计算机网络题库(大连交通大学)chapter5.doc

Chapter 5 The Link Layer and Local work 1. A() protocol is used to move a datagram over an individual link. A application-layer B transport-layer work-layer D link-layer 2. The units of data exchanged bya link-layer protocol are called ( ). A datagrams B frames C segments D messages 3. Which of the following protocols isnot a link-layer protocol? () A B PPP C HDLC D IP4. In the following four descriptions, which one isnot correct? () A link-layer protocol has the node-to-node job of work-layer datagrams over a single link in the path. B The services provided by the link-layer protocols may be different. CA datagram must be handled by the same link-layer protocols on the different links in the path. D The actions taken bya link-layer protocol when sending and receiving frames include error detection, flow control and random access. 5. Which of the following services can not offered bya link-layer protocol? () A congestion 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 MAC C ICMP D DNS 7. In the following four descriptions about the adapter, which one isnot correct? () A The adapter is also called as NIC. B The adapter isa semi-autonomous unit. C The ponents of an adapter are bus interface and the link interface. D The adapter can provide all the link-layer services. 8. Consider CRC error checking approach, the four bit generator G is 1011, and suppose that the data D is10101010, then the value ofR is( ). A010 B100 C 011 D 110 9. In the following four descriptions about random access protocol, which one isnot correct? ()A In slotted ALOHA, nodes can transmit at random time. B In pure ALOHA, ifa frame experiences a collision, the node will immediately retransmit it with probability p. C The maximum efficiency ofa slotted ALOHA is higher than a pure ALOHA. D In CSMA/CD, one node listens to the channel before transmitting. 10. In the