OPNET PROJECT 2 - John Jenkins CIT 372 OPNET Project 2...

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John Jenkins CIT 372 OPNET Project 2 Network Application Performance Analysis May 7, 2007 Topic: o Analysis of the FTP application performance under varying network conditions.
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Objectives: o To chart and compare network performance while using an FTP application and analyze the congestion, or bottlenecks, under various network conditions including latency, limited bandwidth, background traffic and packet loss with retransmission. Implementation: o The model was implemented using the OPNET Application Characterization Environment (ACE), which incorporates a packet capture file named FTP_with_loss which was downloaded from a live network. This file traffic is viewed in the Data Exchange Chart as “Application Only” (see figure 2-1), “Network Only” (see figure 2-2) or as “Application and Network” (see figure 2-3). The ACE environment also allows for a zoomed in view of the traffic as shown in figures 2-4 and 2-5. These charts show a snapshot of the 36 seconds of FTP traffic from the period of 25.2 seconds to 25.5 seconds. Figure 2 -
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Figure 2 - Figure 2 -
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Figure 2 - Figure 2 - o The file was captured on a real network over a 768 Kbps Frame Relay circuit with 36 ms of latency and took 36 seconds to download; An increase of over 300% of the nominal threshold of about 11 seconds. o A project was created in OPNET to incorporate this file capture (FTP_with_loss) into a network simulation scenario named “ManyUsers” (see figures 2-6 and 2-7). This model created a LAN of 100 users in which the client node would reside, added a packet latency of 40 milliseconds (figure 2- 8), and uses a 10baseT connection from the LAN to the FTP server with intervening switches and routers at each end. This topology is shown in figure 2-9.
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o The ManyUsers scenario ran for 2 minutes and 39 seconds to simulate 1 hour of real-time network activity (See figure 2-10) and the results were charted (figure 2-11) to analyze Application Response Time (ART) in seconds. Figures 2 – 6 and 2 - 7 Figure 2 – 8
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Figure 2 – 9 Figure 2 - 10 Results: o As figure 2-11 shows, the ART, over the period of one hour of network activity, becomes very slow (31 seconds) during the period of time of the download via the FTP application. This shows the inefficient nature of the FTP application/protocol as a download utility. The major reason for this
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OPNET PROJECT 2 - John Jenkins CIT 372 OPNET Project 2...

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