计算机网络英文题库附答案chapter

Chapter 1 Computer Networks a n d t h e I n t e r n e t 1．The ( ) is a worldwide

computer network, that is,

a network that interconnects millions of computing devices throughout the world. ppt3 A public Internet B Intranet C switch net D television net 2．Which kind of media is not a guided media? ( ) A twisted-pair copper wire B a coaxial cable C fiber optics D digital satellite channel

3．Which kind of media is a

guided media? ( )

A geostationary satellite

B low-altitude satellite

C fiber optics

D wireless LAN 4．The units of data exchanged

by a link-layer protocol are

called ( ). A Frames

B Segments

C Datagrams

D bit streams

5．Which of the following

option belongs to the

circuit-switched networks?

( )

A FDM

B TDM

C VC networks

D both A and B

6．( )makes sure that neither

side of a connection overwhelms the other side by sending too many packets too fast.

A Reliable data transfer

B Flow control

C Congestion control

D Handshaking procedure 7．( ) 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. A Store-and-forward transmission B FDM C End-to-end connection D TDM

8．Datagram networks and

virtual-circuit networks differ in that ( ).

A datagram networks are circuit-switched networks, and virtual-circuit networks are

packet-switched networks. B datagram networks are

packet-switched networks, and virtual-circuit networks are

circuit-switched networks. C datagram networks use destination addresses and virtual-circuit networks use VC. numbers to forward packets toward their destination.

D datagram networks use VC.

numbers and

virtual-circuit networks use destination addresses to forward packets toward their destination. 9．In the following options,