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NEW QUESTION # 83
In an RF environment, what does high interference result in?
Answer: B
Explanation:
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.
NEW QUESTION # 84
Which CleanAir feature is used to avoid channels with interference from devices such as outdoor bridges and microwave ovens?
Answer: D
Explanation:
Cisco CleanAir technology is designed to detect, classify, and mitigate RF interference in enterprise wireless networks. Persistent Device Avoidance is a CleanAir feature that identifies non-Wi-Fi sources of interference, such as microwave ovens, outdoor bridges, or other RF devices, and then instructs the wireless LAN controller (WLC) to avoid channels affected by these interferers. By doing so, APs can select cleaner channels, reducing packet loss, improving throughput, and maintaining optimal coverage. Spectrum Analysis (Option B) provides visibility into the RF environment and interference sources but does not automatically avoid channels. Air Quality Index (Option C) gives a real-time assessment of RF quality per channel but is a monitoring metric, not an avoidance mechanism. Channel Utilization (Option D) reports on the percentage of channel occupancy by Wi-Fi traffic, assisting in load balancing, but does not prevent interference from external sources. Persistent Device Avoidance ensures proactive channel selection in environments with consistent interference, enhancing overall network reliability and performance. This capability is critical in high-density or mixed-use environments, where interference from non-Wi-Fi devices can degrade client experience. Reference topics:Wireless Network Operation - Cisco CleanAir, Persistent Device Avoidance, RF interference mitigation, channel optimization.
NEW QUESTION # 85
Refer to the exhibit. A network administrator must configure a client management parameter for a wireless deployment in a multi-site enterprise. The enterprise is using Cisco ISE as the management platform to oversee wireless access policies. To meet the organization's compliance requirements, all wireless endpoints must be evaluated against a posture policy before gaining access. Which configuration change must be applied on the WLAN level of the WLC to meet the requirement?
Answer: B
Explanation:
To enforce endpoint compliance using Cisco ISE, the WLC must allow AAA policies configured on the ISE to override the WLAN default access policies. Enabling aaa-override on the WLAN allows the WLC to apply RADIUS-supplied attributes from Cisco ISE, including user roles, VLAN assignment, and posture evaluation outcomes, to connected clients. This is essential for enterprise environments where a posture policy (e.g., checking device security posture, anti-virus status, OS updates) must be applied prior to granting full network access.
NEW QUESTION # 86
What does an elevated noise floor indicate in an RF environment?
Answer: C
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 # 87
A network administrator at a marketing company manages a Cisco Catalyst 9800 Series Wireless Controller running Cisco IOS XE 17.x. The WLAN named XYZ-Guest is set up for visitors, and the administrator wants to implement a web authentication (WebAuth) portal using an external server to manage guest access. To ensure seamless and secure guest authentication, the controller must be configured to use an external WebAuth server for the WLAN. The administrator must configure the XYZ-Guest WLAN to use an external WebAuth server with a parameter map named webauth-ext. Which set of Cisco IOS XE commands must be used?
Answer: A
Explanation:
On a Cisco Catalyst 9800 WLC, the WLAN is entered with the wlan command, and the WebAuth parameter map is applied under the WLAN using the security web-auth parameter-map command so the guest WLAN uses the configured external WebAuth portal settings.
NEW QUESTION # 88
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