Which three fields are part of a TCN BPDU? (Choose three.)
A. protocol ID
B. version
C. type
D. max-age
E. flags
F. message age
Which three fields are part of a TCN BPDU?
Which three fields are part of a TCN BPDU? (Choose three.)
A. protocol ID
B. version
C. type
D. max-age
E. flags
F. message age
Check the official guide v1 page 108.
A,B,C.
The flag is for TC”A”.
All of these fields are present in ALL BPDUs, including TCNs (Topology Change Notifications). However, setting the BPDU type byte to 0x80, indicates a TCP, and setting bit 1 in the Flags field are the ways you indicated the BPDU is a TCN, the correct answer must include C and E. The only other field that has any specific value for a TCN is the Version ID field, which must be set to 0x00 for TCNs and Config BPDUs.
Correct answer is B, C & E