Basic hardware components(Computer Network)
All networks are built from basic building blocks of the network nodes to connect, such as network interface cards (NICs), bridges, hubs, switches and routers. In addition, a method of connecting these building blocks, usually in the form of galvanic cable (usually Category 5 cable). Less common are microwave links (as in IEEE 802.12) or optical cables (optical fiber). Ethernet card may be required.
Network interface cards
A network card, network adapter or NIC (network interface) is part of computer hardware designed for computers to communicate through a computer network. It provides physical access to the network environment and often provides low-level addressing system through the use of MAC addresses.
Repeaters
Repeater receives a signal and a higher power as an obstacle to the other side it retransmits or degradation over long distances without the cover an electronic device, so that signal. In most twisted pair ethernet configurations, repeaters for long cable runs 100 meters is required.
Computer-network 