network cisco ccna gns3 certification arteq

network cisco ccna gns3 certification arteq
a network runs through it

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Sunday, November 27, 2011

please stop teaching and using csma/cd now...


on a csma/cd Ethernet
a device with a frame to send listens for the Ethernet to be not busy
the device sends the frame after not busy detected
the sender listens to ensure no collision has been detected
after a collision is detected, they each send a jamming signal to ensure all stations 
     recognize the collision
after jamming is complete each sender randomizes a timer and waits
after timer expiration start step 1

  half-duplex Ethernet uses a loopback circuit to detect collisions. Full duplex uses two wire pairs to avoid collisions altogether. Full duplex is good because it is collision free with increased throughput

this is very exciting to my baby ears...

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