（完整版）计算机⽹络英⽂题库（附答案）chapter5 Chapter 5 The Link Layer and Local Area Network
1．A ( ) protocol is ud to move a datagram over an individual link.
A application-layer
B transport-layer
C network-layer
D link-layer
2．The units of data exchanged by a link-layer protocol are called ( ).
A datagrams
B frames
C gments
D messages
3．Which of the following protocols is not a link-layer protocol? ( )
A Ethernet
B PPP
C HDLC
D IP
4．In 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 rvices provided by the 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 nding and receiving frames include error detection, flow control and random access.
5．Which of the following rvices can not offered by a link-layer protocol? ( )
A congestion control
B Link Access
C Error control
D Framing
海盐公主6．( ) protocol rves to coordinate the frame transmissions of the many nodes when multiple nodes share a single broadcast link.
A ARP
B MAC
C ICMP
D DNS
7．In the following four descriptions about the adapter, which one is not correct? ( )
A The adapter is also called as NIC.
腊月初八B The adapter is a mi-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 rvices.
8．Consider CRC error checking approach, the four bit generator G is 1011, and suppo that the data D is 10101010, then the value of R is( ).
A 010
B 100
C 011
D 110
9．In the following four descriptions about random access protocol, which one is not correct? ( )
A I n slotted ALOHA, nodes can transmit at random time.
B I n pure ALOHA, if a frame experiences a collision, the node will immediately retransmit it with probability p.
C T he maximum efficiency of a slotted ALOHA is higher than a pure ALOHA.
D I n CSMA/CD, one node listens to the channel before transmitting.
10．In the following descriptions about MAC address, which one is not correct? ( )
A T he MAC address is the address of one node’s adapter.
B N o two adapters have the same MA
C address.
C T he MAC address doesn’t change no matter where the adapter goes.
D M AC address has a hierarchical structure.
11．The ARP protocol can translate ( ) into ( ). ( )
A h ost name, IP address
B h ost name, MA
C address
C I P address, MAC address
D broadcast address, IP address
12．The value of Preamble field in Ethernet frame structure is ( )
A 10101010 10101010……10101010 11111111
B 10101011 10101011……10101011 10101011
C 10101010 10101010……10101010 10101011
D 10101010 10101010……10101010 10101010
13．There are four steps in DHCP, the DHCP rver can complete ( ).
A DHCP rver discovery
B DHCP rver offers
C DHCP request
D DHCP respon
14．In CSMA/CD, the adapter waits some time and then returns to nsing the channel. In the following four times, which one is impossible? ( )
九月文案A 0 bit times
B 512 bit times
C 1024 bit times
D 1028 bit times
15．The most common Ethernet technologies are 10BaT and 100BaT. “10” and “100” indicate( ).
A the maximum length between two adapters
B the minimum length between two adapters
C the transmission rate of the channel
D the transmission rate of the node
16．The principal components of PPP include but not( ).
A framing
B physical-control protocol
C link-layer protocol
优美的开头结尾D network-layer protocol
17．In the following four options, which rvice can not be provided by switch? ( )
A filtering
B lf-learning
C forwarding
D optimal routing
18．In the following four rvices, which one was be required in PPP? ( )
A packet framing
B error detection
C error correction
D multiple types of link
19．The ability to determine the interfaces to which a frame should be directed, and then directing the frame to tho interfaces is( ).
花茶的冲泡方法A filtering
B forwarding
C lf-learning
D optimal routing
20．In ( ) transmission(s), the nodes at both ends of a link may transmit packets at the same time.
A full-duplex
B half-duplex
C single-duplex
D both full-duplex and half-duplex
21．Consider the data D is 01110010001, if u even parity checking approach, the parity bit is( ① ), if u odd parity checking approach, the parity bit is( ② ). ( )
A ①0 ②1
B ①0 ②0
C ①1 ②1
D ①1 ②0
22．In 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 can detect any combination of two errors, but also can correct them.
23．MAC address is ( ) bits long.
A 32
B 48
C 128
D 64
24．Wireless LAN using protocol ( ).
A IEEE 802.3
B IEEE 802.4
C IEEE 802.5
D IEE
E 802.11
25．The following protocols are belonging to multiple access protocols except for ( ).
A channel partitioning protocols
B routing protocols
C random access protocols
D taking-turns protocols
26．Which of the following is not belonging to channel partitioning protocols? ( )
A CSMA
B FDM
C CDMA
D TDM
27．In the following four descriptions about CSMA/CD, which one is not correct? ( )
A A node listens to the channel before transmitting.
B If someone el begins talking at the same time, stop talking.
道谢C A transmitting node listens to the channel while it is transmitting.
D With CSMA/CD, the collisions can be avoided completely.
28．( ) provides a mechanism for nodes to translate IP address to link-layer address.
A IP
B ARP
C RARP
D DNS
29．A MAC address is a ( )address.快乐的兔子
A physical-layer
B application-layer
C link-layer
D network-layer
30．Which of the following is correct? ( )
A No two adapters have the same MAC address.
B MA
C 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
31．In the following four descriptions, which one is not correct? ( )
A ARP resolves an IP address to a MAC address.
B DNS resolves hostnames to IP address.
C DNS resolves hostnames for hosts anywhere in the Internet.
D ARP resolves IP address for nodes anywhere in the Internet.
32．In the LAN, ( )protocol dynamically assign IP address to hosts.
A DNS
B ARP
C DHCP
D IP
33．DHCP protocol is a four-step process: ①DHCP request. ②DHCP ACK. ③DHCP rver discovery. ④DHCP rver offer(s). The correct quence is ( )
A ①②③④
B ③②①④泡红辣椒
C ③④①②
D ①④③②
34．In the Ethernet frame structure, the CRC field is ( )bytes.
