O'Reilly logo

Sams Teach Yourself Network Troubleshooting in 24 Hours, Second Edition by Jonathan Feldman

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Routers Versus Switches

“Turn on the wayback machine, Sherman.” Remember Hour 2, “The OSI Model of Networking: Understanding the Old School,” where we discussed the difference between OSI layers? Sure; OSI layer 1 is physical, layer 2 is data link, layer 3 is network, and so on. The reason I bring this up is because the fundamental difference between a router and a switch is which OSI layer they operate on. (See Hour 10, “Ethernet and Switching,” if you want a refresher on exactly what a switch does.)

That is, a switch is a data link device—it is specific to the type of interface device that is being used (for example, Ethernet or FDDI), and deals with MAC addresses and frames as the most complex form of addressing (00:02:50:50:82:a5). A router ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required