UGC NET Computer Science December 2019 | Question 104

Question 104

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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

1. 1. 25
2. 2. 27
3. 3. 53
4. 4. 72

Answer :

Question 104 Explanation

Here In Routing table entries are according to 3-level Hierarchy.

All routers within the regions will store the address of all other routers. So total 10 entries.

Table entries will also include entries for all regions excepting itself. So, 8 entries will be there for Regions.

Table entries will also include entries for all clusters excepting itself. So, 7 entries will be there for Regions.

If a 3-level hierarchy used, with 8 clusters, each contains 9 regions and 10 routers/region.
Total Entries in Routing Table of Each router = 10 + 8 + 7 = 25 entries

So, option 1 is correct answer

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