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…
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........
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Correct answer: (A) 25
Explanation
With eight clusters, each containing 9 regions of 10 routers, each router needs 10 entries for local routers, 8 entries for the other regions in its own cluster and 7 entries for the distant clusters: total 10 + 8 + 7 = 25.