Computer Network Unit 1 q what are the topologies in computer n/w ?

1.PERSONAL AREA NETWORK-The interprocessor distance is 1 meter and the processors are located within a square meter.

2.LOCAL AREA NETWORK(LAN)-The interprocessor distance is 10 meters to 1 kilometer and the processors are located in a room or a building or a campus.

3.METROPOLITAN AREA NETWORK(MAN)-The interprocessor distance is 10 kilometers and the processors are located in a city.

4.WIDE AREA NETWORKS(WAN)-The interprocessor distance is from 100 kilometers to 1000 kilometers and the processors are located in a country or a continent.

5.INTERNETWORKS-The interprocessor distance is 10,000 kilometers and a popular example is the INTERNET. 



Q 10. Comparison between OSI and TCP/IP model
Ans:

Sr.No.	OSI	TCP/IP
1.	he OSI model originally distinguishes between service,interval and protocols.	The TCP/IP model doesnt clearly distinguish between service,interval and protocol.
2.	The OSI model is a reference model.	The TCP/IP model is an implementation of the OSI model.
3.	In OSI model,the protocols came after the model was described.	In TCP/TP model,the protocols came first,and the model was really just a description of the existing protocols.
4.	In OSI model,the protocols are better hidden.	In TCP/IP model ,the protocols are not hidden.
5.	The OSI model has 7 layers.	The TCP/IP model has only 4 layers.
6.	The OSI model supports both connectionless and connection-oriented communication in the network layer,but only connection -oriented communication in transport layer.	The TCP/IP model supports both connectionless and connection-oriented communication in the transport layer.,giving users the choice

OSI TCP/IP