Network Devices

Repeater

Repeater is a device that amplifies the signal it receive.In other words repeater is a device which receive a signal and retransmits it at higher level or high power so that the signal can cover longer distance.
Its used when the distance between sender and receiver is more so that data can be send noiseless(true data) to receiver.

Bridge

Bridge is a device that is used to connect sub network or LAN(Local Area Network). It connect only similar type of LAN or sub network. Means protocol should be same both network. Its possible to connect more than one bridge between two LAN it called redundant bridge.Disadvantage of redundant bridge is data may be in loop.

Router

Router is a network device that is used to connect two sub network or LAN but protocol of network can be different. Its also responsible to provide route to data.It is not a multi port converter.

Hub

Hub is a network device which is used to connect multiple network hosts. A hub is also used to do data transfer.The data is transfer in term of packet on the network.
Its two type
Active Hub has cleaning and boosting capacity and It can use for cable connection.
Passive Hub has no cleaning and boosting capacity and It may or may not use for cable connection.

Switch

Switch is almost similar to Hub but it is more intelligent to hub such that Hub just does the work of data forwarding, a switch does filter and forwarding which is more intelligent way of dealing with the data packet.

Gateway

It is similar to the Router and used to connect different type protocol network but It can connect more than two sub network which can be dissimilar type so it called multi port convertor.