計算機網絡題庫(大連交通大學)chapter5

Chapter 5 The Link Layer and Local Area Network

1．A ( ) protocol is used to move a datagram over an individual link.

Aapplication-layer

Btransport-layer

Cnetwork-layer

Dlink-layer

2．The units of data exchanged by a link-layer protocol are called ( ).

Adatagrams

Bframes

Csegments

Dmessages

3．Which of the following protocols is not a link-layer protocol? ( )

AEthernet

BPPP

CHDLC

DIP

4．In 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 protocols 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.

5．Which of the following services can not offered by a link-layer protocol? ( )

Acongestion control

BLink Access

CError control

DFraming

6．( ) protocol serves to coordinate the frame transmissions of the many nodes when multiple nodes share a single broadcast link.

AARP

BMAC

CICMP

DDNS

7．In the following four descriptions about the adapter, which one is not correct? ( )

AThe adapter is also called as NIC.

BThe adapter is a semi-autonomous unit.

CThe main components of an adapter are bus interface and the link interface.

DThe 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 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 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 efficie