and suppose that D has the value . What is the value of R?89Consider the following graph of the network. Suppose Host A will send a datagram to Host B, Host A run OICQ on port 4000, Host B run OICQ on port 8000. All of ARP tables are up to date. Enumerate all the steps when message “Hello” is sent from host A to host B.专心-专注-专业