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21. Frage
How does the optimized roaming function operate in a WLC implementation?
Antwort: C
Begründung:
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
22. Frage
Which role does a fabric edge node perform in a Cisco wireless fabric architecture?
Antwort: C
Begründung:
In a Cisco wireless fabric architecture, fabric edge nodes are responsible for terminating user data traffic at the network edge. These nodes act as the first point of contact for client devices, handling tasks such as encryption
/decryption, VLAN tagging, Quality of Service (QoS) enforcement, and traffic forwarding to the appropriate destination within the fabric. The design centralizes control-plane functions in fabric control nodes, while edge nodes focus on data-plane operations to reduce latency and optimize network performance. Option A, authenticating TLS connections for management, is handled by management or control-plane components rather than edge nodes. Option B, enabling multicast snooping, is a network switch function but not a core responsibility of fabric edge nodes. Option D, converting Layer 2 to Layer 3 addresses, is part of routing functions and not a dedicated role of the wireless fabric edge node in client data processing. Cisco Wireless Core Technologies emphasize that by terminating user data at the edge, fabric edge nodes enable efficient traffic handling, secure processing, and scalable wireless deployment, which is critical in high-density enterprise environments. Reference topics:Wireless Network Operation - Cisco wireless fabric architecture, fabric edge node role, user data termination, data-plane operations.
23. Frage
Refer to the exhibit.
A wireless controller is deployed at a branch location to facilitate guest client connectivity. A network engineer configures one WLAN using Web authentication and activates web-based method to align with company security policies. Which configuration enables client authentication for this WLAN?
Antwort: C
Begründung:
The command that enables web-based client authentication on the WLAN issecurity web-auth. Cisco's Catalyst 9800 Web-Based Authentication guide shows the WLAN configuration workflow: enter WLAN configuration mode, disable WPA security for the open Layer 2 guest WLAN, then "Enable web authentication for WLAN" usingsecurity web-auth. Cisco then applies the authentication list and parameter map withsecurity web-auth authentication-list ...andsecurity web-auth parameter-map ..., which refine the WebAuth method and portal behavior after WebAuth itself is enabled.
Cisco's LDAP authentication example mirrors the exhibit exactly:wlan webauth 2 webauth, removal of WPA
/802.1X Layer 2 security,security web-auth,security web-auth authentication-list ldapauth, andsecurity web- auth parameter-map global. Option B only creates or enters the WLAN profile with WLAN ID 2 and SSID name. Options C and D disable WPA2 and 802.1X AKM; they do not authenticate clients. Reference topics:
Client Connectivity Configuration - guest WLAN authentication, WebAuth, Layer 3 security, authentication lists, parameter maps, and Catalyst 9800 WLAN security configuration.
24. Frage
Which solution enables a seamless user experience when roaming in a wireless network?
Antwort: C
Begründung:
Fast transition is the correct solution because it refers to IEEE 802.11r Fast BSS Transition, which reduces the authentication delay when a wireless client roams from one AP to another. Cisco describes 802.11r Fast Transition as a feature for seamless wireless roaming and states that, after configuration, the WLAN supports faster client roaming between access points. Cisco's Catalyst 9800 roaming documentation also identifies
802.11r as the mechanism focused on seamless transition between APs, while 802.11k and 802.11v assist with neighbor reporting and network-assisted roaming decisions.
The core advantage is that key negotiation and authentication preparation occur before or during the roam, reducing the interruption experienced by latency-sensitive applications such as voice, video, collaboration tools, and real-time enterprise applications. Static VLAN policy only controls segmentation and does not accelerate roaming. Optimized roaming can help discourage sticky clients from remaining associated to poor- quality APs, but it is not the primary fast-roam authentication mechanism. A redundant RF profile is not an
802.11 roaming solution. Reference topics:802.11r Fast BSS Transition, client roaming, WLAN mobility behavior, Catalyst 9800 WLAN security, and seamless roaming design.
25. Frage
A wireless engineer notices high retransmission rates on a WLAN supporting IoT devices operating at low data rates. Which configuration change is MOST appropriate?
Antwort: A
Begründung:
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.
26. Frage
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