（15）Basics of Opnet IT Guru Academic Edition（Opnet教学版实验说明介绍）

OPNET's IT Guru provides a Virtual Network Environment that models the behavior of your entire network, including its routers, switches, protocols, servers, and individual applications. By working in the Virtual Network Environment, IT managers, network and system planners, and operations staff are empowered to diagnose difficult problems more effectively, validate changes before they are implemented, and plan for future scenarios including growth and failures.

OPNET's Applicaton Characterization Environment (ACE) module for IT Guru enables enterprises to identify the root cause of end-to-end application performance problems and to solve them cost-effectively by understanding the impact of changes.

In this lab, you will learn the basics of the OPNET IT Guru Academic Edition software. You will learn how to setup and run Opnet IT Guru Academic Edition. You will become familiar with some of its preferences and will practice using the software by running some tutorials.

1. Visit the following site to register with OPNET technology, and then you can download OPNET IT Guru Academic Edition release 9.1.
http://www.opnet.com/itguru-academic/mk-setup.html

2. System Requirements:

- Intel Pentium III, 4 or compatible (500 MHz or better);
- 256MB RAM;
- 400MB disk space(free);
- Display: 1024*768 or higher resolution, 256 or more colors;
- The English language version of the following operating systems are supported:
* Microsoft Windows NT (service Pack 3, 5, or 6a; Service Pack 4 and 6 are not supported);
* Windows 2000 (Service pack 1 and 2 are supported but not required);
* Windows XP (Service Pack 1 is required);

3. Install and Start OPNET IT Guru Academic Edition:
Read the Restricted Use Agreement and click I have read this SOFTWARE AGREEMENT and I understand and accept the terms and conditions described herein.
Then you can see the starting window of Opnet.

4. Check the OPNET preferences:
The Opnet Preferences let you display and edit environment attributes, which control program operation. In this eg. lab you will check three of those environment attributes.
* After starting Opnet, from the Edit menu, choose Preferences.
* The list of environment attributes is sorted alphabetically according to name. You can locate attributes faster by typing and part of the attribute's name in the Find field.
* Check the value of the license_server attribute. It has the name of the License Server's host. If IT Guru is getting its license from the local host (i.e., the computer on which the software was installed), the value of license_server should be localhost.
* Set the license_server_standalone attribute to TRUE. This attribute specifies whether the program acts as its own license server.
* A model directory is a directory that contains OPNET model files. If the directory is listed in the mod_dirs environment attribute, then OPNET programs will use the models in that directory. Check the value of the mod_dirs attribute. The first directory in the list is where your own models will be saved. In the future you might need to access that directory to back up, copy, or move your models.

5. Run the Introduction Tutorial:
From the help menu, select Tutorial. Go over the Introduction lesson from the list of Basic Lessons.

6. Run the Small Internetwork Tutorial:
From the Help menu, select Tutorial. Carry out the Small Internetworks tutorial from the list of Basic Lessons.
* You can modify the nodes with a more number ( like with 30 nodes in the second floor instead of 15 nodes). And run the simulation and compare the load and delay graphs of the new scenario with the corresponding graphs of the First_floor and expansion scenarios.

7. Make your Lab Report like this:
The laboratory report of this lab (and all the following labs in this manual) should include the following items/sections:
- A cover page with your name, course information, lab number and title, and date of submission.
- A summary of the addressed topic and objectives of the lab.
- Implementation: a brief description of the process you followed in the conducting the implementation of the scenarios.
- Results obtained throughout the lab implementation, the analysis of these results, and a comparison of these results with your expectations.
- Answers to the given questions at the end of the lab. If an answer incorporates new graphs, analysis of these graphs should be included here.
- A conclusion that includes what you learn, difficulties you faced, and any suggested extensions/improvements to the lab.

PS: At last I make a Template for MS-Word of the lab Report, If some one need it, pls leave message.