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计算机网络英文题库
Chapter 1 Computer Networks and the Internet
1．The ( A ) is a worldwide computer network, that is, a network that interconnects millions of computing devices throughout the world.
A public Internet
B Intranet
C switch net
D television net
2．Which kind of media is not a guided media? ( D )
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? ( C )
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 ).
A Frames
B Segments
C Datagrams
D bit streams
5．Which of the following option belongs to the circuit-switched networks? ( D )
A FDM
B TDM
C VC networks
D both A and B
6．(B) 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．( A ) 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 ( C ).
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.
数据报网络（datagram networks）和虚电路网络（virtual-circuit
networks）都是属于分组交换网络（packet-switched networks）。
9．In the following options, which one is not a guided media? ( D )
A twisted-pair wire
B fiber optics
C coaxial cable
D satellite
10．Processing delay does not include the time to ( B ).
A examine the packet’s header
B wait to transmit the packet onto the link
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