Ccna routing and Switching Complete Study Guide

Crossover cable

Fa0/1

Fa0/0

Fa0/1

Straight-through cable

S1

S1

R1

R1

R2

R1

S1

S2

The crossover examples in Figure 2.12 are switch port to switch port, router Ethernet 

port to router Ethernet port, and router Ethernet port to PC Ethernet port. For the straight-

through examples I used PC Ethernet to switch port and router Ethernet port to switch 

port.

It’s very possible to connect a straight-through cable between two 

switches, and it will start working because of autodetect mechanisms 

called auto-mdix. But be advised that the CCNA objectives do not typically 

consider autodetect mechanisms valid between devices!

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Chapter 2 

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  Ethernet Networking and Data Encapsulation