Consider a subnet with 720 routers. If a three- level hierarchy is chosen, with eight clusters, each containing 9 regions of 10 routers, then total number of entries in hierarchical table of each router is
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Correct answer: A. 25
Explanation
Each router keeps 10 entries for routers in its own region, 8 for the other regions in its cluster, and 7 for the other clusters: 10 + 8 + 7 = 25.
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