- A network is, fundamentally, a system of senders and receivers – a common feature of any communication system.
- The sender, or source, is a computer which sends information to another.
- The receiver, or destination computer, is the computer to which the information is sent.
- Any machine capable of communicating on the network is a device or node.In order to communicate the devices must be connected to each other.
- Most networks are connected by cable.
- Cables can use either copper or optical fibre to carry the signals
- Radio and microwave transmission are becoming increasingly common.
- If two or more networks are connected to each other this is known as an internetwork
Communications Data Model
Categories of Networks (1)
- A network which covers a single floor, or perhaps an entire building, is known as a Local Area Network (LAN).
- LANs connected using high speed links across a metropolitan area is known as a MAN.
- If the public switched telephone network is used to connect the networks this is known as a Wide Area Network, or WAN.
- If a number of LANs are connected to a larger central network this is known as a Backbone Network, or BN (eg University of Wolverhampton).
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