As shown in the figure, all three switches run RSTP, and the STP priority of ST2 can be configured as 2000 to make it a root bridge. BID: 32768.0c-00-0d-0a-00-01 BID: 32768.0c-00-0d-0a-00-02 BID…

Question

Options

• ATRUE
• BFALSE

• A
  30% (16)
• B
  70% (37)

Explanation

Option B is correct because STP/RSTP bridge priority values must be multiples of 4096 (valid values: 0, 4096, 8192, 12288 ... up to 61440). The value 2000 is not a multiple of 4096, making it an invalid priority that cannot be configured on any switch - the command would simply be rejected by the device.

Option A is wrong because it assumes 2000 is a configurable priority. While ST2 (MAC ending in 00-02) does need a lower priority than ST1 (00-01) to become root bridge, the configured value must still be a valid multiple of 4096 - for example, 4096 would work, but 2000 would not.

The root bridge election in this topology would currently go to ST1 (lowest MAC address, with all switches tied at priority 32768), so ST2 would need a legitimately lower valid priority to win.

Memory tip: Remember "4096 steps only" - STP priority is like a staircase where each step is exactly 4096 wide. If a number doesn't land on a step (like 2000), you can't stand on it.

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