Nov 3, 2011

Abstract of CCNA study guide-4 - internetworking 4

Continue the series of  Abstract CCNA study guide book .
Ethernet Cabling

Three types of Ethernet cables are available:
- Straight-through cable
- Crossover cable
- Rolled cable
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.
Next Figure shows the four wires used in a straight-through Ethernet cable.
Notice that only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6 .
Crossover Cable
The crossover 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 connect pins 1 to 3 and 2 to 6 on each side of the cable.
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 HyperTerminal to the Cisco hardware. Eight wires are used in this cable to connect serial devices.
Once you have the correct cable connected from your PC to the Cisco router or switch, you can start HyperTerminal to create a console connection and configure the device. Set the configuration as follows:
1. Open HyperTerminal and enter a name for the connection.
2. Choose the communications port—either COM1 or COM2.
3. Now set the port settings. The default values (2400bps and no flow control hardware) will not work;

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