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Question 107

Refer to the graphic.

The switch is operating using STP. All default parameters have been maintained. Which port will be assigned a designated port role?

    Correct Answer: A

    In a scenario involving a switch and a hub, the switch's ports will compete for the designated port (DP) role. The designated port is the one that has the best path to the root bridge or, if all default parameters are maintained, it is based on the port priority and port numbers. Since the root bridge is not specified, and we're working with defaults, the switch will choose the port with the lowest port number as the designated port. In this case, G0/0/1 on switch A will be assigned the designated port role because it has the lowest port number among the two interfaces (G0/0/1 and G0/0/2) on the switch.

Discussion
jjbt_112Option: A

A. The Tiebreakers for determining DP(Designated Ports), are the same (and same order) with the RP(Root Port) elections, the last two tiebreakers are used when a single switch can connect two o more interface to the same collision domain. For example when using a Hub. Tiebreakers (in Order) 1 .- The switch picks the port connected to the neighbor with the lowes BID 2 .- The switch choose based on the lowest neighbor port priority (Configurable Option) 3 .- The switch choose based on the lowest neighbor internal port number.