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A network is a system of hardware and software, put together for the purpose of communication and resource sharing. A network includes transmission hardware, devices to interconnect transmission media and to control transmissions, and software to decode and format data, as well as to detect and correct problems.

There are several types of networks in use today.


LANs are basically used to connect a limited geographical area. devices such as; routers, Ethernet switches, hubs, repeaters, and bridges are used for LAN. Full-time connectivity is provided to local service and multi-access is allowed to high-bandwidth media.


WANs are used to connect comparatively large geographical area over a range of 100,000 kilometer radius (between the Earth and artificial satellites). It cannot be handled at individual level. Devices used in WANs are: routers, communication servers, and modems.


A virtual private network (VPN) is a special type of secured network. A VPN is used to provide a secure connection across a public network, such as an internet. They use some form of encryption and have strong user authentication

Network Devices
    • Routers
    • Firewalls
    • Gateways
    • Switches
Network Security
    • Cisco Firewall
    • Dell Sonicwall