Network and Digital Communication:
Clarke's Law: If an elderly but distinguished scientist says that something is possible he is almost certainly right
A computer network is a system of two or more computers linked together.
Local Area Network: Physically close together ususally in the same building.
Node are connected by cables which may be either twisted pair or coaxial cable.
A metropolitan area network (MAN) links two or more LANs with a city'Wide Area Network (WAN) extends over a long distance
Routers: hardware devices or software programs that route messages as they travel between networks
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