CSMA/CD
Carrier Sense MultiAccess/Collision Detect

1. Listen before talk
2. Listen while talking
3. Wait before talk again

64B * 8 = 512b
512b/10*10^6 b/s = 51.2 us == slot time

Switch/Bridge functions
1. Learning
2. Forwarding
3. Filtering
4. Buffering

cut-through  store-and-forward
check to	check through 
the end of	the end of the
DA		frame