Question: Consider the network in 9.2.1.1 Split Horizon:, using distance-vector routing updates. B and Cs table entries for destination D are shown. All link costs are

Consider the network in 9.2.1.1 Split Horizon:, using distance-vector routing updates. B and Cs table entries for destination D are shown. All link costs are 1.

Suppose the DA link breaks and then these update reports occur:

A reports D, to B (as before)

C reports D,2 to B (as before)

A now reports D, to C (instead of B reporting D,3 to A)

(a). Give A, B and Cs forwarding-table records for destination D, including the cost, after these three reports.

(b). What additional reports (a pair should suffice) will lead to the formation of the routing loop?

(c). What (single) additional report will eliminate the possibility of the routing loop?

C (D,A,2)

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