Friday, October 11, 2019

A host "sensing the wire to see if it is free of traffic / Internet and Networking

A host "sensing the wire to see if it is free of traffic 
            The problem with the process just described is that,  if there are two systems on the workstations "sense" the queens the same time to see if the wire is free,  they will both send data out at the same time if the wire is free.  When the two places of data are send out on the wire at the same time,  they will collide with one another,  and the data will be destroyed,  of the data is destroyed in transit,  the data will need to be transmitted.  Consequently,  after a collision,  each host will wait a variable length of time before retransmitting the data (they don't want the want the data to collide again),  thereby preventing a collision the second time.  When a system determines that the data has collided and then retransmitting the data,  that is known as collision detection.
To summarize,  CSMA/CD provides that before a host sends data on the network,  it will "sense" (CS)  the wireless to ensure that th3 wire is free of traffic.  Multiple systems have equal access to the wire (MA),  and if there is a collision,  a host will detect that collision (CD)  and retransmitting the data.
CsMa/CD:- Carrier sense multiple access with collision avoidance (CSMA/CD) is not as popular as CSMA/CD and for good reason.  With CSMA/CD , before a host sends data on the wire, it will "sense" th3 wire as well to see if the wire is free of signals.  If the wire is free,  it will try to "avoid" a collision by sending a piece of "dummy" data on the wire first to see whether it collides with any other data.  If it does not collid3,  the host in effect assumes "if my dummy data did not collide,  then the real data will not collide, "and submits the real data on the wire. 

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