A network administrator uses the spanning-tree portfast bpduguard default global configuration command to enable BPDU guard on a switch. However, BPDU guard is not activated on all access ports. What is the cause of the issue?

IT Questions Bank › Category: CCNA › A network administrator uses the spanning-tree portfast bpduguard default global configuration command to enable BPDU guard on a switch. However, BPDU guard is not activated on all access ports. What is the cause of the issue?

Question:
A network administrator uses the spanning-tree portfast bpduguard default global configuration command to enable BPDU guard on a switch. However, BPDU guard is not activated on all access ports. What is the cause of the issue?

BPDU guard needs to be activated in the interface configuration command mode.
Access ports configured with root guard cannot be configured with BPDU guard.
Access ports belong to different VLANs.
PortFast is not configured on all access ports.

Explanation: BPDU guard can be enabled globally on all PortFast-enabled ports by using the spanning-tree portfast bpduguard default global configuration command. If PortFast is not configured, then BPDU guard is not activated.

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