For a more challenging set of practice questions, sing up at: [ Ссылка ] $14.99 for six months. This lesson covers Domain 4 (Communications and Network Security), Layer 1 (physical) of the Open Systems Interconnect (OSI) model and the various terms you'll need to be familiar with.

It covers the various cabling types such as shielded twisted pair, unshielded twisted pair, coaxial (coax), and fiber optics (single mode, multimode, and plastic optical fiber core). It also discusses layer 1 implementations in the context of the internet and some exam pointers.

It also covers a little bit of Layer 1 implementations for mobile (cell), but does not dive deep into the material.

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