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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.半自动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 supp
6、ose that the data D is , then the value of R is( ).A 010 9In 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 retransmit it w
7、ith 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 adapter.B No two a
8、dapters 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, IP address12Th
9、e 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. In the followi
10、ng 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 transmission rate of
11、 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-learningCforwarding Dop
12、timal routing18In the following four services, which one was not 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 is( ).A fi
13、ltering 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 parity bi
14、t 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 detect a
15、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 D64/24Wireless LAN using protocol ( ).AIEEE 802.3BIEEE 802.4CIEEE 802.5DIEEE 802.1125The following protoc
16、ols are belonging to multiple access protocols except for ( ).Achannel partitioning protocols信道划分协议Brouting protocolsCrandom access protocolsDtaking-turns protocols26Which of the following is not belonging to channel partitioning protocols? ( )ACSMABFDMCCDMADTDM27In the following four descriptions a
17、bout 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 a m
18、echanism 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-FF.
19、CA portable可移植的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 hos
20、tnames for hosts anywhere in the Internet.DARP resolves IP addresses for nodes anywhere in the Internet./In the LAN, ( )protocol dynamically assign IP addresses to hosts.ADNSBARPCDHCPDIP/33DHCP protocol is a four-step process: DHCP request. DHCP ACK. DHCP server discovery. DHCP server offer(s). The
21、correct 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、基带传输.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总线使用细同轴电缆.DThe Ethernet 10BaseT technology uses a star topology.37Ethernets multiple access protocol is ( ).ACDMABCSMA/CDCslo
23、tted ALOHADtoken-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中止 its transmission
24、 as soon as it detects 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 t
25、echnology uses( )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
26、 on frames.AswitchBhubCrouterDgateway43A 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 descriptio
27、ns, which one is 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
28、a collision domain 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
29、? ( )AhubBrouterCswitchDrepeater48Which 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 lay
30、er-2 broadcast storms.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? ( )冲突域AHub BSwitchCRouter DBridge51IEEE802.2 protocol belong to ( )layerAnetwork BMACCLLC Dphysical52IEEE
31、802.11 protocol defines ( )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
32、nodes well enter exponential back-off, that is all of the LAN segments belong to the same( ).Acollision domainBswitchCbridgeDhub55( )allows different nodes to transmit simultaneously同时地 and yet have their respective receivers correctly receive a senders encoded data bits.ACDMA BCSMA CCSMA/CD DCSMA/C
33、A56Because there are both 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 fl
34、ag sequence, appears anywhere in the frame, except in the flag field, PPP precedes that instance of the flag pattern with the control escape byte.AB 0x7DC D58The device ( ) can isolate隔离 collision domains for each of the LAN segment.AmodemBswitchChub DNIC59In the following four descriptions about PP
35、P, which one is not correct? ( )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 require
36、d to provide flow control.60In 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 linkCtakin
37、g down the PPP linkDall of the 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-point
38、BbroadcastCmulticastDall of the 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)D
39、synchronous66Which of the following 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 adapter
40、s parent node.BThe link interface 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 follo
41、wing is correct? ( )ABCD69( )divides time into time frames and further divides each time frame into N time slots.AFDMBTMDCCDMADCSMA/70With CDMA, each node is assigned a different ( )AcodeBtime slotCfrequencyDlink71Which of the following four descriptions about random access protocol is not correct?
42、( )AA transmission node transmits 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 escap
43、e byte . If the data is b1bb3b4b5, 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 administrator系统管理员安装的BARP table is built automatica
44、llyCARP table is dynamicDARP table maps IP addresses to MAC addresses75NIC works in ( )layer.AphysicalBlinkCnetworkDtransport/76In LAN, if UTP is used, the common connector is( ).AAUIBBNCCRJ-45DNNI/77The modems function(s) is(are) ( ).Atranslates digital signal into analog signalBtranslates analog signal into digital signalCboth translates analog signal into digital signal and translates digital signa