Cisco CCNA:Ethernet Cabling

Ethernet cabling is an important discussion, especially if you are planning on taking the Cisco CCNA exam. The types of Ethernet cables available are:

• Straight- through cable
• Crossover cable
• Rolled cable

We will look at each in the following sections.
Straight-Through Cable
The straight-through cable is used to connect

• Host to switch or hub
• Router to switch or hub

Four wires are used in straight-through cable to connect Ethernet devices.
Cross-over Cable
The cross-over cable can be used to connect

• Switch to switch
• Hub to hub
• Host to host
• Hub to switch
• Router direct to host

The same four wires are used in this cable as in the straight-through cable; we just connect different pins together.
Rolled Cable
Although rolled cable isn’t used to connect any Ethernet connections together, you can use a rolled Ethernet cable to connect a host to a router console serial communication (com) port.
If you have a Cisco router or switch, you would use this cable to connect your PC running Hyper Terminal to the Cisco hardware. Eight wires are used in this cable to connect serial devices, although not all eight are used to send information, just as in Ethernet networking.

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