Which of the following statements are true about STP BPDUs?
Which of the following statements are true about STP BPDUs?
STP (Spanning Tree Protocol) uses two types of BPDUs (Bridge Protocol Data Units): configuration BPDUs and Topology Change Notification (TCN) BPDUs. Configuration BPDUs are used to maintain the spanning tree structure, while TCN BPDUs are used to inform changes in the network topology. Therefore, the statement that STP has two types of packets: configuration BPDU and TCN BPDU is correct.
Isnt A and B also correct?
correct answer: A, B and D
ABD true, C false: There are two types of STP BPDUs: Configuration BPDUs (heartbeat):STP-enabled designated ports send configuration BPDUs at Hello timer intervals. Topology Change Notification (TCN) BPDUs are sent only after a device detects a network topology change. A BPDU is encapsulated in an Ethernet frame. Its destination MAC address is a multicast MAC address, 01-80-C2-00-00-00 Each bridge actively sends configuration BPDUs during initialization. After the network topology becomes stable, the designated port of each device periodically sends configuration BPDUs https://support.huawei.com/enterprise/en/doc/EDOC1000142081/e99e1364/bpdu-format
A and D seems the right.