HUB :- Short name of Hirarical Universal Bus, it works on Physical layer of the OSI model. Basically it is a half duplex device, also some time this device is called duffer device because it doesn't have any memory for storage. It also works like repeater. Hub always does broadcasting only, This is the reason, why it has been stoped using now a days.
There is one collision domain in Hubs.
Hubs are replaced by switches.
Hub have three major types
1) Active Hub :- having power supply
2) Passive Hub :- No power supply
3) Intelligent Hub :- Bother the hubs used in this type.
(Collision Domain:- Maximum numbers of devices which can send data without collision simultaneously.
Amplifier:- It increase the strength of any network. But it doesn't remove the noise that's why it has been stop using.
Repeater :- This device is used to regenerate the weak and end aged signals, nor it make any noise neither remove the existed noise from the actual signal.
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