Computer networkinstructor: wang xia2013-5-9

《Computer network

》Midterm Examination

Name:

Student number:

100min

Choice.

1．The () is a worldwide computer network, that is, a network that interconnects

millions of computing devices throughout the world.

A InternetBIntranet Cswitch netDtelevision net

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

AFramesB SegmentsCDatagramsDbit streams

3．() means that the switch must receive the entire packet before it can begin to

transmit the first bit of the packet onto the outbound link.

AStore-and-forward transmissionBFDM

CEnd-to-end connectionDTDM

4．In the following options, which one is not a guided(有线 ) media? ()

A twisted-pair wire

B

fiber optics C coaxial cable D satellite

5．Delay does not include (

).

A

Process delay

B

propagation delay

C

transmission delay D control

delay

6. In the following options, which belongs to the network core? (

)

A

end systems

B

routers

C clients

D

servers

7．The Internet’s connection-oriented service has a name, it is ( ).

A

TCP B UDP

C TCP/IP

D

IP

8．There are two fundamental approaches to building a network core, ( ) and packet

switching.

A

electrical current switching

B

circuit switching

C

data switching

D

message switching

9．A (

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

A

application-layer

B

transport-layer

C

network-layer

D

link-layer

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

A

Ethernet

B PPP

C

HDLC

D

IP

11．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

12．The 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

13．In the following descriptions about MAC address, which one is not correct? ( )

The MAC address is the address of one node’ s adapter.

No two adapters