Consider a subnet with 720 routers. If a three-level hierarchy is choosen with eight clusters, each containing 9 regions of 10 routers, then total number of entries in the routing table is __________.
Explanation: Eight clusters, each containing 9 regions of 10 routers is a 3 level hierarchy.
Each router needs 10 entries for local router, 8 entries for routing the other regions and for distant cluster it need 7 enrties.
i.e. total 10 + 8 + 7 = 25 entries.
So, option (A) is correct.
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