Imagine two autonomous systems ASX and ASY, and assume all of the following: • ASY has been allocated a prefix P Y containing a host H's public IP address. • A router R resides within the domain of ASX. • ASX uses RIP for intra-AS routing, a shortest AS-PATH policy for inter-AS routing, and an intra-AS hot-potato policy to break AS-PATH ties for inter-AS routing. • ASX contain three gateways, G1, G2, and G3. • R has three interfaces, 11, 12, and 13, and entries (G1, 11) and (G2, 12), in its forwarding table. • G1 is fewer hops away than G2 along their respective shortest paths from R, though the path to G1 traverses an older set of links with lower average throughput. • At time Tj the only path to prefix P Y to have been advertised to ASX is ASB ASC ASY with NEXT-HOP address G7. Answer the question: a. If G7 has an inter-AS peering link with ASX only to G2, to which interface will R forward datagrams addressed to H?
Imagine two autonomous systems ASX and ASY, and assume all of the following: • ASY has been allocated a prefix P Y containing a host H's public IP address. • A router R resides within the domain of ASX. • ASX uses RIP for intra-AS routing, a shortest AS-PATH policy for inter-AS routing, and an intra-AS hot-potato policy to break AS-PATH ties for inter-AS routing. • ASX contain three gateways, G1, G2, and G3. • R has three interfaces, 11, 12, and 13, and entries (G1, 11) and (G2, 12), in its forwarding table. • G1 is fewer hops away than G2 along their respective shortest paths from R, though the path to G1 traverses an older set of links with lower average throughput. • At time Tj the only path to prefix P Y to have been advertised to ASX is ASB ASC ASY with NEXT-HOP address G7. Answer the question: a. If G7 has an inter-AS peering link with ASX only to G2, to which interface will R forward datagrams addressed to H?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Imagine two autonomous systems ASX and ASY , and assume all of the following:
• ASY has been allocated a prefix P Y containing a host H's public IP address.
• A router R resides within the domain of ASX.
• ASX uses RIP for intra-AS routing, a shortest AS-PATH policy for inter-AS routing, and an intra-AS hot-potato
policy to break AS-PATH ties for inter-AS routing.
• ASX contain three gateways, G1, G2, and G3.
• R has three interfaces, 1, 12, and 13, and entries (G1, 1) and (G2, 12), in its forwarding table.
• G1 is fewer hops away than G2 along their respective shortest paths from R, though the path to G1
traverses an older set of links with lower average throughput.
• At time Tj the only path to prefix P Y to have been advertised to ASX is ASB ASC ASY with NEXT-HOP address
G7.
Answer the question:
a. If G7 has an inter-AS peering link with ASX only to G2, to which interface will R forward datagrams
addressed to H?
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