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Exercises

19 January, 2016 - 11:23
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  1. Consider the switched network shown in the figure below. What is the spanning tree that will be computed by 802.1d in this network assuming that all links have a unit cost ? Indicate the state of each port.
  2. Consider the switched network shown in the figure above. In this network, assume that the LAN between switches 3 and 12 fails. How should the switches update their port/address tables after the link failure ?
  3. Many enterprise networks are organized with a set of backbone devices interconnected by using a full mesh of links as shown in the figure below. In this network, what are the benefits and drawbacks of using Ethernet switches and IP routers running OSPF ?
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Figure 6.39 A small network composed of Ethernet switches 
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Figure 6.40 A typical enterprise backbone network  
  1. Most commercial Ethernet switches are able to run the Spanning tree protocol independently on each VLAN. What are the benefits of using per-VLAN spanning trees ?
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