Question: Consider the network below. Suppose that AS1 and AS2 are running OSPF and AS3 and AS4 are running RIP for their intra-AS routing protocol respectively.

Consider the network below. Suppose that AS1 and AS2 are running OSPF and AS3 and AS4 are running RIP for their intra-AS routing protocol respectively. Suppose that eBGP and iBGP are used for the inter-AS routing protocol. All link costs in the network are assumed to be 1. Initially suppose there is no physical link between AS2 and AS4. (1) Each of the following routers learns about prefix X directly from which routing protocol: OSPF, RIP, eBGP or iBGP (only one of them)? lc, Id, 2b, 2c, 3b, 3c, 4a, 4c (2) Once router Id learns about X and Y, it will put two entries (X, l_x) and (Y, l_y) in its forwarding table. (A) Will 1_x be set l_1 or l_2? (B) Now suppose that there is a physical link between AS2 and AS4, shown by the dotted line. Suppose router ld learns that X is accessible via AS2 as well as via AS3. Will l_x be set to l_x or l_2? Will l_y be set to l_1 or l_2? Consider the network below. Suppose that AS1 and AS2 are running OSPF and AS3 and AS4 are running RIP for their intra-AS routing protocol respectively. Suppose that eBGP and iBGP are used for the inter-AS routing protocol. All link costs in the network are assumed to be 1. Initially suppose there is no physical link between AS2 and AS4. (1) Each of the following routers learns about prefix X directly from which routing protocol: OSPF, RIP, eBGP or iBGP (only one of them)? lc, Id, 2b, 2c, 3b, 3c, 4a, 4c (2) Once router Id learns about X and Y, it will put two entries (X, l_x) and (Y, l_y) in its forwarding table. (A) Will 1_x be set l_1 or l_2? (B) Now suppose that there is a physical link between AS2 and AS4, shown by the dotted line. Suppose router ld learns that X is accessible via AS2 as well as via AS3. Will l_x be set to l_x or l_2? Will l_y be set to l_1 or l_2
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