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Computer Networking Interview Questions and Answers

Ques 41. What is logical link control?

Ans. One of two sublayers of the data link layer of OSI reference model, as defined by the IEEE 802 standard. This sublayer is responsible for maintaining the link between computers when they are sending data across the physical network connection.

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Ques 42. What is virtual channel?
Ans. Virtual channel is normally a connection from one source to one destination, although multicast connections are also permitted. The other name for virtual channel is virtual circuit.
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Ques 43. What is virtual path?
Ans. Along any transmission path from a given source to a given destination, a group of virtual circuits can be grouped together into what is called path.
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Ques 44. What is packet filter?
Ans. Packet filter is a standard router equipped with some extra functionality. The extra functionality allows every incoming or outgoing packet to be inspected. Packets meeting some criterion are forwarded normally. Those that fail the test are dropped.
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Ques 45. What is traffic shaping?
Ans. One of the main causes of congestion is that traffic is often busy. If hosts could be made to transmit at a uniform rate, congestion would be less common. Another open loop method to help manage congestion is forcing the packet to be transmitted at a more predictable rate. This is called traffic shaping.
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