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It is used for routing the packets hierarchically and it is designed for the following Reasons:

1)Routers need more memory space to store the routing tables.

2)More CPU time needed to scan table.

3)More Bandwidth required to send the scanned report.

So this routing algorithm divides the router into number of routers called regions and maintain tables for them to decrease the size.

this is done in TELEPHONE SYSTEM.

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