12年自考《计算机网络与通信》模拟试题（12 years self-examination computer network and communication simulation exam question）.doc

12年自考《计算机网络与通信》模拟试题（12 years self-examination computer network and communication simulation exam question） 12 years self-examination computer network and communication simulation test questions Problem number one 1. The cost of ISDN BRI is the data rate () 10.5% 10.5% a. b. c. d. 15.5% 25.5% 2. The web-based client/server application model involves three new technologies, not including () A.C + + b.w.eb information service c.J AVA language d.N C 3. The following non-noise is () A. internal modulation noise b. Thermal noise c. Crosstalk d. Delayed deformation 4.100 BASE - T and 100VG - Any access control methods used on the MAC layer are () A.C SMA/CD, CSMA/CD b.d. PAM, DPAM c.sma/CD, DPAM d. PAM, CSMA/CD 5. The following are not the generating polynomials of international standard () A.C RC - ITU = X16 + + x 5 + 1 X12 biggest RC - 16 X16 + X15 + X2 = + 1 Arthur c. RC - 12 + + X2 X3 = X12 + X11 + X + 1, dc RC - = by 8 + 8 X7 + X + 1 6. Flow control is actually the right () A. Control of data traffic control of sender data C. Control of data flow of sender and receiver 7. For packet switching, the following conversion into a mathematical signal before transmission is () A. the b. the c. the b. the c. the d. the 8. It involves the physics, data link and network layer of the OSI reference model, without the other layers being () A. Gateway b. repeater c. Router d. bridge 9. What is wrong about the LAN and WAN claims is () A. At the rate, LAN is faster than WAN. In scope, LAN is smaller than WAN C. In terms of communication, LAN and WAN are the same. In error rates, LAN is smaller than WAN The most important service on the Internet is () A. file transfer b. electronic mail c. newsgroup d. wide-area information service 11. The following network operating system products can be used to construct peer-to-peer networks () A. Windows NT b. Windows 95 c.U NIX d.Net warre 12. CSMA/CD technology is only used for () A. total linear topological structure b. star topological struct