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Title: Networking Devices
Description: This note contains the information about all the network devices used and their functions
Description: This note contains the information about all the network devices used and their functions
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NETWORKING AND INTERNETWORKING DEVICES
1
...
i
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A REPEATER WORKS AS A SIGNAL
AMPLIFIER
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REPEATER REGENERATE ANALOG OR DIGITAL SIGNALS DISTORTED BY
TRANSMISSION LOSS
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ANALOG REPEATER ONLY AMPLIFY THE SIGNAL
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2
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HUB IS ALSO KNOWN AS MULTIPORT REPEATER
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TYPES
(I)
ACTIVE HUBS:
A CENTRAL CONNECTING DEVICE IN A NETWORK THAT
REGENERATES SIGNALS ON THE OUTPUT SIDE TO KEEP THE SIGNAL STRONG
...
IT DOES NOT
REGENERATES
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ENABLES AN ADMINISTRATOR TO CONFIGURE EACH PORT IN THE HUB
...
USES
HUBS REPEATES ALL THE INFORMATION IT RECEIVES AND FORWARD IT TO ALL PC
TERMINALS ATTACHED TO IT
...
THE DATA IS SENT IN BULK WITHOUT THE IDENTIFICATION OF ITS DESTINATION
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BRIDGE
BRIDGES ARE USED TO CONNECT MULTIPLE NETWORK SEGMENTS
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IT WORKS AT DATA LINK LAYER OF OSI MODEL
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WORKING
BRIDGE INSPECT INCOMING TRAFFIC AND DECIDE WHETHER TO FORWARD OR
DISCARD IT
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4
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SWITCHES ARE USED AT DATA LINK LAYER OF OSI MODEL
WORKING
RECEIVES A MESSAGE FROM ANY DEVICE CONNECTED TO IT AND THEN TRANSMITS
THE MESSAGE ONLY TO THAT DEVICE FOR WHICH THE MESSAGE WAS MEANT
...
HUB RECEIVES A MESSAGE AND THEN
TRANSMITS IT TO ALL THE OTHER DEVICES ON ITS NETWORK
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TYPES OF SWITCHING
THERE ARE FOUR FORWARDING METHODS A BRIDGE OR SWITCH CAN BE USED
(1) STORE AND FORWARD
THE STORE AND FORWARD SWITCH BUFFERS AND VERIFIES EACH FRAME BEFORE
FORWARDING IT
...
(2) CUT THROUGH
CUT THROUGH SWITCHES READ ONLY UP TO THE FRAME’S HARDWARE ADDRESS
BEFORE STARTING TO FORWARD IT
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IT IS FASTEST THAN OTHERS
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FRAGMENT FREE CHECKS THE FIRST 64 BYTES OF THE FRAME, WHERE ADDRESSING
INFORMATION IS STORED
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NOW A DAYS MOST USING SWITCH IS STORE AND FORWARDING SWITCH
...
ROUTER
ROUTER IS A SPECIALIZED COMPUTER CONNECTED TO MORE THAN ONE
NETWORK
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ROUTER WORKS AT NETWORK LAYER OF OSI MODEL
...
SEVERAL COMPANIES THAT MAKE ROUTERS ARE: CISCO, 3COM, JUNIPER, HP,
NORTEL
EACH INTERFACE OF A ROUTER PROVIDES A SEPERATE BROADCAST DOMAIN
Title: Networking Devices
Description: This note contains the information about all the network devices used and their functions
Description: This note contains the information about all the network devices used and their functions