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NEW QUESTION # 119 
A network administrator is working on a Cisco Catalyst 9800 WLC running Cisco IOS XE Software to enable user access for staff smartphones using WPA2-Enterprise with RADIUS. The administrator verifies the external authentication configuration and plans to test network connectivity. Which configuration command must be added to the box in the code to configure the WLC to support authentication with an external server?
Answer: C
Explanation:
To enable WPA2-Enterprise with RADIUS authentication on a Cisco Catalyst 9800 WLC, the WLAN configuration must specify the use of 802.1X as the authentication mechanism. The commandsecurity wpa wpa2 akm dot1xexplicitly instructs the WLAN to use WPA2 encryption with the 802.1X authentication key management (AKM), which leverages the configured RADIUS server group for client authentication. Option B (security dot1x authentication-list) and Option C (security dot1x method-list) are legacy or IOS-style commands that define AAA method lists but do not directly bind the WLAN to WPA2-Enterprise security.
Option A (security wpa enable) only enables WPA but does not define the authentication mode or RADIUS integration, which is insufficient for WPA2-Enterprise deployments. Cisco Wireless design guides emphasize that for staff or enterprise-class WLANs using external RADIUS servers, the WLAN's security profile must use WPA2 with AKM set to 802.1X. This ensures clients perform EAP authentication with the external server, supporting secure credential exchange and proper authorization. Correctly applyingsecurity wpa wpa2 akm dot1xin the WLAN configuration guarantees the WLC enforces encryption and authentication policies in line with enterprise security requirements. Reference topics:Client Connectivity Configuration - WPA2- Enterprise, 802.1X, AKM, RADIUS integration on Cisco WLCs.
NEW QUESTION # 120
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.
NEW QUESTION # 121
Which process allows continuous IP address retention in a wireless network during roaming?
Answer: B
Explanation:
Layer 3 roaming is the process that allows a wireless client to retain its original IP address when roaming across different Layer 3 client subnets or controller client VLAN contexts. Cisco describes intercontroller Layer 3 roaming as occurring when wireless LAN interfaces are on different IP subnets. During this roam, the controllers exchange mobility messages, but instead of simply moving the client database entry, the original controller marks the client as anAnchor, while the new controller marks the copied client entry asForeign.
Cisco explicitly states that the roam remains transparent to the wireless client and that the client maintains its original IP address.
NEW QUESTION # 122 
Refer to the exhibit. A client authenticates via 802.1X against an ISE server that is configured to return a specific VLAN ID (VLAN 100) via an attribute value pair. However, the administrator notices that the client is placed in the wrong VLAN (VLAN 50). What must the administrator implement to resolve the issue?
Answer: D
Explanation:
In this scenario, the client is placed in the wrong VLAN (VLAN 50) even though the ISE server is configured to assign VLAN 100. The key part of the issue is that the VLAN assignment returned by ISE is not being applied correctly.
Option A: "Configure the policy profile to allow ISE to override the VLAN."This is the correct answer. The policy profile on the Wireless LAN Controller (WLC) should be configured to allow the ISE server's VLAN assignment to override the locally configured VLAN settings on the WLC. Without this, the WLC might default to its pre-configured VLAN (VLAN 50) instead of the VLAN assigned by ISE (VLAN 100).
Option B: "Configure VLAN 100 as an SVI on the WLC."This option is unnecessary. While an SVI (Switched Virtual Interface) is required to route between VLANs, it is not the cause of the issue here. The problem is that the correct VLAN (VLAN 100) is not being applied to the client, not that the WLC lacks an SVI.
Option C: "Configure VLAN 100 on the trunk ports of the WLC."This option is also not relevant. The issue is not with trunking but with VLAN assignment from ISE. The trunking configuration ensures that VLANs are allowed across ports, but it does not address the client being placed in the wrong VLAN.
Option D: "Configure AAA VLAN enable on the WLAN."This option is not directly related to the issue.
While enabling AAA VLAN can allow for more dynamic VLAN assignments, the core issue is related to overriding the default VLAN setting from ISE, which is handled by configuring the policy profile on the WLC.
Therefore,Option Ais the correct solution, as it ensures the WLC will allow the ISE server's VLAN assignment to override the default VLAN on the WLC, resolving the issue of incorrect VLAN assignment.
NEW QUESTION # 123
A wireless engineer notices high retransmission rates on a WLAN supporting IoT devices operating at low data rates. Which configuration change is MOST appropriate?
Answer: A
Explanation:
Disabling extremely low data rates improves airtime efficiency and reduces retransmissions caused by slow clients occupying the channel excessively. However, engineers must verify device compatibility before removing legacy rates. DTIM and RADIUS settings are unrelated to RF retransmission optimization.
NEW QUESTION # 124
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