what is ethernet in networking for basic CCNA configuration

Types of Twisted-Pair Cables
Various types of twisted-pair cables can be used. A straight-through cable
is used in the following circumstances:
• From a host to a hub (or switch)
• From a router to a hub (or switch)
The pins (wires) on each end of a straight-through cable must be identical.
The most common straight-through standard is wired as follows:
1
2
3
4
5
6
7
8
White Orange
Orange
White Green
Blue
White Blue
Green
White Brown
Brown
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------------------------
------------------------
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White Orange
Orange
White Green
Blue
White Blue
Green
White Brown
Brown
1
2
3
4
5
6
7
8
A cross-over cable is used in the following circumstances:
• From a host to a host
• From a hub to a hub
• From a switch to a switch
• From a hub to a switch
• From a router to a router
To make a crossover cable, we must swap pins 1 and 3, and pins 2 and 6 on
one end of the cable. The most common crossover standard is as follows:
1
2
3
4
5
6
7
8
White Orange
Orange
White Green
Blue
White Blue
Green
White Brown
Brown
------------------------
------------------------
------------------------
------------------------
------------------------
------------------------
------------------------
------------------------
White Green
Green
White Orange
Blue
White Blue
Orange
White Brown
Brown
3
6
1
4
5
2
7
8
Remember, when connecting anything into a hub or switch, except for
another hub or switch, we use a straight-through cable. When connecting
“like” devices, we use a crossover cable.
Ethernet Standards v1.10 – Aaron Balchunas
* * *

Types of Twisted-Pair Cables (continued)
Finally, a roll-over cable is used to connect a PC into a Cisco router’s
console or auxiliary port.
The pins are completely reversed on one end to make a rollover cable:
1
2
3
4
5
6
7
8
White Orange
Orange
White Green
Blue
White Blue
Green
White Brown
Brown
------------------------
------------------------
------------------------
------------------------
------------------------
------------------------
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Brown
White Brown
Green
White Blue
Blue
White Green
Orange
White Orange
8
7
6
5
4
3
2
1