200-301: Cisco Certified Network AssociateDemo

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QuestionQ1013

Network Fundamentals

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Refer to the exhibit. Which switch will become the root bridge?

  • A SW 4 -Bridge Priority - 49152 -mac-address 06:8e:bc:7e:5b:85
  • B SW 3 -Bridge Priority - 49152 -mac-address 0d:e4:96:da:ee:95
  • C SW 1 -Bridge Priority - 36864 -mac-address 05:a7:23:5b:52:25
  • D SW 2 -Bridge Priority - 36864 -mac-address 04:1e:c4:bf:02:55
Explanation

A spanning-tree root bridge is elected by the lowest Bridge ID, which is determined first by bridge priority and then, when priorities are equal, by the lowest MAC address. The lowest priority shown is 36864, shared by SW1 and SW2. Between those two, SW2 has the lower MAC address, so SW2 is elected the root bridge.

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