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数据通信题库复习
数据通信与计算机通信网 Chapter ONE
1. Data transmission means? ? ? ? ? ?.
Data transfer in electromagnetic wave signal on media between sources and destination.
2. ?The main function of transmitter in data communications system is?.
?generating signal which is suitable to be transmitted in the communication system
3. ?The topology that are suitable for broadcast channel are??.?
bus and ring topology
Chapter TWE(DBBBA)
Which one of the following is not exist in OSI model?
答案
A. ?T-PDU B. ?N-PDU
? C. ?DL-PDU D. ??PHY-PDU
2.?
?Except for the unique global network-level address, every application in a computer attached to network must be assigned a unique local address which is called??.
答案B
A. ?SAP or NSAP B. ?SAP or NSAP C. ??MAC or DTE D. IP or NSAP
3.?
?The ISO layer responsible for providing connection management and reliable end-to-end user service is??.
答案
A. ??Network Layer B. ?Transport Laye C. ?Session Layer D. ?Application Layer
4.?
?Network protocol may be defined as a set of rules governing the exchange of data between???in computer network and distributing system.
答案
A. ?entities of adjacent layers B. entities of peer layers C. ??entities at the same layers D. entities of different layers ?
5.?There are???layers in OSI architecture.
答案
A. ?seven B. ?five? C. ??three D. ?two
Chapter THree (AACBD BBABA CDCA)
?
?The spectrum of a signal is?? ???.
答案
A. ?the range of frequencies that it contains B. ?the range of frequencies that it occupied in a channel. C. ?its composed frequencies D. ??its fundamental frequency ?
?Several opinions about the relationship between data rate and bandwidth are in following, the correct one is??.
?
答案
A. ?The higher the data rate, the greater is its effective bandwidth. B. ?The higher the data rate, the smaller is its effective bandwidth.
? C. ?The data rate is independent of bandwidth,and dependent of the form of signal. D. ?The data rate is indepen
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