Different Interconnecting Devices Repeaters, Hubs, Switches

8/6/2019 Different Interconnecting Devices Repeaters, Hubs, Switches

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Introduction to Different Interconnecting

Devices Repeaters, Hubs, Switches &

Bridges

Presented ByK.Aravind(10mx03)M.Boobalan(10mx05)

V.Boobathiraj(10mx06)K.Saranraj(10mx43)

A.Selvaraj(10mx46)


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Interconnecting Devices

Many interconnection device are required in a modern

network, from the interface that allows a single computer to

communicate with other computers via a LAN cable or atelephone line, to the large and complex switching devices

that interconnect two or more entire networks.


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Some Connecting devices

Repeater

Hub

BridgeSwitches


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Repeater

A repeater is a network interconnection device that

regenerates signals coming in one link onto another.


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Issues

y Repeaters use no logic in regenerating signals, so data and

noise are both sent through the repeater.

yRepeaters can be used to extend the range of a single LAN.


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HUB

A hub is a network interconnection device that accepts an

input signal from an incoming port and copies it onto all of its

output ports.


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Types of Hub

y Passive Hub - Doesnt perform any particular function ,

behaves like a bridge between the cables of connection.

y Active Hub - Ability to regenerate the information with

the help of strong electrical signals. upgrade theproperties of the signals before delivery.

y Intelligent Hub both functions of active and passive

hub provides the opportunity to increase the speed of

networking and also make the performance of thenetwork efficient as compared to other devices.


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Issues

yWith the help of hubs we can create a home

network easily.

yHubs can also monitor the whole networkin a real inexpensive way

y It also provide the opportunity to the users

to connect their old devices with their hubdrives


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Bridge

A bridge is a network interconnection device that

forwards data frames coming in from one connection to theoutgoing link that corresponds to the MAC destination

address in the frame.


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Issues

y Connects two same type of LAN segments

y Learns addresses and filters frames based on those addresses

y Does not forward noise or collisions from the incomingconnection


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SWITCH

A switch is a network interconnection device that accepts a

frame from an incoming port and forwards the frames to the outgoing

link that corresponds to the MAC destination address in the frame.


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Issues

y Permits separate pairs of computers to communicate at the

same time

y Has higher cost than a hub

ySwitches can be used in heavily loaded networks to isolatedata flow and improve performance.


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In the View of OSI Model

y Physical Layer Devices

Repeater

H

uby Data Link Layer Devices

Bridge

Switch


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Repeater

y Signals that carry information within a network can travel a

fixed distance before attenuation endangers the integrity of

data.

y

A repeater receives a signal and, before it becomes too weakor corrupted, regenerates the original bit pattern.

y A repeater connects segments of a LAN

y A repeater forwards every frame, has no filtering capability

y A repeater is a generator, not an amplifier.


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A Repeater in the OSI Model


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A Repeater


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Function of a Repeater


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Hub

y A Hub is a multiport repeater

y Used to create connections in a physical STAR topology

y It broadcast the data to the multiple ports whatever it

receives in input port


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Function of a Hub


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Bridge

y As a physical layer device, it regenerates the signal it receives

y As a data link layer, the bridge can check the physical (MAC)

addresses (source and destination) contained in the frame

HOW

IT

D

IFFERS

FR

OMREPE

ATER

y A bridge has filtering capability

y Check the destination address of a frame and decide if the

frame should be forwarded or dropped. If the frame is to be

forwarded, the decision must specify the porty A bridge has a table that maps addresses to ports


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Transparent Bridges

y It is a bridge in which the stations are completely unaware of

the bridges existence

CRITERIA

y Frame must be forwarded from one stations to another

y The forwarding table is automatically made by learning frame

movements in the network

y Loops in the system must be prevented


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Bridges connecting different LANs

Bridges connect different protocols at the data link layer,

such as Ethernet LAN to a wireless LAN.

y Frame Format

y Maximum Data Sizey Data Rate

y Bit Order

y Security

y Multimedia Support


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A Bridge in the OSI Model


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A Bridge


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Function of a Bridge


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Switch

y Switch classified into two types

Two- layer switch

Three layer switch

y

A two layer switch is a bridge Had many ports and better performance

Can connect few LANs together

Allocate unique port to each station- no competing

trafficy A three layer switch is a kind of router


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Functions ofSwitch


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THANK-U

Reference

*Data Communication and Networkingby Behrouz A Forouzan

*Data Communication and Networks by

James Irvine & David Harle

Documents

Different Interconnecting Devices Repeaters, Hubs, Switches