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질문 # 13
Exhibit:
Refer to the exhibit. An enterprise is deploying Cisco Catalyst 9800 WLCs and is using Catalyst Center as the management platform to oversee wireless access policies. To meet the organization's compliance requirements, all wireless endpoints must be evaluated with security posture validation before gaining access.
Which set of CLI commands must be added to the box in the code to complete the configuration?
정답：A
설명：
The correct configuration isaaa-overridefollowed bynacunder the existing Catalyst 9800 wireless policy profile. The exhibit already places the administrator in policy-profile configuration mode with wireless profile policy my-policy, so the missing commands must be policy-profile subcommands, not another profile declaration. Cisco's Catalyst 9800 configuration examples show the exact sequence: enter wireless profile policy < policy-profile-name > , enable aaa-override, enable nac, then configure VLAN and no shutdown.
aaa-override permits authorization attributes returned by AAA or Cisco ISE, such as VLAN, ACL, QoS, redirect ACL, or posture-related access controls, to override the locally defined policy. Cisco's documentation explicitly states that AAA override applies policies coming from AAA or ISE servers, while nac enables Network Access Control in the policy profile. This is the required behavior when endpoints must be posture- validated before normal network access is granted. Cisco also notes that NAC State is enabled in the policy profile and can only be enabled when AAA override is enabled.
Option A is invalid because nac-policy is not the correct CLI keyword. Options B and D omit NAC.
Reference topic:Client Connectivity Configuration - Catalyst 9800 policy profiles, AAA override, NAC State, posture enforcement, and ISE-based access control.
질문 # 14
How does the optimized roaming function operate in a WLC implementation?
정답：C
설명：
Optimized roaming is a Cisco WLC feature designed to reduce sticky-client behavior. A sticky client remains associated to an AP even after moving far enough away that another AP would provide better RF service.
Cisco describes optimized roaming as actively monitoring client data RSSI and disconnecting clients when received signal strength falls below the configured threshold. The official Catalyst 9800 documentation states that optimized roaming "disassociates client when the RSSI is lower than the set threshold," which directly matches option A.
This function does not calculate device location through peer-to-peer beaconing, does not depend on external experience services, and is not static load balancing. It is an RF/client-roaming enforcement mechanism controlled by the wireless infrastructure. In practical operation, the AP/WLC evaluates client signal quality and, when the configured optimized roaming criteria are met, forces the client to disconnect so it can reassess the RF environment and roam to a better AP. Cisco also notes that optimized roaming helps maintain client connectivity by managing disassociationn based on RSSI and data-rate thresholds. Reference topics:Client Connectivity Configuration - client roaming behavior, sticky-client mitigation, RSSI thresholds, and WLC roaming optimization
질문 # 15
A school district is deploying Cisco Catalyst 9176 APs to remote sites with occasional WAN outages. The IT team wants the APs to attempt joining a secondary or tertiary Catalyst 9800 WLC if the primary controller is unreachable. The team must preconfigure all controller IP addresses using the AP CLI before deploying.
Which set of CLI commands sets the primary, secondary, and tertiary controller IP addresses on a Catalyst
9176 AP?
정답：B
설명：
Cisco lightweight and Catalyst access points use CAPWAP for AP-to-controller discovery and join operations. For AP-side preconfiguration, Cisco documents the syntax as capwap ap {primary-base | secondary-base | tertiary-base} controller-name controller-ip-address, specifically for configuring primary, secondary, and tertiary controllers on the AP. This matches option B exactly because it includes the CAPWAP AP command, the controller priority keyword, the controller name, and the controller management IP address. (Cisco) The Catalyst 9800 AP join process also recognizes these configured controller entries in priority order:
primary controller using capwap ap primary-base, secondary controller using capwap ap secondary-base, and tertiary controller using capwap ap tertiary-base. (Cisco) This allows the AP to attempt a backup controller when the preferred controller is unavailable, which is appropriate for remote sites with intermittent WAN reachability. Option A uses obsolete or invalid setcontroller syntax. Option C invents an ap join command format. Option D incorrectly inserts wlc into the AP CAPWAP command. Reference topics:Wireless Network Implementation -CAPWAP discovery, AP join process, Catalyst 9800 controller redundancy, and AP CLI provisioning.
질문 # 16
In an RF environment, what does high interference result in?
정답：B
설명：
High interference in a wireless RF environment disrupts the predictable behavior of 802.11 channels. Interference comes from co-channel devices, neighboring APs, non-Wi-Fi sources like microwave ovens, cordless phones, or other electronic equipment operating in the same frequency band. When interference is present, the channel experiences fluctuating noise levels, increased frame collisions, and packet loss, all of which lead to inconsistent channel performance.
This inconsistency manifests as variable throughput, increased retransmissions, and irregular latency, directly impacting both client experience and AP scheduling decisions. While frame aggregation may fail under interference, the primary and systemic effect is the variability in channel quality, not the failure of aggregation alone. Scheduled contention access (option C) is an intentional protocol mechanism of EDCA or TXOP scheduling, which operates independently of interference levels. Extended coverage patterns (option D) are the result of antenna design or AP placement, not RF interference.
Cisco's Wireless Design Guide emphasizes that RF interference results in erratic channel behavior, requiring careful channel planning, power adjustment, and spectrum analysis using tools such as Cisco DNA Spaces or Spectrum Expert to restore consistent performance.
질문 # 17
A wireless engineer deploys multicast video streaming over WLANs. Clients experience excessive unnecessary traffic consumption. Which feature optimizes multicast delivery to wireless clients?
정답：D
설명：
Multicast-to-unicast conversion improves wireless efficiency by converting multicast streams into individual unicast frames transmitted at higher data rates. Native multicast often uses low basic rates, consuming excessive airtime. VLAN assignment and fragmentation do not directly optimize multicast delivery efficiency.
질문 # 18
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