福师《计算机网络与通讯》在线作业二(第4次)（国外英文资料）.docVIP

福师《计算机网络与通讯》在线作业二(第4次)（国外英文资料） Fushi computer network and communication A, single topic selection In terms of switching technologies, Ethernet in a LAN USES () A. packet switching B. circuit switching technology C. message exchange technology D. packet switching and circuit switching Correct answer: a. 2. In the location of the terminal opposite concentration can increase () with various terminal for low speed line connection, data collection terminal, then transmitted to the host by high-speed lines. A. the terminal concentrator Front-end processing C. the router D. the gateway Correct answer: a. Using CSMA/CD Ethernet, () A. all sites listen to conflicts B. only the sites that are sent listen to the conflict C. listen to the conflict and immediately drop the data frame and do no retry D. listen to the conflict and continue to send the following parts of this data frame Correct answer: B The advantage of the technology is that the asynchronous transmission mode maximizes the performance of the () technology. Circuit switching B. article exchange C. message exchange and circuit switching D. circuit switching and packet switching Correct answer: D What is incorrect in the following statement is (). The bandwidth of A single mode fiber is more than the bandwidth of multimode fiber The transmission rate of the data transfer rate for two stranded wires (STP) is higher than that of non-screened double stranded cable (UTP) Coaxial cables are generally applied to the bus topology, and the double stranded wires are applied to the star topology D. 50 Ω fine coaxial cable transmission distance of more than 50 Ω thick coaxial cable transmission distance Correct answer: D There are different ways of transferring data between a wide range of computer networks. Baseband transmission Band transmission Broadband transmission D. All three of them Correct answer: D The following software () is E-mail software. A. Visual Basic B. Netscape C. Outlook Express D. the Internet Explorer Co