The verified answer is B. STP can temporarily prevent a workstation from receiving a DHCP address because the port may not forward immediately. Without PortFast, an access port can spend time in spanning-tree transitional states before forwarding DHCP traffic. Cisco CCNA 200-301 v1.1 places this skill in Network Access, where the exam expects a working understanding of how the feature behaves on real Cisco networks, not just a memorized command. DTP and VTP handle trunking and VLAN propagation, and 802.10 is not the cause in this access-port scenario. In production, this distinction matters because a misapplied command or design choice usually creates an outage, a security gap, or unnecessary troubleshooting noise. The correct choice matches the control-plane, data-plane, wireless, security, or services behaviour described in the scenario and should be preferred over options that merely sound related.
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