CHAPTER 2
The Physical Medium
Have you ever troubleshot a network issue for hours, racking your brain, only to find out that someone pulled a cable slightly out of the port? This chapter focuses on problems at layer 1—the physical layer—and how this layer is overlooked when network problems are experienced. A common example is a cable with a loose connection when troubleshooting another issue. I once left a network down for two days before actually looking at the port to determine the issue, which was a cable with a loose connection. It is very easy for you to blame your commercial carrier, but before you do so, you should exhaust all fault possibilities. ...
Get Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
