MAC continued. Ethernet (802.3). 1-persistent CSMA/CD + binary exponential backoff Carrier sense: station listens to channel first 1-persistent: If idle, station may initiate transmission
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(a) DIX Ethernet, (b) IEEE 802.3
Find the average number of collisions before a frame is sent.
10Base5 500 meters thick (cable) Ethernet 100 nodes/seg
10Base2 200 meters thin (cable) Ethernet 30 nodes/seg
10BaseT 100 meters twist pair 1024 nodes/seg
10BaseF 2000 meters fiber optics 1024 nodes/seg
10Base5/10Base2, cable connected to each machine
10BaseT -- connecting to a hub
10BaseF -- between building Connecting