Content

| 4.1 |  | Characteristics of Data Link Layer Problems |
| 4.1.1 |  | Data link layer problems overview |

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 in general.

| Lab Activity 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.