CSE 123 Lecture Notes - Lecture 7: Local Area Network, Collision Domain, Collision Detection
13 Oct 2018
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One shared link (bus) limits scale in terms of. We don"t have to share air spaces in time. Better alternative is to have multiple busses. Need ability to connect multiple busses together! Hub: when it hears a bit come in on one wire, it copies that bit to all the other wires. Repeat received bits on one port out all other ports. We may have to amplify the signal (repeat it) Can"t share this link at the same time (frames will hit!) Average throughput < as # nodes increases. Still limited in distance and # of hosts. Collision detection requirements (gets harder as the medium gets larger) Bridges - receives stuff and copies it over, frame-by-frame. Can read the entire frame and hold it (to prevent collisions) Buffers entire packet and then rebroadcasts it on other ports. All have to speak the same ethernet! Can"t connect 10 mbps and 100 mbps networks.
