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Computer Networks
Hierarchical Routing
Q
A network with two level hierarchy has total of 1600 routers and got divided into some parts, a router in the first part which consists of 500 routers has 503 entries in it. The second part and third part have routers with 303 and 603 entries respectively. What is the total no of regions in the network and how many routers are present in each part?
AA. 4; 500, 300, 600, 200
BB. 5; 400, 500, 200, 100, 400
CC. 3; 500, 600, 500
DD. 4; 500, 300, 500, 300
Correct Answer:
A. A. 4; 500, 300, 600, 200
Explanation:
Network has two level hierarchy and router in the first part has 3 extra entries more than the number of routers in that part. This indicates that the network has divided into 4 parts. After subtracting 500, 300 and 600 from 1600, we get 200 routers in the last part.
