*****NO EXHIBIT***** - Select Switch SW4 F1/2, Blocking., Switch SW1 G1/0, Designated., Switch SW2 G1/0, Root Port. Refer to the exhibit. The switches have been configured to run Rapid Spanning Tree Protocol (802.1w) and no default configuration has been changed. Which of the following statements are true about the interface and its port role for each switch? (Choose three)

Switch SW3 G1/1, Root Port.

Switch SW2 G1/0, Root Port.

Switch SW2 F1/1, Blocking.

Switch SW1 G1/0, Designated.

Switch SW4 F1/2, Blocking.

Switch SW1 G1/1, Root Port.

Explanation

The Switches exchange BPDUs to elect the Root Bridge. If default values remain the same, the priority has not been modified; the Switch with the lowest Bridge ID is Switch SW1, which has the lowest numerical MAC address. Automatically the two downlink ports of the Root Bridge become designated ports. The non-root bridges elect their root port based on the sum of the costs of all the switch ports that the frame exists if it follows a determined path. The best cost (lowest cost) to the root bridge would be elected the root port, which is usually an uplink closest to the root bridge. Switch SW2 port g1/0, SW3 port g1/0 are root ports, while the downlink ports are designated ports in both switches. Switch SW4 has on blocked port and one root port. If the cost is the same to reach the root bridge, then the lowest sender Bridge ID is used as a tie breaker. In this case the path to reach the root bridge from switch SW4 is from switch SW3, because there are two Gigabit Ethernet interfaces. Then f1/1 in SW4 will become the root port and f1/2 will be blocked. For more information refer to: [http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html]