7. [10 points] Consider the following network. Х у AS3 other networks other networks 10 1a 1b AS2 AS1 S10 a. [3 points] Describe how hierarchical routing (the combination of inter- and intra- AS routing) solves the problem of scale and flexible administration.
b. [2 point] Which of the routers are likely to run eBGP? C. [5 points] Assume that x is a customer of AS3 and y is a customer of AS2. Describe what is the customer-provider relationship between AS2 and AS1 and AS3 and AS1, so that traffic can flow between x and y.
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