Switching in computer networks2019

   SWITCHING TECHNOLOGY:-

·         SWITCHING TECHNOLOGY ALLOW HOW THE NETWORK DEVICES CONNECTED IN NETWORKING AND HOW DATA PACKETS FORWORDS FROM ONE PLACE TO OTHER.
·         IN NETWORK SWITCHING WE USE DIFFERENT NETWORK LIKE SWITCH, HUB, ROUTER, BRIDGE AND GATEWAY WHICH USED TO ESTABLISH CONNECTION NETWORKS.
·         NETWORK DEVICE MOSTLY USED AT NETWORK LAYER AND DATALINK LAYER AT OSI MODEL.
 
THER ARE TWO TYPE OF SWITCHINGà
 
PACKET SWITCHING
CIRCUIT SWITCHING
 
PACKET SWITCHING:- PACKET SWITCHING IS NOT REQUIRED TO ESTABLISH THE CONNECTION INITIALY.
·         IN PACKET SWITCHING THE CONNECTION/CHANEL IS AVAILABLE TO USE BY MANY USER. BUT WHEN CAPACITY OR NUMBER OF USERS INCREASES THEN IT WILL LEAD TO CONGESTION IN NETWORK
·         PACKET SWITCHED NETWORKS ARE MAINLY USED FOR DATA AND VOICE APPLICATION REQUIRING NON-REAL TIME SCENARIES.
·         IN PACKET SWITCHING, STATION BREAK LONG MESSAGE INTO PACKETS. PACKETS ARE SENT ONE AT A TIME TO THE NETWORK.
·         IN PACKET SWITCHING PACKET ARE RE-ARRANGED AT THE END OF RECEIVING END.
CIRCUIT SWITCHING:-  IN CIRCUIT SWITCHING NETWORK DEDICATED CHANNEL HAS TO BE ESTABLISHED BEFORE THE CALL IS MADE BETWEEN USERS.
·         THE CHANNEL IS RESERVED BETWEEN THE USER TILL THE CONNECTION IS ACTIVE.
·         CIRCUIT SWITCHING USE HALF DUPLEX DATA TRANSMISSION.
·         FOR HALF DUPLEX COMMUNICATION, ONE CHANNEL IS ALLOCATED TO THE TWO USER.
·         CIRCUIT SWITCHING IS MAINLY USE FOR VOICE COMMUNICATION REQUIRING REAL TIME SERVICES WITHOUT ANY MUCH DELAY.

DIFFERENCE BETWEEN CIRCUIT SWITCHING AND PACKET SWITCHING

      CIRCUIT SWITCHING
        PACKET SWITCHING
DEDICATED PATH
NO DEDICATED PATH
PATH IS ESTABLISHED FOR ENTIRE CONVERSATION
ROUTE IS ESTABLISHED FOR EACH PACKET
CALL SETUP DELAY
PACKET TRANSMISSION DELAY
OVER LOAD MAY BLOCK CALL SETUP
OVERLOAD INCREASE PACKET DELAY
FIXED BAND WIDTH
DYNAMIC BANDWIDTH
NO OVERLOAD BITS AFTER CALL SWTUP
OVERHEAD BITS IN EACH PACKET
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