What is the purpose of spanning-tree BPDU guard?

What is the purpose of spanning-tree BPDU guard?

• A. To block specific port traffic
• B. To protect against loops by disabling ports that receive BPDUs
• C. To increase the speed of packet forwarding
• D. To control VLANs on a switch

Answer: (B)

The purpose of spanning-tree BPDU guard is to protect against loops by disabling ports that receive Bridge Protocol Data Units (BPDUs). In a typical network environment that uses the Spanning Tree Protocol (STP) to prevent loops, end-host ports (such as those connected to PCs and printers) do not participate in the generation or forwarding of BPDUs. If a BPDU is received on one of these ports, it indicates a misconfiguration or a loop potential that could disrupt the network topology. When BPDU guard is enabled on a port, it helps maintain the integrity of the network by shutting down that port if a BPDU is detected, thus preventing potential network loops. This feature is particularly useful in preventing issues that may arise from unauthorized switches being connected to the network or from misconfigured devices that could introduce loops. Overall, BPDU guard enhances network stability and performance by proactively managing the potential for loops that can occur when untrusted devices mistakenly participate in the STP mechanism.

The purpose of spanning-tree BPDU guard is to protect against loops by disabling ports that receive Bridge Protocol Data Units (BPDUs). In a typical network environment that uses the Spanning Tree Protocol (STP) to prevent loops, end-host ports (such as those connected to PCs and printers) do not participate in the generation or forwarding of BPDUs. If a BPDU is received on one of these ports, it indicates a misconfiguration or a loop potential that could disrupt the network topology.

When BPDU guard is enabled on a port, it helps maintain the integrity of the network by shutting down that port if a BPDU is detected, thus preventing potential network loops. This feature is particularly useful in preventing issues that may arise from unauthorized switches being connected to the network or from misconfigured devices that could introduce loops.

Overall, BPDU guard enhances network stability and performance by proactively managing the potential for loops that can occur when untrusted devices mistakenly participate in the STP mechanism.