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December2015 cs Q12

0. Consider a subnet with 720 routers. If a three-level hierarchy is chosen with eight clusters, each containing 9 regions of 10 routers, then the total number of entries in the routing table is __________.

  • Option : A
  • Explanation : Eight clusters, each containing 9 regions of 10 routers is a 3 level hierarchy. Each router needs 10 entries for the local router, 8 entries for routing the other regions, and for distant clusters it needs 7 entries. i.e. total 10 + 8 + 7 = 25 entries. So, option (A) is correct.
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