1. Propose a lookup algorithm for an IP forwarding table containing prefixes of varying lengths that does not require a linear search of the entire table to find the longest match.
2. Consider the network shown in Figure 4.29, in which horizontal lines represent transit providers and numbered vertical lines are interprovider links.
(a) How many routes to P could provider Q’s BGP speakers receive?
(b) Suppose Q and P adopt the policy that outbound traffic is routed to the closest link to the destination’s provider, thus minimizing their own cost. What paths will traffic from host A to host B and from host B to host A take?
(c) What could Q do to have the B→A traffic use the closer link 1?
(d) What could Q do to have the B→A traffic pass through R?
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