Wired and wireless networks

Wired and wireless networks

1. WPA Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access II (WPA2) are two security protocols and security certification programs developed by the Wi-Fi Alliance to secure wireless computer networks.

   • Coaxial Cable A transmission media that consist of a central wire,surrounded by insulation and a shield of braided wire to minimise interference
     • Hub A connection point for devices in a network unintelligent packets are broadcast to every device
       • VPN- Virtual Private Network

2. A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. A data packet is typically forwarded from one router to another router through the networks that constitute an internetwork until it reaches its destination node.

3. A network switch (also called switching hub, bridging hub, officially MAC bridge) is a computer networking device that connects devices together on a computer network by using packet switching to receive, process, and forward data to the destination device.

   • Wired home networks are less expensive, faster, and more secure than wireless networks. However, the same Ethernet cable that provides these advantages, is also its biggest disadvantage. All computers on a wired network must be connected by Ethernet cable.

4. Many coaxial cables also have an insulating outer sheath or jacket. The term coaxial comes from the inner conductor and the outer shield sharing a geometric axis. Coaxial cable was invented by English engineer and mathematician Oliver Heaviside, who patented the design in 1880.

5. Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from unshielded twisted pair (UTP) cables, and crosstalk between neighboring pairs

6. Fibre Optic Cable a transmission media that consists of a bunch of glass or plastic threads

   • Network interface Card a hardware device internal to a computer that allows a computer to connect to a network.