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 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 C.determine where to direct the packet D.check bit-error in the packet
11.In the following four descriptions, which one is correct? (C)
A.The traffic intensity must be greater than 1.
B.The fraction of lost packets increases as the traffic intensity decreases.
C.If the traffic intensity is close to zero, the average queuing delay will be close to zero. D.If the traffic intensity is close to one, the average queuing delay will be close to one. 12.The Internet’s network layer is responsible for moving network-layer packets known as (B) from one host to another.
A.frame B.datagram
C.segment D.message
13.The protocols of various layers are called (A).
A.the protocol stack B.TCP/IP
C.ISP D.network protocol
14.There are two classes of packet-switched networks: (A) networks and virtual-circuit networks.
A.datagram B.circuit-switched
C.television D.telephone
15.Access networks can be loosely classified into three categories: residential access, company access and (B) access.
A.cabled B.wireless
C.campus
D.city area
Question 16～17
Suppose, a is the average rate at which packets arrive at the queue, R is the transmission rate, and all packets consist of L bits, then the traffic intensity is (16: B ), and it should no greater than (17: B ). 16. A.LR／a 17.A.2
B.La／R B.1
C.Ra／L C.0 D.LR／a D.1
18.In the Internet, the equivalent concept to end systems is (A).
A.hosts B.servers
C.clients D.routers
19.In the Internet, end systems are connected together by (C).
A.copper wire B.coaxial cable
C.communication links D.fiber optics
20.End systems access to the Internet through its (C).
A.modems B.protocols
C.ISP D.sockets
21.End systems, packet switches, and other pieces of the Internet, run (D) that control the sending and receiving of information within the Internet.
A.programs B.processes
C.applications D.protocols
22.There are many private networks, such as many corporate and government networks, whose hosts cannot exchange messages with hosts outside of the private network. These private networks are often referred to as (C).
A.internets B.LAN
C.intranets D.WAN
23.The internet allows (D) running on its end systems to exchange data with each other.
A.clients applications B.server applications
C.P2P applications D.distributed applications
24.The Internet provides two services to its distributed applications: a connectionless