computer network

10. An Autonomous System (AS) is a collection of routers in a region with the same administration domain. (3%+49+1+3)+24(1-2)%) Consider the network shown below. Suppose that all ASs are running OSPF as the intra-domain routing protocol, and BGP (BGP/IBGP) as for the inter domain routing protocol. Initially, suppose there is no physicallink between A53 and 54 A$4 41 Green s10 Slovo 20 2b AS2 ASI 10 S (a) Briefly explain why Internet are divided into Ass. (b) Explain how za knows it can reach AS4 via 2c (You need to mention the routers that help to disseminate the routine information and what protocols are used by the routers.) (c) Show the entry in the forwarding table of 2a for the route to AS4. Explain how Za derives the entry. (You can represent the value of the entry as (destination(Asi), interface(router name)]. You also need to mention what protocols are used. ) Suppose now there is a link between AS3 (3a) and AS4 (4a). At some time, id Inows it can reach A54 via both 1b (through AS3) and Ic (through AS2). Further suppose that cald, la) = 10, cf1d, 1b) = 12, d.(AS4) = 60, di(AS4) = 40. (d) What is Hot Potato Routing? le) Show the entry in the forwarding table of ld for the route to AS4 if id adopts Hot Potato Routing. Do you think this is a good policy