Last Updated : 10 Dec, 2018

Consider the given subnet:
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The measured delay of O to M, P and R are 1, 5, 2 respectively. O has received following distance vector from node M;(0, 1, 4, 7, 2, 5), P:(4, 3, 1, 0, 2, 8) and R:(6, 2, 8, 1, 2, 0).
Which of the following is the correct routing table for O?
(A)

To Via Distance
M P 1
N M 2
O O 1
P R 2
Q P 4
R M 2

(B)

To Via Distance
M M 1
N M 2
O – –
P O 3
Q M 3
R R 2


(C)

To Via Distance
M R 2
N N 1
O – 0
P P 1
Q M 1
R N 2

(D)

To Via Distance
M R 2
N N 1
O N 1
P R 1
Q P 2
R M 2


Answer: (B)

Explanation: Routing table of O via M:(1, 2, 5, 8, 3, 6)
Routing table of O via P:(9, 8, 6, 5, 7, 13)
Routing table of O via R:(8, 4, 10, 3, 4, 2)
Final Table:

To Via Distance
M M 1
N M 2
O – –
P O 3
Q M 3
R R 2


So, option (B) is correct.

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