Media
Modern networks can utilize several types of network media.
Most networks use some type of cable for the connection media however, air is sometimes used.
Wireless technologies, such as infra-red and satellite communications, will become increasingly important in the future.
This section covers twisted-pair, coaxial, and fiber optic cabling.
Most building codes require that plenum grade cable be used when installing networking cable in ceilings or walls. The jackets of certain types of network cable give off a toxic gas when burned, which is unacceptable for most fire codes. Plenum grade cable does not give off a toxic gas when burned.