Data link layer problems have common symptoms that assist in identifying
Layer 2 issues. Recognizing these symptoms will help the troubleshooter narrow
down the number of possible causes of a problem.
Before examining
the individual protocols and their unique characteristics, it is helpful to
know the symptoms that are associated with data link layer problems.
Lab
Exercise: Isolating Physical and Data Link Layer Problems
After
completing this lab, the student will be able to analyze user feedback and
end-system data to decide at which OSI layer to begin isolating problems.