Refer to the exhibit. Spanning-tree port priorities are listed beneath each interface. The network administrator enters the spanning-tree vlan 1 root primary command on S4. What is the effect of the command?

Question:
Refer to the exhibit. Spanning-tree port priorities are listed beneath each interface. The network administrator enters the spanning-tree vlan 1 root primary command on S4. What is the effect of the command?

• S3 Gi0/2 transitions from designated port to root port because of path cost changes caused by the root change.
• Spanning tree blocks Gi0/1 on S3 to prevent a redundant path from S1.
• S2 Gi0/1 becomes a nondesignated port because Gi0/2 has a lower path cost to S4.
• Port priority makes Gi0/2 on S1 a root port.
• S4 is already the root bridge, so there are no port changes.

Explanation: According to the exhibit, S1 is the root bridge. After the spanning-tree vlan 1 root primary command on S4 is issued, S4 becomes the root bridge, because S4 priority is modified to 24576 and the MAC address is lower than the MAC address of S1. This causes S3 Gi0/2 port to transition from designated port to root port because of path cost changes caused by this root change.

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