Question

This problem is about query flooding in p2p networks . Here we explore. the reverse path. routing of the. query hit messages. in Gnutella. Suppose that alice issues. a query message. . Furthermore. suppose that Bob receives the query message (which may have been forwarded by several intermediate peers) and has a file that matches the query . (1) As we know that when a peer has a matching file it sends a query hit message along the reverse part of the corresponding query message. An alternative design would be for bob to establish a direct TCP connection with alice and send the query hit message over this connection. What are the advantages and disadvantages of such alternative design? (2) In the gnutella protocol , when the peer alice creates a query message, it inserts a unique ID in the message's message ID field . When the peer bob has a match it generates a query hit message using the same message ID as a query message . Describe how can peers use the message ID field and local routing tables to accomplish reverse path routing. (3) An alternative approach which does not use message identifiers it as follows .when a query message reaches the peer before forwarding the message , the peer arguments the query message with its IP address . Describe how peers can use this mechanism to accomplish reverse path routing.

Answer 1

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Explanation:

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