Question

Routing in Practice (30 points). For each of the statements below, decide which it is true or false, and briefly justify your answer. a. For an autonomous system (AS), Link State Routing is a better choice (than Distance Vector Routing) for intra-domain routing within the AS since it is simpler to implement. b. Consider a gateway router in an AS. After receiving multiple advertisements, the router uses BGP to decide the best path to a destination. c. In BGP, policy is more important than performance when making routing decisions. In OSPF, performance is more important than policy.

Answer 1

Answer:

a. false

b. true

c. false

Explanation:

a. False, for intra-domain routing distance vector protocol is simple to implement and because all the links have same speed, distance vector routing is better to use. Distance sector routing is simple and least cost-effective than link state routing.

b. True BGP stands for Broader Gateway Protocol and in AS, router uses BGP to decide the best path among multiple possible paths.

c. False, in BGP performance is more important than policy and hence BGP make decision based on shortest path from source to destination while OSPF uses Dijkstra algorithm to decide the shortest path and then works on this policy.