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Refer to the exhibit. Three switches have been configured with basic parameters. The loop prevention mechanism being used is RSTP with its parameters left by default. Which switch and its interfaces shows the correct RSTP port roles?
SW3 (Fa1/1 _ Root, Fa0/1 - Desg)
SW3 (Fa1/1 _ Root, Fa0/1 _ Root)
SW2 (Fa1/1 _ Root, Gi0/1 - Desg)
SW1 (Fa1/1 _ Altn, Fa0/1 _ Root)
SW2 (Fa1/1 _ Root, Gi0/1 _ Altn)
In this scenario, only the basic and default RSTP configuration is enabled on the switches, meaning all three switches have the same Bridge Priority. Remember that the criteria for selecting the root bridge is the Bridge ID (Bridge Priority and MAC address). The default priority is 32768. Since they all have the same priority, the tie breaker would be the MAC address, the switch with the lowest MAC address will be selected as the Root Bridge (SW3). All ports on the root bridge (SW3) will be Designated Ports (forwarding). Since interfaces Fa1/1 (SW2) and Fa0/1 (SW1) are the closest to the root bridge (SW3), they will become the Root Ports. Now, the remaining ports needs to be identified (link between SW1 and SW2). Because SW1s MAC address is lower than SW2s, the interface Fa1/1 (SW1) will be the Designated Port (forwarding) and the interface Gi0/1 (SW2) will be the Alternate Port (Discarding). (http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#roles)
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