DXQR《计算机网络》复习题及答案.docVIP

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. 9.In the following optio