Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three.)

The correct answer is B. Switch A - Fa0/1 C. Switch B - Fa0/0 D. Switch B - Fa0/1. In Spanning Tree Protocol (STP), designated ports are selected per segment-the port on the segment with the best (lowest) path cost to the root bridge becomes the designated port. With equal bandwidth on all links, the root bridge is elected by lowest Bridge ID (priority + MAC).

Operate a Medium-Sized Switched Network

Question

Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three.)

Options

ASwitch A - Fa0/0
BSwitch A - Fa0/1
CSwitch B - Fa0/0
DSwitch B - Fa0/1
ESwitch C - Fa0/0
FSwitch C - Fa0/1

How the community answered

(49 responses)

A
12% (6)
B
82% (40)
E
2% (1)
F
4% (2)

Explanation

In Spanning Tree Protocol (STP), designated ports are selected per segment-the port on the segment with the best (lowest) path cost to the root bridge becomes the designated port. With equal bandwidth on all links, the root bridge is elected by lowest Bridge ID (priority + MAC). All ports on the root bridge are designated ports. Based on this topology: Switch B is the root bridge, making both its ports (Fa0/0 and Fa0/1) designated ports-answers C and D. Switch A - Fa0/0 is Switch A's root port (best path to root), while Switch A - Fa0/1 faces a segment where Switch A has the better path to root, making it a designated port-answer B. Switch C's ports are either root ports or blocking ports in this topology.

Topics

#STP designated ports#spanning tree#port roles#switched topology

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