CCNA/CCNP preparation notes

by Andreas Ryf

Cables & fibres are the most commonly used medias in LANs (set aside WLANs which are described by IEEE's 802.11 standards).

There are also other medias like free space optics (FSO) that operates with lasers and various Radio transmission based equipment, but they are often using either proprietary formats or using encapsulation.

As cables, nowadays, only twisted pair is relevant. Coaxial cable can be considered as obsolete.

For fibres in LANs mostly Multimode fibres are used. They are cheaper than Singlemode fibres, which have a much better performance on lond distances and are therfore used for WANs (up to global distances).

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Subtopics: optical fibres Twisted pairs Coax