ISRO2007-26

Question

If there are five routers and six networks in intranet using link state routing, how many routing tables are there?

• A. $1$
• B. $5$
• C. $6$
• D. $11$

Answer 1

Answer is (B) 5.

Routers have routing table. So there will be 5 routing tables each having 6 entries.

Comments

please explain what will be the default entry??

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suppose one or two additional hosts(computers) are connected then we count the routing table at hosts or not??

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The entries will be 6 because there are 6 networks.The routing table at each of the the 5 routers will contain the shortest path to every other network including itself which will always be 0.

Answer 2

Always remember ;;Number of routing table at router always equal to number of router in the network.

So Ans will be ::5

Answer 3

Option B

Routers have routing tables to transmit packets selectively to other networks. These routers apply shortest path algorithms to choose the links on which, a packet is to be forwarded, so that it can reach the destination in covering minimum number of hops.
If there are 5 routers, then there should be 5 routing tables as well.