TAILIEUCHUNG - TCP/IP Sleuthing – Troubleshooting TCP/IP Using Your Toolbox

You just received another late evening page from the help desk. “I have a problem with my network access, it just doesn’t work!” What should you do next? Troubleshoot! Troubleshooting is a necessary part of supporting any network installation. Determining and repairing problems can consume a lot of time, especially if you don’t know what to do or how to do it correctly and quickly. In this paper, I will explain how you might consider troubleshooting different problems that could exist in your network. These techniques can all be performed using some of the common tools available in modern operating systems | Global Knowledge Expert Reference Series ofWhite Papers TCP IP Sleuthing Troubleshooting TCP IP Using Your Toolbox 1-800-COURSES TCP IP Sleuthing Troubleshooting TCP IP Using Your Toolbox Ted Rohling Global Knowledge Instructor CISSP Introduction You just received another late evening page from the help desk. I have a problem with my network access it just doesn t work What should you do next Troubleshoot Troubleshooting is a necessary part of supporting any network installation. Determining and repairing problems can consume a lot of time especially if you don t know what to do or how to do it correctly and quickly. In this paper I will explain how you might consider troubleshooting different problems that could exist in your network. These techniques can all be performed using some of the common tools available in modern operating systems. The more you know about these tools the better you can use them to fix your problems. Methodology Required Effective troubleshooting requires the use of a methodology. Without a methodology you still may be able to successfully troubleshoot some problems. But other problems may be hidden because you have not considered all of the possibilities. You may already have a favorite method for troubleshooting. If it works use it. You might also wish to consider another approach. One method that has worked successfully is the use of the OSI model for problem determination. The OSI model is describes the data communication processes. The model consists of seven different layers. Each layer has a given set of responsibilities in the communication process. The seven layers are as follows Layer 7 Application Layer 6 Presentation Layer 5 Session Layer 4 Transport Layer 3 Network Layer 2 Data Link Layer 1 Physical Information flows from layer 7 the application layer down through to layer 1 where it is placed on the physical network circuits. After it arrives at the next device it will flow up and down the layers as .

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