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1、Chapter 5 The Link Layer and Local Area Network 1A ( ) protocol is used to move a datagram over an individual link. A application-layer B transport-layer C network-layer D link-layer 2The units of data exchanged by a link-layer protocol are called ( ). A datagrams B framesC segments D messages 3Whic
2、h of the following protocols is not a link-layer protocol? ( ) A Ethernet B PPP C HDLC D IP 4In the following four descriptions, which one is not correct? ( ) A link-layer protocol has the node-to-node job of moving network-layer datagrams over a single link in the path. B The services provided by t
3、he link-layer protocols may be different. C A datagram must be handled by the same link-layer protocols on the different links in the path. D The actions taken by a link-layer protocol when sending and receiving frames include error detection, flow control and random access. 5Which of the following
4、services can not offered by a link-layer protocol? ( ) Acongestion control B Link Access C Error control D Framing 6( ) protocol serves to coordinate the frame transmissions of the many nodes when multiple nodes share a single broadcast link. A ARP B MACC ICMP D DNS 7In the following four descriptio
5、ns about the adapter, which one is not correct? ( ) A The adapter is also called as NIC. B The adapter is a semi-autonomous unit. C The main components of an adapter are bus interface and the link interface. D The adapter can provide all the link-layer services. 8Consider CRC error checking approach
6、, the four bit generator G is 1011, and suppose that the data D is 10101010, then the value of R is( ). A 010 B 100 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 15 页 - - - - - - - - - C 011 D 110 9In the following four descriptions about random access protoco
7、l, 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 with probability p. C The maximum efficiency of a slotted ALOHA is higher than a pure ALOHA. D In CSMA/CD, one node lis
8、tens 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 adapters have the same MAC address. C The MAC address doesnt change no matter where the adapter goes.D MAC address
9、has a hierarchical structure. 11The ARP protocol can translate ( ) into ( ). ( ) A host name, IP address B host name, MAC address C IP address, MAC address D broadcast address, IP address 12The value of Preamble field in Ethernet frame structure is ( ) A 10101010 10101010 10101010 11111111B 10101011
10、 10101011 10101011 10101011C 10101010 10101010 10101010 10101011D 10101010 10101010 10101010 1010101013There are four steps in DHCP, the DHCP server can complete ( ). A DHCP server discovery B DHCP server offers C DHCP request D DHCP response 14 In CSMA/CD, the adapter waits some time and then retur
11、ns to sensing the channel. In the following four times, which one is impossible? ( ) A 0 bit times B 512 bit times C 1024 bit times D 1028 bit times 15The most common Ethernet technologies are 10BaseT and 100BaseT. “10” and “100” indicate( ). A the maximum length between two adapters B the minimum l
12、ength between two adapters C the transmission rate of the channel D the transmission rate of the node 16The principal components of PPP include but not( ). A framing B physical-control protocol 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 15 页 - - - - - - - -
13、 - C link-layer protocol D network-layer protocol 17In the following four options, which service can not be provided by switch? ( ) A filtering B self-learning C forwarding D optimal routing 18In the following four services, which one was be required in PPP? ( ) A packet framing B error detection C
14、error correction D multiple types of link 19The ability to determine the interfaces to which a frame should be directed, and then directing the frame to those interfaces is( ). A filtering B forwarding C self-learning D optimal routing 20In ( ) transmission(s), the nodes at both ends of a link may t
15、ransmit packets at the same time. A full-duplex B half-duplex C single-duplex D both full-duplex and half-duplex 21Consider the data D is 01110010001, if use even parity checking approach, the parity bit is( ), if use odd parity checking approach, the parity bit is( ). ( ) A 0 1 B 0 0 C 1 1 D 1 022I
16、n the following four descriptions about parity checks, which one is correct? ( ) A Single-bit parity can detect all errors. B Single-bit parity can correct one errors. C Two-dimensional parity not only can detect a single bit error, but also can correct that error.D Two-dimensional parity not only c
17、an detect any combination of two errors, but also can correct them. 23MAC address is ( ) bits long. A 32 B 48 C 128 D 64 24Wireless LAN using protocol ( ). A IEEE 802.3 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 15 页 - - - - - - - - - B IEEE 802.4 C IEEE 80
18、2.5 D IEEE 802.11 25The following protocols are belonging to multiple access protocols except for ( ). A channel partitioning protocols B routing protocolsC random access protocols D taking-turns protocols 26Which of the following is not belonging to channel partitioning protocols? ( ) A CSMA B FDM
19、C CDMA D TDM 27In the following four descriptions about CSMA/CD, which one is not correct? ( ) A A node listens to the channel before transmitting. B If someone else begins talking at the same time, stop talking. C A transmitting node listens to the channel while it is transmitting. D With CSMA/CD,
20、the collisions can be avoided completely.28( ) provides a mechanism for nodes to translate IP addresses to link-layer address. A IP B ARPC RARP D DNS 29A MAC address is a ( )address. A physical-layer B application-layer C link-layerD network-layer 30Which of the following is correct? ( ) A No two ad
21、apters have the same MAC address. B MAC broadcast address is FF-FF-FF-FF-FF-FF. C A portable computer with an Ethernet card always has the same MAC address, no matter where the computer goes. D All of the above 31In the following four descriptions, which one is not correct? ( ) A ARP resolves an IP
22、address to a MAC address. B DNS resolves hostnames to IP addresses. C DNS resolves hostnames for hosts anywhere in the Internet. D ARP resolves IP addresses for nodes anywhere in the Internet.32In the LAN, ( )protocol dynamically assign IP addresses to hosts. A DNS 名师资料总结 - - -精品资料欢迎下载 - - - - - - -
23、 - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 15 页 - - - - - - - - - B ARP C DHCPD IP 33DHCP protocol is a four-step process: DHCP request. DHCP ACK. DHCP server discovery. DHCP server offer(s). The correct sequence is ( ) A B C D 34In the Ethernet frame structure, the CRC field is ( )bytes. A
24、 2 B4 C 8 D 32 35In the Ethernet frame structure, the Data field carries the ( ). AIP datagram B segment C frame D message 36In the following four descriptions, which one is not correct? ( ) A Ethernet uses baseband transmission. B All of the Ethernet technologies provide connection-oriented reliabl
25、e service to the network layer.C The Ethernet 10Base2 technology uses a thin coaxial cable for the bus. D The Ethernet 10BaseT technology uses a star topology. 37Ethernet s multiple access protocol is ( ). A CDMA B CSMA/CD C slotted ALOHA D token-passing protocol 38In the following four descriptions
26、 about CSMA/CD, which one is not correct? ( ) A An adapter may begin to transmit at any time. B An adapter never transmits a frame when it senses that some other adapter is transmitting. C A transmitting adapter aborts its transmission as soon as it detects that another adapter is also transmitting.
27、 D An adapter retransmits when it detects a collision.39Which of the following descriptions about CSMA/CD is correct? ( ) A No slots are used. B It uses carrier sensing. C It uses collision detection. DAll of the above.40The Ethernet 10BaseT technology uses( )as its physical media. 名师资料总结 - - -精品资料欢
28、迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 15 页 - - - - - - - - - A fiber optics B twisted-pair copper wireC coaxial cable D satellite radio channel 41For 10BaseT, the maximum length of the connection between an adapter and the hub is ( )meters. A 100 B 200 C 500 D 10 42A (
29、 )is a physical-layer device that acts on individual bits rather than on frames. A switch B hub C router D gateway 43A hub is a ( )device that acts on individual bits rather than on frames. A physical-layerB link-layer C network-layer D ransport-layer 44A switch is a( )device that acts on frame. A p
30、hysical-layer B link-layerC network-layer D transport-layer 45In the following four descriptions, which one is not correct? ( ) A Switches can interconnect different LAN technologies. B Hubs can interconnect different LAN technologies. C There is no limit to how large a LAN can be when switches are
31、used to interconnect LAN segments. D There is restriction on the maximum allowable number of nodes in a collision domain when hubs are used to interconnect LAN segments. 46 The ability to determine whether a frame should be forwarded to some interface or should just be dropped is ( ). A filtering B
32、forwarding C self-learning D optimal routing 47Which of the following devices is not a plug and play device? ( ) A hub B routerC switch D repeater 48Which of the following devices is not cut-through device? ( ) 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 15
33、页 - - - - - - - - - A hub B routerC switch D repeater 49In the following four descriptions, which one is not correct? ( ) A Switches do not offer any protection against broadcast storms. B Routers provide firewall protection against layer-2 broadcast storms. C Both switches and routers are plug and
34、play devices. D A router is a layer-3 packet switch, a switch is a layer-2 packet switch. 50Which device has the same collision domain? ( ) A Hub B Switch C Router D Bridge 51IEEE802.2 protocol belong to ( )layer A network B MAC C LLC D physical 52IEEE802.11 protocol defines ( )rules. A Ethernet Bus
35、 B wireless WAN C wireless LAND Token Bus 53In data link-layer, which protocol is used to share bandwidth? ( ) A SMTP B ICMP C ARPD CSMA/CD 54When 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 exponential back-
36、off, that is all of the LAN segments belong to the same( ). A collision domainB switch C bridge D hub 55 ( )allows different nodes to transmit simultaneously and yet have their respective receivers correctly receive a senders encoded data bits.A CDMA B CSMA C CSMA/CD D CSMA/CA 56Because there are bo
37、th network-layer addresses (for example, Internet IP addresses) and link-layer addresses (that is, LAN addresses), there is a need to 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 15 页 - - - - - - - - - translate between them. For the Internet, this is the job
38、 of ( ). A RIP B OSPF C ARP D IP 57PPP defines a special control escape byte, ( ). If the flag sequence, 01111110 appears anywhere in the frame, except in the flag field, PPP precedes that instance of the flag pattern with the control escape byte. A 01111110 B 01111101C 10011001 D 10111110 58The dev
39、ice ( ) can isolate collision domains for each of the LAN segment. A modem B switch C hub D NIC 59In the following four descriptions about PPP, which one is not correct? ( ) A PPP is required to detect and correct errors. B PPP is not required to deliver frames to the link receiver in the same order
40、 in which they were sent by the link sender. C PPP need only operate over links that have a single sender and a single receiver. D PPP is not required to provide flow control. 60In the PPP data frame, the( ) field tells the PPP receivers the upper-layer protocol to which the received encapsulated da
41、ta belongs. A flag B control C protocol D checksum 61PPP s link -control protocols (LCP) accomplish ( ). A initializing the PPP link B maintaining the PPP link C taking down the PPP link D all of the above 62The PPP link always begins in the ( ) state and ends in the ( ) state. ( ) A open, terminati
42、ng B open, dead C dead, deadD dead, terminating 63For( ) links that have a single sender at one end of the link and a single receiver at the other end of the link. A point-to-pointB broadcast C multicast 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 8 页，共 15 页 - - -
43、 - - - - - - D all of the above 64 With ( )transmission, the nodes at both ends of a link may transmit packets at the same time. A half-duplex B full-duplex C simplex(单工) D synchronous 65 With ( ) transmission, a node can not both transmit and receive at the same time. A half-duplex B full-duplex C
44、simplex(单工) D synchronous 66Which of the following functions cant be implemented in the NIC? ( ) A encapsulation and decapsulation B error detection C multiple access protocol D routing 67Which of the following four descriptions is wrong? ( ) A The bus interface of an adapter is responsible for comm
45、unication with the adapter s parent node.B The link interface of an adapter is responsible for implementing the link-layer protocol. C The bus interface may provide error detection, random access functions.D The main components of an adapter are the bus interface and the link interface. 68For odd pa
46、rity schemes, which of the following is correct? ( ) A 011010001 B 111000110C 110101110 D 000110110 69( )divides time into time frames and further divides each time frame into N time slots. A FDM B TMD C CDMA D CSMA 70With CDMA, each node is assigned a different ( ) A codeB time slot C frequency D l
47、ink 71Which of the following four descriptions about random access protocol is not correct? ( ) A A transmission node transmits at the full rate of the channel B When a collision happens, each node involved in the collision retransmits at once.名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - -
48、 名师精心整理 - - - - - - - 第 9 页，共 15 页 - - - - - - - - - C Both slotted ALOHA and CSMA/CD are random access protocols. D With random access protocol, there may be empty slots. 72 PPP defines a special control escape byte 01111101. If the data is b1b201111110b3b4b5, the value is( )after byte stuffing. A
49、b1b20111110101111110b3b4b5 B b1b20111111001111101b3b4b5 C b5b4b30111111001111101b2b1 D b5b4b30111110101111110b2b1 73MAC address is in ( ) of the computer. A RAM B NIC C hard disk D cache 74Which of the following is wrong? ( ) A ARP table is configured by a system administratorB ARP table is built au
50、tomatically C ARP table is dynamic D ARP table maps IP addresses to MAC addresses 75NIC works in ( )layer. A physical B link C network D transport 76In LAN, if UTP is used, the common connector is( ). A AUI B BNC C RJ-45 D NNI 77The modem s function(s) is(are) ( ). A translates digital signal into a