Netw410 Week 1 Lab Report

1042 words 5 pages
Lab 1: OPNET LAN Modeling Tutorial

Week 1 iLab Report
The first objective in the LAN Modeling tutorial is Setting Up the Scenario. The final step in setting up your scenario appears below. 1. (30 points) Once your project is created (after Step 6 above), your workspace will contain a map of the United States. Your project and scenario name can be seen in ITGuru’s top window border in the form of Project: Scenario: .

Capture a screenshot of your new project workspace that clearly shows your project and scenario name, and paste it below.

2. (40 points) In college-level paragraph(s), describe how background traffic affects both e-mail data and VoIP data.
INTRODUCTION
In this week’s lab exercise, we had the
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Figure 5 - Email Download Response Time (sec)

BACKGROUND LINK LOAD
Impact on Voice Traffic As with the FTP and email simulations, the topology was updated to include Voice Over IP (PCM Quality) followed by running new simulations for both scenarios. In this run, we continue to look at point to point throughput and point to point utilization. Additionally, we measured packet end to end delay (seconds). Without the use of other voice configuration metrics such as codec selection and quality of service for voice packets, in either scenario voice over IP fails as a result of the high packet delay. The chart below illustrates that the no background load simulation provides better performance for voice packets with an average delay of about 7 seconds. Alternatively, the simulation including background load produced an average packet delay of roughly 8 seconds. Figure 6 - Voice Packet End to End Delay (sec)

When looking at link utilization metrics, on the other hand, there does not appear to be a significant difference between the background load simulation and the no background load simulation. Figure 7 below indicates that, with the exception of the simulation startup being pre-loaded with 19,200 kbps in background load, both scenarios show a sharp ramp up over the first 8 minutes before leveling off at just over 60kbps. Link utilization, illustrated in figure

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