Understanding the network.pdf - Back to Home

In theory, a computer network can operate over any transport medium that can
carry transmission signals, but a desirable level of performance and reliability is
required for data transmission. There are a variety of connected and connectionless
data communication media. Connected media are used for dedicated links between
two or more communication devices. Wireless media use transmitters and receivers
to send modulated electromagnetic waves. Connected media offer reliability and
security, but are dependent on the scope of the infrastructure. Wireless media are
not constrained by physical access or distance, but they are susceptible to
obstruction and noise and offer no media component security.
Connected Media
Coaxial cable, twisted-pair cable, and optical fiber are the most common media used
for connected signal transmission (see Figure 1.1).