1. HUB – AMPLIFIER - REPEATER
Computer Networks
HUB – AMPLIFIER - REPEATER By
Harsh Seksaria( )
Mohnish Vedi( )
Rajesh Patel( )

2. HUB Ethernet was invented in 1973 by Bob Metcalfe
Connect multiple ethernet devices together
Multiple input-output ports
Broadcasting by nature
Signal introduced at input of any port appears at output of every port except the original incoming port
Sends frames to all devices on a network

3. HUB Advantages Disadvantages
Historically, main reason for purchasing hubs was their price
Hubs are generally easy to install and maintain
A good option for home networking
Disadvantages
A frame is passed along or "broadcast" to every one of its ports which results in unnecessary traffic
This places a lot of traffic on the network and can lead to poor network response times

5. Uses of Hub Hubs are used to create small Home Networks
Hubs are used in Organizations and Computer Labs for connectivity
It Makes one device or peripheral available throughout the whole network

6. AMPLIFIER
An amplifier is an electronic device that can increase the power of a signal

8. Input Signal
Output Signal
Working of Amplifier

9. REPEATER
Repeater is a device that receives a signal and retransmits it.
Repeaters work at the physical layer of OSI model. 
Used to extend transmissions so that signal can cover long distances
Some types of repeaters broadcast an identical signal, but alter its method of transmission
It consists of three components – receiver, frequency converter
and transmitter.

10. LAN

12. REPEATER Advantages Disadvantages
Easily extend the length of the network
No overhead processing, so very little performance degradation(if any)
It can connect signals from same network type that uses different types of cables
Disadvantages
Does not support connection of different network architecture.
Number of repeaters between two ends should be limited.

13. How is Hub and Repeater related?
A repeater and a hub both work on the Physical Layer of the OSI Model.
A Hub is essentially a multiport repeater.
Both are very “dumb” devices (no offense to any of you repeaters out there).

14. How is Repeater different from Amplifier?

15. Amplifier is used to magnify a signal, whereas repeater is used to receive and retransmit a signal with a power gain.
Repeater has an amplifier as a part of it.
Sometimes, amplifiers introduce some noise to the signal, whereas repeaters contain noise eliminating parts.

16. Thank You