January 2021
Beginner
565 pages
19h 27m
English
Content preview from Fundamentals of Communications and Networking, 3rd Edition
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Network Troubleshooting Approach
The most logical network troubleshooting approach is to follow the OSI model from the bottom up. All network-related troubleshooting steps would follow the OSI model. This is called a process of elimination, in which you sequentially eliminate each layer of the OSI model where the problem may exist, as follows:
- Physical Layer—Is the cable cut? Did the electric power go out? With a Physical Layer issue, there is no network availability.
- Data Link Layer—For wired LANs, is there link integrity between the Ethernet network interface controller (NIC) and the Ethernet switch? Link integrity will be visibly shown as a green LED indicator. No link integrity is visibly shown as a dark LED indicator.
- Network Layer
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