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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. The key to SNMP (76) is its simplicity. It has a small command set that does a good job of collecting information from (77) any network device. In a SNMP environment, (78) of the work is handled by the network management system. Devices that are being managed are not (79) with processing (80) that might affect their performance.
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In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Microwave communication uses high-frequency (26) waves that travel in straightlines through the air. Because the waves cannot (27) with the curvature of the earth, they can be (28) only over short distance. Thus, microwave is a good (29) for sendingdata between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (30) . These can be installed on towers, high buildings, and mountain tops.
Frame Relay is simplified form of (51) , similar in principle to (52) , in which synchronous, frames of data are routed to different destinations depending on header information. Packets are routed throught one or more Virtual Circuits known as (53) . Most Virtual Circuits are (54) , which means that the network provider sets up all DLCI connections at subscription time. (55) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.
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. The key to SNMP (76) is its simplicity. It has a small command set that does a good job of collecting information from (77) any network device. In a SNMP environment, (78) of the work is handled by the network management system. Devices that are being managed are not (79) with processing (80) that might affect their performance.
(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.
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