2. [Intra-Domain Routing] (12 marks) a) (6 marks) So far in this lecture series, for intra domain routing scenarios, we have assumed that the shortest path is the least cost path where cost may be defined in terms of number of hops, delay etc. This scheme simply builds the overall cost of a path by adding individual link costs along the path until all links for the path are considered. There are many networking environments in which this strategy of selecting the best path using least cost is not applicable. Identify and explain one scenario where this routing strategy may not work. (200 words)