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NEW QUESTION # 38
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?
Answer: A
Explanation:
The correct configuration is aaa-override followed by nac under 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.
NEW QUESTION # 39
What does an elevated noise floor indicate in an RF environment?
Answer: A
Explanation:
An elevated noise floor indicates degraded RF conditions and directly reduces wireless link reliability. Cisco defines the noise floor as the ambient RF noise level, expressed in dBm, below which received signals are unintelligible. Cisco also defines SNR as the ratio of signal strength to the noise floor, meaning that when the noise floor rises, the usable separation between the desired signal and background RF energy decreases.
For a receiver to decode frames reliably, the received signal must remain sufficiently above the noise floor.
Cisco site-survey guidance states that RF signals must be higher than the noise floor to be detectable as valid useful signals, and gives the common design example of -67 dBm signal with a -92 dBm noise floor to maintain 25 dB SNR. When the noise floor is elevated, SNR drops, clients experience more retries, lower modulation rates, reduced throughput, and possible disconnects. Cisco's high-density wireless guidance states that raised noise floor lowers SNR, translating to lower speeds and higher airtime utilization. Options B, C, and D describe unrelated timing, spectrum-planning, or bandwidth-demand concepts. Reference topics:RF Fundamentals - noise floor, SNR, RSSI, RF interference, retries, and wireless link quality.
NEW QUESTION # 40 
Refer to the exhibit. An engineer must configure a wireless guest WLAN, which requires clients to use VLAN
10 for a deployment at site A. Based on the configuration commands shown, which additional configuration meets the requirements?
Answer: C
Explanation:
In Cisco Catalyst 9800 WLAN configurations, assigning a VLAN to a WLAN is done using theaccess vlan < vlan-id > command under the WLAN context. This ensures that clients associating with the guest SSID are placed in the correct Layer 2 VLAN for proper segmentation and network access. The exhibit shows that security features are removed and the WLAN is operational, but no VLAN is yet assigned. Option A correctly usesaccess vlan 10under the WLAN configuration, enabling client traffic to be tagged or untagged into VLAN
10 for site A deployment. Option B is invalid syntax; simply usingvlan 10is insufficient and not recognized in IOS XE WLAN configuration. Options C and D involvepolicy profilecommands, which define WLAN policies but do not directly assign the VLAN to the guest WLAN itself. Cisco Wireless Core Technologies emphasize that proper VLAN assignment ensures guest isolation, correct DHCP assignment, and traffic segregation, which is critical for security and compliance in enterprise deployments. Assigning the VLAN in this manner also allows downstream switches to correctly forward traffic to the intended network segment.
Reference topics:Client Connectivity Configuration - WLAN VLAN assignment, guest SSID, access vlan, Cisco Catalyst 9800.
NEW QUESTION # 41
What is a characteristic of 20 MHz channel width in a wireless network?
Answer: D
Explanation:
In wireless networks, the 20 MHz channel width is the standard and narrowest channel allocation in the 2.4 GHz frequency band. Using narrower channels reduces adjacent-channel interference and allows for better coexistence in high-density environments, which is particularly important in the crowded 2.4 GHz spectrum.
A 20 MHz channel uses less RF bandwidth than 40 MHz or 80 MHz channels, providing more non- overlapping channels (channels 1, 6, and 11 in 2.4 GHz) to reduce co-channel interference. Option B is incorrect, as channel width does not inherently increase authentication handoff frequency; handoff behavior is determined by RSSI, client roaming thresholds, and 802.11r fast roaming settings. Option C describes client reassociation support, which is handled by the wireless controller and client firmware, not the channel width itself. Option D is incorrect because wider channels (40 MHz, 80 MHz) provide higher throughput than 20 MHz, at the expense of increased interference potential. Cisco Wireless Core Technologies emphasize that 20 MHz channels are preferred for dense deployments in the 2.4 GHz band to maximize non-overlapping channels and reduce interference, ensuring predictable coverage and reliable client connectivity. Reference topics:RF Fundamentals - 20 MHz channels, 2.4 GHz spectrum planning, interference management, channel allocation.
NEW QUESTION # 42
Which feature enables fast secure roaming in a wireless network?
Answer: A
Explanation:
Fast secure roaming in enterprise wireless networks is achieved using the 802.11r standard, also known as Fast BSS Transition (FT). 802.11r allows clients to authenticate with a new access point (AP) before disassociating from the current AP, significantly reducing the time required for the re-authentication process.
This pre-authentication mechanism ensures that client sessions, such as voice or video calls, are maintained seamlessly when moving between APs in a mobility domain. DCA (Dynamic Channel Assignment) optimizes channel selection but does not affect roaming speed. 802.11ax enhances overall throughput and spectral efficiency but does not directly provide fast roaming. MIMO (Multiple Input Multiple Output) improves signal reliability and capacity but is unrelated to the authentication handoff process. Cisco Wireless Core Technologies highlight the deployment of 802.11r in conjunction with PMK caching and Opportunistic Key Caching (OKC) to further accelerate roaming in high-density environments. Implementing 802.11r is critical for environments requiring minimal packet loss and low latency during client movement, such as voice over Wi-Fi or real-time video applications. Reference topics:Client Connectivity Configuration - 802.11r, Fast BSS Transition, secure fast roaming, mobility domains, PMK caching.
NEW QUESTION # 43
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