PortFast is the spanning-tree enhancement that allows an edge port to transition directly to forwarding instead of waiting through the traditional listening and learning delays. It is intended for ports connected to end hosts, not for switch-to-switch links. If a switch is connected to a PortFast port by mistake, a loop can form unless protections such as BPDU Guard are used. BPDU Guard and BPDU Filter affect BPDU handling; they are not the feature that bypasses listening and learning. BackboneFast is a legacy convergence enhancement for indirect link failures, not an edge-port feature. Cisco CCNA 200-301 v1.1 Network Access tests PortFast because it directly affects host startup, DHCP behavior, and access-layer convergence. The phrase ' immediately places ports in the forwarding state ' points directly to PortFast. The correct answer is B.
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