通信网络选择题100+答案.doc

The information to be communicated in a data communications system is the _______. Medium B、Protocol C、Transmission D、Message D 2．Communication between a computer and a keyboard involves ______________ transmission. A、simplex B、half-duplex C、full-duplex D、automatic A 3. _______ refers to the structure or format of the data, meaning the order in which they are presented. A、Semantics B、Timing C、Syntax D、none of the above C 4. The host-to-host delivery of the entire message is the responsibility of the _______ layer. A、Network B、Transport C、Application D、Physical A 5. In OSI/RM, the _______ layer lie between the transport layer and the application layer. A、data link and network B、session and presentation C、session and network D、presentation and network B 6. When data are transmitted from device A to device B, the header from As layer 4 is read by Bs _______ layer. A、Physical、Data link、Transport、None of the aboveWhy was the OSI model developed? A、Manufacturers disliked the TCP/IP protocol suite.B、The rate of data transfer was increasing exponentiallyC、Standards were needed to allow any two systems to communicateD、None of the aboveIn the OSI model, encryption and decryption are functions of the ________ layer. A、transport B、presentation C、session D、application B 9. _______ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer. A、 TCP B、UDP C、IP D、None of the above B 10. The physical, data link, and network layers are the ______ support layers. A、 user B、network C、both (a) and (b) D、none of the above A 11. The _________ product defines the number of bits that can fill the link. A、bandwidth-period B、frequency-amplitude C、b