In the context of Spanning Tree Protocol (STP), the Bridge ID is composed of two parts: the Bridge Priority and the MAC address of the bridge. The Bridge Priority can range from 0 to 61440 in increments of 4096, which means valid Bridge Priority values are: 0, 4096, 8192, 12288, etc.
Evaluating the Options
4096 00-01-02-03-04-CC
Valid: 4096 is a valid Bridge Priority.
0 00-01-02-03-04-CC
Valid: 0 is a valid Bridge Priority.
2048 00-01-02-03-04-CC
Invalid: 2048 is not a valid Bridge Priority because it is not a multiple of 4096.
8192 00-01-02-03-04-CC
Valid: 8192 is a valid Bridge Priority.
Conclusion
The Bridge ID that cannot exist in configuration BPDUs sent by a switch is 2048 00-01-02-03-04-CC.
Correct Answer is C:
Using bridge priority increments of 0, 4,096 , 8192 and so on.
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