200-301: Cisco Certified Network AssociateDemo

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QuestionQ1026

Security Fundamentals

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Refer to the exhibit. Which switch in this topology is elected as the root bridge?

SW1 0С:B4:86:22:42:37 -

SW2 0С:0B:15:22:05:97 -

SW3 0C:0B:15:1A:3C:9D -

SW4 0С:B0:18:A1:B3:19

  • A SW1
  • B SW2
  • C SW3
  • D SW4
Explanation

STP elects the switch with the lowest Bridge ID. SW3 and SW4 share the lowest STP priority, 4096; therefore, their MAC addresses break the tie. SW3’s MAC address, 0C:0B:15:1A:3C:9D, is numerically lower than SW4’s 0C:B0:18:A1:B3:19, making SW3 the root bridge.

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