Chapter 5 The Link Layer and Local Area Network 1．A ( ) protocol is used 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 framesC segments 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 services 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 sending and receiving frames include error detection, flow control and random access. 5．Which of the following 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 7．In the following four descriptions 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. 8．Consider CRC error checking approach, 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 C 011 D 110 9．In the following four descriptions about random acce...
