A telecommunications network is a collection of terminal nodes, links and any intermediate nodes which are connected so as to enable telecommunication between the terminals.
The transmission links connect the nodes together. The nodes use circuit switching, message switching or packet switching to pass the signal through the correct links and nodes to reach the correct destination terminal.
Each terminal in the network usually has a unique address so messages or connections can be routed to the correct recipients. The collection of addresses in the network is called the address space.


• Wide area networks (WAN)
• Metropolitan area networks (MAN)
• Local area networks (LAN)
• Internet area networks (IAN)
• Campus area networks (CAN)
• Virtual private networks (VPN)