200-301: Cisco Certified Network AssociateDemo

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QuestionQ336

Network Fundamentals

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Refer to the exhibit. All interfaces are in the same VLAN. All switches are using the default STP priorities. During the STP election process, which switch becomes the root bridge?

  • A MDF-DC-1: 08:E0:43:42:70:13
  • B MDF-DC-2: 08:0E:18:22:05:97
  • C MDF-DC-4: 08:E0:19:A1:B3:19
  • D MDF-DC-3: 08:0E:18:1A:3C:9D
Explanation

In STP, the root bridge is the switch with the lowest Bridge ID. When all switches have the default STP priority in the same VLAN, the tie is broken by the lowest MAC address. Among the listed switches, 08:0E:18:1A:3C:9D is the lowest MAC address, so MDF-DC-3 is elected the root bridge.

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