[Solved]-Question 1 15p Consider Network Shown Ases B C Routers Labeled Al A2 Etc Ases Connected I Q37266891
Question 1 (15p) Consider the network shown below, with ASes A, B, and C. Each AS has some routers (labeled as Al, A2 etc.). The ASes are connected internally, and between each other by links as shown in the figure. Assume that eBGP and iBGP are used for inter-AS routing, and that ASes B is using RIP for intra-AS routing while ASes A and C are using OSPF for intra-domain routing. A subnet with prefix x is connected to an interface on router C3.) B2 B1 C2 A3 AS A H1 C4 AS C A2 C3 A4 C1 H2 a) From which routing protocols does router A2, B2, and C2, learn about prefix x, respectively? b) From which routing protocol does router A3 learn how to reach router A2? Which layer carries this c) Suppose host H2 has the IP address of 207.96.19.3, and is directly connected to router A4 as shown in Your answer to each of them should be one of fiBGP, eBGP, RIP, OSPF). Similarly for b,) message the figure. What do we know about router A4’s address? Hint: IP address 207.96.19.3 is an IP address, which means the prefir of the subnet is 207.96.19.0/24, d) Suppose AS A contains 20 subnets, AS B contains 10 subnets, and AS C contains 15 subnets. Further suppose there are no other ASes connected to this network. How many entries are there in router A2’s forwarding table? How many entries are there in router B3’s routing table1 e) With BGP alone (no complex firewall settings), can the operator or ISP of AS A implement a policy to direct all of its outgoing traffic to not go through AS B? Why or why not? Can the operator of AS B implement a policy to decline any traffic from AS A, without affecting the traffic (from other ASes through B) to AS A? Why or why not? Show transcribed image text Question 1 (15p) Consider the network shown below, with ASes A, B, and C. Each AS has some routers (labeled as Al, A2 etc.). The ASes are connected internally, and between each other by links as shown in the figure. Assume that eBGP and iBGP are used for inter-AS routing, and that ASes B is using RIP for intra-AS routing while ASes A and C are using OSPF for intra-domain routing. A subnet with prefix x is connected to an interface on router C3.) B2 B1 C2 A3 AS A H1 C4 AS C A2 C3 A4 C1 H2 a) From which routing protocols does router A2, B2, and C2, learn about prefix x, respectively? b) From which routing protocol does router A3 learn how to reach router A2? Which layer carries this c) Suppose host H2 has the IP address of 207.96.19.3, and is directly connected to router A4 as shown in Your answer to each of them should be one of fiBGP, eBGP, RIP, OSPF). Similarly for b,) message the figure. What do we know about router A4’s address? Hint: IP address 207.96.19.3 is an IP address, which means the prefir of the subnet is 207.96.19.0/24, d) Suppose AS A contains 20 subnets, AS B contains 10 subnets, and AS C contains 15 subnets. Further suppose there are no other ASes connected to this network. How many entries are there in router A2’s forwarding table? How many entries are there in router B3’s routing table1 e) With BGP alone (no complex firewall settings), can the operator or ISP of AS A implement a policy to direct all of its outgoing traffic to not go through AS B? Why or why not? Can the operator of AS B implement a policy to decline any traffic from AS A, without affecting the traffic (from other ASes through B) to AS A? Why or why not?
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Answer to Question 1 (15p) Consider the network shown below, with ASes A, B, and C. Each AS has some routers (labeled as Al, A2 et… . . .
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