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Forward-time is the Rapid PVST+/STP timer that controls the listening and learning periods before a port is allowed to forward user traffic. The command spanning-tree vlan 1 forward-time 20 sets that timer for VLAN 1 to 20 seconds. The other commands tune different STP values: max-age controls how long bridge protocol information is retained, hello-time controls BPDU transmission frequency, and priority affects root-bridge election. For CCNA 200-301 v1.1 Network Access, the key distinction is that a port must listen, then learn MAC addresses, then forward. Cisco Catalyst documentation describes forward time as the value that determines how long the listening and learning states last before forwarding begins. Because the question specifically says the switch “listens and learns for a specific time period,” the only command that directly matches that behavior is the VLAN forward-time command. Reference: Cisco Catalyst Spanning Tree configuration guidance; CCNA 200-301 v1.1 Network Access objectives.

The verified answer is C. A Layer 2 switch floods an unknown unicast frame when the destination MAC address is missing from its MAC address table. The flood is limited to ports in the same VLAN and excludes the ingress port where the frame arrived. 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. The switch does not drop the frame immediately, send it back out the receiving port, or wait for the aging timer to expire. 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.

Use B for this item. The spanning-tree root bridge is selected by the lowest bridge ID for the VLAN. The bridge ID combines bridge priority and MAC address, so the switch with the numerically lowest effective value becomes root for VLAN 110. In Cisco CCNA 200-301 v1.1, Network Access questions frequently test the practical boundary between similar features: what the feature does, where it is configured, and what problem it is meant to solve. Physical placement and port count do not decide the STP root; only the STP election values do. A clean way to validate the answer is to map the wording of the scenario to the actual device function. If the feature supplies addressing, forwarding, authentication, trunking, route selection, or controller communication, the answer must match that function exactly rather than a nearby protocol name.

On an 802.1Q trunk, the native VLAN is the VLAN whose traffic is sent untagged. If the administrator wants VLAN 67 to be untagged while all other VLANs remain tagged, the trunk native VLAN must be changed to 67. The correct command is switchport trunk native vlan 67. Setting switchport access vlan 67 would affect an access port, not trunk tagging behavior. switchport trunk allowed vlan 67 would restrict which VLANs are permitted over the trunk rather than making VLAN 67 untagged. A private VLAN association command is unrelated to 802.1Q trunk native VLAN handling. Cisco CCNA 200-301 v1.1 Network Access expects engineers to understand the difference between access VLANs, allowed VLAN lists, and native VLANs. The native VLAN must match on both sides of the trunk to avoid VLAN leakage and inconsistent forwarding. Here the requirement is explicitly about untagged trunk traffic, so D is the only precise command.