December 1999
AN215 : ADVANCED NETWORKING

QUESTION 5

Total Marks: 15 Marks

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for Question 5

Local area networks can be connected together using devices such as bridges,routers,or gateways.The choice of which form of connection to use will depend on the nature of the networks involved.
(a)

For each of the three devices mentioned above,state at which level(s)of the OSI model it operates,giving reasons for your answers.

[6]
(b)

A bridge may be used to divide a LAN into several interconnected LANs.Describe three reasons for using a bridge in this way.

[6]
(c)

For each of the following situations,state which means of connection would be the most appropriate.

(i)The connection between a training company ’s backbone ethernet network and the sub-network (a segment)used in a particular computer laboratory.[1 mark ]

(ii)The connection between a company ’s private network and the Internet. [1 mark ]

(iii)The connection between the company ’s network and a special proprietary network used in the headquarters,which is incompatible.[1 mark ]

[3]