300-320 Question #324: Real Exam Question with Answer & Explanation

The correct answer is A: Port Fast. PortFast is a Cisco STP enhancement that allows an access port (connected to an end device like a PC or server) to transition immediately from Blocking to Forwarding, skipping the Listening (15 sec) and Learning (15 sec) states. This eliminates the 30-second delay that would othe

Question

Which STP feature allows an access port to bypass the learning and listening?

Options

APort Fast
BBPDU Guard
CBPDU Filter
DUplinkFast

Explanation

PortFast is a Cisco STP enhancement that allows an access port (connected to an end device like a PC or server) to transition immediately from Blocking to Forwarding, skipping the Listening (15 sec) and Learning (15 sec) states. This eliminates the 30-second delay that would otherwise prevent end devices from obtaining DHCP addresses or connecting quickly. PortFast should only be enabled on ports connected to end hosts, never on trunk ports or switch-to-switch links, to avoid bridging loops. BPDU Guard is typically deployed alongside PortFast to shut down the port if a BPDU is received, while BPDU Filter suppresses BPDUs. UplinkFast accelerates uplink failover, not access port convergence.

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