Free Cisco 400-351 Exam Practice Questions & Explanations
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An engineer configures a Catalyst 9300 switchport for a FlexConnect AP that must locally switch traffic for three VLANs. The port is configured as an 802.1Q trunk with the AP management VLAN as the native VLAN and the locally switched VLANs allowed.
Statement: For a FlexConnect AP performing local switching of multiple VLANs, the switchport must be a trunk and VLAN support with a native VLAN ID must also be enabled on the AP itself.
True. Local switching of multiple VLANs requires the AP uplink to be an 802.1Q trunk, and the FlexConnect AP must have VLAN support enabled with a native VLAN ID matching the switch native VLAN (used for AP management/CAPWAP). Without VLAN support and a correct native VLAN on the AP, VLAN mapping for locally switched WLANs cannot be applied and the AP may lose its CAPWAP connection.
A hospital requires seamless roaming for 5 GHz voice handsets across a large floor. The design team proposes -67 dBm primary coverage with 20 percent cell overlap, and enables 802.11k, 802.11v and 802.11r on the voice WLAN. During validation, handsets still perform full reassociation with 802.1X, causing audible gaps.
Which is the most likely cause?
If clients lack 802.11r support, they cannot use FT; when the WLAN advertises FT AKM only, such clients either fail or fall back to full 802.1X reassociation. Enabling FT in adaptive/mixed mode so both FT and the standard AKM suites are advertised allows fast roaming for capable clients and normal (or OKC/PMK caching) behavior for others.
802.11k does not require CCX 5. Standard voice design uses roughly 15 to 20 percent overlap, not over 50 percent. 802.11v and 802.11r coexist. FT works with WPA2/WPA3-Enterprise and PSK; 192-bit Suite-B is not a requirement.
A Catalyst 9800-CL controller is deployed in local mode with APs on a Catalyst 9300 access layer. New APs at a remote closet never join; CAPWAP discovery packets are seen leaving the AP but the AP repeatedly falls back to DHCP discovery. The APs receive an IP address and default gateway correctly, and DNS resolution of CISCO-CAPWAP-CONTROLLER fails.
Which wired infrastructure configuration resolves the join issue with the least administrative overhead?
When APs are in a different subnet from the WLC, Layer 3 discovery requires either DNS or DHCP option 43. Option 43 with sub-option 0xf1 (TLV listing WLC management IPs) is the standard, low-overhead solution.
Option 60 is sent by the AP as its vendor class identifier, not configured on the SVI to help discovery. Directed broadcast is not used for CAPWAP discovery to a unicast controller. Native VLAN placement does not solve L3 discovery. There is no primary-base command on a switchport; primary/secondary controller names are set on the AP or WLC.
You are designing an outdoor point-to-point bridge link using Cisco autonomous outdoor APs in the 5 GHz band across a 12 km span. During validation, the link comes up but throughput collapses and you see high retries plus many ACK timeouts.
Which configuration action most directly addresses the root cause of this behavior?
On long-range bridge links, propagation delay exceeds the default ACK timeout, causing retries and throughput collapse. The distance command tunes ACK/slot timers for the link span.
802.11b rates are not valid in 5 GHz. DFS must match on both ends and disabling it on one side is not the cause. Raising power does not fix timing and may violate EIRP limits. Load balancing is a client feature, irrelevant to a bridge link.
A customer deploys Wi-Fi 6 (802.11ax) APs in a high-density lecture hall. The RF engineer wants to reduce contention overhead for the many small-frame clients (voice and telemetry) associating to each AP, and to allow the AP to schedule multiple clients within a single transmit opportunity in both directions.
Which 802.11ax mechanism directly provides this capability?
OFDMA subdivides a channel into resource units so the AP can serve multiple clients simultaneously in one TXOP; uplink OFDMA is scheduled by the AP using trigger frames. This is the mechanism that reduces per-frame contention overhead for many small frames.
MU-MIMO in 802.11ax is bidirectional but relies on spatial streams and is inefficient for small frames. TWT is a power-save scheduling feature, not a multiplexing efficiency feature. 1024-QAM only raises peak data rate under excellent SNR. BSS Color aids spatial reuse between overlapping BSSs, not intra-BSS multi-user scheduling.