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Cisco Certified Network Associate (CCNA) · Cisco
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because the priority of S1 high and even the AA:AA as example of mac address the A first letter so higher than others the first root bridge closer to it is the S2 with lower priority and mac add as letters it's tricky as the other guy said they want us to know resolve the STP rules puzzle
A is right. Switch 2 and 3 has invalid priority. Priority should be in multiplication of 4096.. like 32768, 28672
The 30000 bridge priority is invalid so it will be rounded to the closest multiple of 4096 which is 28672.