Saturday 14 January 2012
COMPUTER NETWORKS QUESTIONS AND ANSWERS - IV
UNIT-III
1. Define packet switching?
A packet switch is a device with several inputs and outputs leading to and from the hosts that the switch interconnects.
2. What is a virtual circuit?
A logical circuit made between the sending and receiving computers. The connection is made after both computers do handshaking. After the connection, all packets follow the same route and arrive in sequence.
3. What are data grams?
In datagram approach, each packet is treated independently from all others. Even when one packet represents just a place of a multi packet transmission, the network treats it although it existed alone. Packets in this technology are referred to as datagram.
4. What is meant by switched virtual circuit?
Switched virtual circuit format is comparable conceptually to dial-up line in circuit switching. In this method, a virtual circuit is created whenever it is needed and exits only for the duration of specific exchange.
5. What is meant by Permanent virtual circuit?
Permanent virtual circuits are comparable to leased lines in circuit switching. In this method, the same virtual circuit is provided between two uses on a continuous basis. The circuit is dedicated to the specific uses.
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