A user complains that their web application Times Out after successfully connecting to a remote host,...

Transcribed Image Text:

A user complains that their web application Times Out after successfully connecting to a remote host, yet, an investigation with ping indicates the remote host is alive. Propose a cause of this fault and outline a test-strategy that could be used automatically to detect such a fault. (b) A user would like to infer the path between two hosts; they suggest using the utility ping. Make your argument for why traceroute is the more appropriate utility, comparing and contrasting their operation. (c) Consider the test network below; Y and Z are two unix IPv4 hosts, while nodes A through E represent fully-conformant IPv4 routers providing the only connectivity between the two hosts. Z Per-packet load balancing by A and E means packets may be sent on any valid path. No firewalls or packet filtering is used anywhere in the network. (i) Using traceroute infers the following paths: (Y-A-B-C-E-Z). (Y-A-D-E-Z), (Y-A-B-D-E-Z), and (Y-A-B-E-E-Z) Explain (with diagrams as appropriate) why these results have occurred and identify the two true and two false results: (ii) A firmware upgrade for routers A and E means they now do per-flow and not per-packet load balancing. Despite the functions of the flow-based load balancing, traceroute results have not changed; two false paths are inferred along with two true paths. 1. din A user complains that their web application Times Out after successfully connecting to a remote host, yet, an investigation with ping indicates the remote host is alive. Propose a cause of this fault and outline a test-strategy that could be used automatically to detect such a fault. (b) A user would like to infer the path between two hosts; they suggest using the utility ping. Make your argument for why traceroute is the more appropriate utility, comparing and contrasting their operation. (c) Consider the test network below; Y and Z are two unix IPv4 hosts, while nodes A through E represent fully-conformant IPv4 routers providing the only connectivity between the two hosts. Z Per-packet load balancing by A and E means packets may be sent on any valid path. No firewalls or packet filtering is used anywhere in the network. (i) Using traceroute infers the following paths: (Y-A-B-C-E-Z). (Y-A-D-E-Z), (Y-A-B-D-E-Z), and (Y-A-B-E-E-Z) Explain (with diagrams as appropriate) why these results have occurred and identify the two true and two false results: (ii) A firmware upgrade for routers A and E means they now do per-flow and not per-packet load balancing. Despite the functions of the flow-based load balancing, traceroute results have not changed; two false paths are inferred along with two true paths. 1. din

Answer rating: 100% (QA)

Solution a The users web application may be timing out due to a number of reasons including A slow or congested network connection A firewall blocking ... View the full answer