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To determine which switch becomes the root bridge, we need to analyze the Bridge ID (BID) of each switch in the exhibit. The BID consists of two components:
Bridge Priority: Default value is typically 32,768 unless configured otherwise.
MAC Address: This is used as a tiebreaker if the priority values are the same.
Steps to Determine the Root Bridge:
The lowest BID (priority + MAC address) determines the root bridge.
If two switches have the same priority, the switch with the lowest MAC address becomes the root bridge.
Analysis of Each Switch:
SW2:
Bridge Priority: 53,248
MAC Address: 02:3e:ee:61:5b:21
SW3:
Bridge Priority: 53,248
MAC Address: 02:aa:03:d3:05:87
SW4:
Bridge Priority: 32,768
MAC Address: 07:c1:b7:27:dd:73
SW1:
Bridge Priority: 32,768
MAC Address: 0d:ca:8e:7f:a0:24
Determination:
SW2 and SW3 have higher priorities (53,248), so they are eliminated as root bridge candidates.
SW4 and SW1 have the same priority (32,768). To break the tie, compare the MAC addresses:
SW4: 07:c1:b7:27:dd:73
SW1: 0d:ca:8e:7f:a0:24
SW4 has the lower MAC address, making it the root bridge.
Final Answer:
C. SW4 (Bridge Priority: 32,768, MAC Address: 07:c1:b7:27:dd:73)...