E1_11_4_3_3 - Network Latency Documentation with...

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View Full Document Right Arrow Icon Network Latency Documentation with Ping Topology Diagram Learning Objectives Use the ping command to document network latency. Compute various statistics on the output of a ping capture. Measure delay effects from larger datagrams. Background To obtain realistic network latency statistics, this activity must be performed on a live network. Be sure to check with your instructor for any local security restrictions against using the ping command on the network. The destination Server Computer must return ECHO replies, otherwise delay cannot be computed. Some computers have this feature disabled through a firewall, and some private networks block transit ECHO datagrams. For this experiment to be interesting, a sufficiently distant destination should be chosen. For example, destinations on the same LAN or within a few hops may return an unrepresentative low latency. With patience, a suitable destination will be found. The purpose of this lab is to measure and evaluate network latency over time, and during different periods of the day to capture a representative sample of typical network activity. This will be accomplished by analyzing the return delay from a distant computer with the ping command. Statistical analysis of throughput delay will be performed with the assistance of a spreadsheet application such as Microsoft Excel. Return delay times, measured in milliseconds, will be summarized with through computation of the average latency (mean), noting the latency value at the center of the ordered range of latency points (median), and identification of the most frequently occurring delay (mode). The Appendix contains a chart that can be submitted to the instructor when finished. Delay will also be measured when the ICMP datagram size is increased. All contents are Copyright © 1992–2007 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 1 of 9
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CCNA Exploration Network Fundamentals: Configuring and Testing Your Network Network Latency Documentation with Ping Scenario In the topology graphic above, the network cloud represents all of the network devices and cabling between the student computer and the destination Server Computer. It is normally these devices that introduce network latency. Network engineers routinely rely on networks outside of local administration for connectivity to external networks. Monitoring path latency does provide some measure of administrative diligence, which may be used in decision-making when evaluating suitable applications for wide area network (WAN) deployment. This activity will require five days of testing. On each day, three tests will be performed. Preferably, one test will be made in the early morning, one around mid-day, and one in the evening. The idea is to note and document latency differences that occur during the different periods of the day. When finished there will be a total of 15 sets of this data. To understand the delay effects from larger datagrams, ICMP datagrams will be sent with increasingly
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E1_11_4_3_3 - Network Latency Documentation with...

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