Which statement best describes PortFast in STP?

Which statement best describes PortFast in STP?

• A. It enables port transitions to forwarding state immediately on edge ports.
• B. It disables STP on all ports.
• C. It sets the root bridge to a fixed priority.
• D. It requires manual BPDU Guard configuration.

Answer: (A)

PortFast speeds up STP convergence by letting edge (access) ports move directly to the forwarding state as soon as a device is connected. Normally STP has a port go through blocking, listening, and learning before forwarding, which delays devices like a PC from communicating after you plug them in. PortFast skips that delay for ports that connect to end devices, so the host can start talking on the network right away. But this only makes sense on ports that truly connect to end devices. If a switch or another bridging device is connected to a PortFast-enabled port, it can create a temporary loop because the port starts forwarding without waiting for BPDUs. To reduce that risk, BPDU Guard can be enabled on PortFast ports so that if a BPDU is received, the port is shut down to prevent a loop. PortFast does not disable STP on the entire network, nor does it set the root bridge priority. Those are separate STP configurations. And while BPDU Guard is commonly used with PortFast, it isn’t mandatory, just a recommended safety measure.

PortFast speeds up STP convergence by letting edge (access) ports move directly to the forwarding state as soon as a device is connected. Normally STP has a port go through blocking, listening, and learning before forwarding, which delays devices like a PC from communicating after you plug them in. PortFast skips that delay for ports that connect to end devices, so the host can start talking on the network right away.

But this only makes sense on ports that truly connect to end devices. If a switch or another bridging device is connected to a PortFast-enabled port, it can create a temporary loop because the port starts forwarding without waiting for BPDUs. To reduce that risk, BPDU Guard can be enabled on PortFast ports so that if a BPDU is received, the port is shut down to prevent a loop.

PortFast does not disable STP on the entire network, nor does it set the root bridge priority. Those are separate STP configurations. And while BPDU Guard is commonly used with PortFast, it isn’t mandatory, just a recommended safety measure.