- Finish CSMA/CD. - Spanning Tree Protocol. - CSMA/CD. - CSMA/CD (Collision Detection). - Limits on CSMA/CD Network Length. - Limits on CSMA/CD Network Length and Frame Size. - CSMA/CD in one slide!. - CSMA/CD (Collision Detection): An example. - Performance of CSMA/CD: Why frames?. - Link Layer on top of Physical Layer. - If following bit is 0, this is the start of the frame. - If following bit is 1, this is the end of the frame. - CSMA/CD for media access control. - Build spanning tree. - Links not in the spanning tree are not used in forwarding frames. - A Spanning Tree. - Another Spanning Tree. - Yet Another Spanning Tree. - Protocol by which bridges construct a spanning tree. - Spanning Tree Approach. - Pick subset of links that form a spanning tree. - Design a Spanning Tree Protocol. - Compute the shortest paths to the root. - Ethernet’s spanning tree construction does both with a single algorithm. - Constructing a Spanning Tree. - Proposing Y as the root. - Steps in Spanning Tree Protocol. - Initially each switch proposes itself as the root. - Switches compute their distance from the root. - Links on Spanning Tree. - Now which ones are on the Spanning Tree?. - Robust Spanning Tree Algorithm. - Failure of the root node. - Switch #4 thinks it is the root. - Then switch #4 hears from #2. - and thinks that #2 is the root. - Then switch #4 hears from #7. - Switch 2 hears (1,1,3) from 3. - Switch #4 hears from switch #2. - Switch #4 hears from switch #7
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