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.

Hub contains multiple ports. When the package arrives at a port, it is copied unchanged to all ports hub for the transfer. Destination address in the box does not change the broadcast address.

A network bridge connects multiple network segments in the layer data link (layer 2) of the OSI model. Bridges not promiscuous copy traffic to all ports, as hubs, but to know the MAC addresses are reachable through specific ports. Since the members of a bridge of a port and an address, it will send traffic to this address only to that port. Bridges send broadcasts to all ports, except that where the transmission was received.

Bridges learn the association of ports and addresses by examining the source address of frames that can be seen in various ports. Once a picture is through a gate, the source address is stored and the bridge assumes that MAC address is connected to that port. The first time that an unknown destination address is seen above, the bridge of the frame to all ports other than the frame arrived.

Bridges come in three basic types:

1. Local bridges: Directly connect local area networks (LANs)
2. Remote bridges: Can be used in a Wide Area Network (WAN) to create connections between local networks. Remote bridges, where the connection is slower than the networks finals, largely been replaced by routers.
3. Wireless bridges: Can be used to enter or LAN to LAN connect external drives