CCNA (fourth lecture)

Fourth Lecture

Most important protocols:

And here are the ports number of each protocol, which means the port which packets go from:

Ethernet Cabling 

There are three ways to make your ethernet cable:

•Straight-through cable

• Crossover cable

• Rolled cable

Later I will tell you when we use each of them

Here is the draw of the first way (Straight-through cable)

It's called straight-through because you connect both sides the same way , and the draw above shows the colors and how to connect them correctly.

second way (Cross-over)

Here we connect them in a different way and the colors above show how to.

Third way(Rolled-over)

Here we connect the first one , then the second one is connected in the opposite way .

Now, the question is: when we use the first, second, and the third way ?

Simply, here is the answer:

between these devices we use the cables as the following:

Straight-Through Cable : •Host to switch or hub

                                    • Router to switch or hub

Crossover Cable: •Switch to switch

                           • Hub to hub

                           • Host to host

                           • Hub to switch

                            • Router direct to host

Rolled Cable: It is typically used to connect a computer terminal to the console port of a router
(I will show you later when we use it and how)

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