题目内容
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Open Shortest Path First (OSPF) is a (36) routing algorithm that (37) work clone on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (38) processing power. The (39) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (40) at regular intervals.
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For each blank, choose the best answer from the four choices and write down on the answer sheet. (21) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication. (22) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols. (23) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands. (24) is the popular LAN developed under the direction of the IEEE802.5. (25) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.
Packet-switching wireless networks are preferable (41) when transmissions are (42) because of the way charges are (43) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (44) for the (45) of time they use the net-work.
(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string. (57) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection. (58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable. (59) is a device used to connect two separate network that use different communication protocol. (60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.
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