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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 2: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 3: Wireless Security Design | - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration |
| Topic 4: Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Coverage and capacity planning - Physical environment assessment and constraints |
| Topic 5: Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) - Mobility groups and roaming design |
| Topic 6: RF Fundamentals and Design Principles | - Channel planning and interference mitigation - Antenna types and placement strategies - RF behavior and propagation |
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NEW QUESTION # 77
An enterprise network is deploying two Cisco Catalyst 9800 WLCs in a data center to ensure uninterrupted wireless services for a campus with thousands of users. The IT management requests a design that enables seamless failover without client reauthentication or loss of connectivity if one controller fails. Ease of configuration and ongoing management are high priorities. The controllers will be connected via a high-speed LAN segment, and both must support full active-passive redundancy for all managed APs. Which design approach meets the requirements?
Answer: A
Explanation:
Cisco Stateful Switchover (SSO) on the Catalyst 9800 platform is the definitive high availability solution when requirements specify zero client reauthentication during failover, active-passive redundancy, and ease of management. With SSO enabled, the active and standby 9800 WLCs maintain a synchronized state database via a dedicated redundancy link -- this includes all client association state, authentication credentials, AP join information, and WLAN configurations.
When the active controller fails, the standby assumes control instantaneously with no CAPWAP session teardown and no 802.1X reauthentication required. The Redundancy Management Interface (RMI) provides a dedicated in-band keepalive and state synchronization path.
NEW QUESTION # 78
An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?
Answer: C
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non- routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with. If different virtual IP addresses were used (Option B), clients roaming between controllers would experience DHCP failures during inter-controller roaming because the DHCP server address seen by the client would change. Options A and C relate to DNS hostname configuration, which is useful for AP discovery but does not affect the roaming behavior of client devices. The virtual IP address consistency across all mobility group members is a fundamental requirement for seamless inter-controller roaming. Reference: WLSD Study Guide - Mobility Group Configuration, Virtual IP Address, Inter- Controller Roaming Requirements.
NEW QUESTION # 79
A wireless engineer must design a backhaul link. The engineer has a mesh access point that has a wired connection back to the infrastructure. What must be changed in the AP role before a change is made in the AP mode?
Answer: A
Explanation:
In Cisco mesh networking architecture, access points are classified into two primary roles: Root Access Points (RAP) and Mesh Access Points (MAP). A RAP is an access point that maintains a wired Ethernet backhaul connection back to the network infrastructure, while a MAP operates wirelessly, relying on mesh backlinks to upstream RAPs. When an engineer needs to change an AP mode - such as switching to bridge mode to extend the mesh - the AP role must first be defined correctly. The AP must be designated as a RAP before any mode-level configuration changes are applied. This sequencing is critical because the AP role defines the fundamental backhaul path; changing the mode without first establishing the role results in misconfiguration and potential connectivity loss. The RAP communicates directly with the wired infrastructure via its Ethernet port, making it the gateway for all downstream MAPs in the mesh topology. Options A (monitor), C (bridge), and D (local) refer to AP modes, not roles, and cannot be configured until the role is properly defined.
Reference: WLSD Study Guide - Mesh Networking Fundamentals, Outdoor Wireless Design, AP Role and Mode Configuration.
NEW QUESTION # 80
After deployment, a customer requires proof that the installed WLAN meets the agreed coverage specification. Which survey type should the engineer perform?
Answer: A
Explanation:
A post-deployment validation survey is conducted after the APs are permanently mounted and configured with their production channel and power settings, and it involves physically walking the space with a survey tool to measure actual RSSI, SNR, noise floor, channel overlap, data rates, and roaming behavior against the agreed design specification. Only this method produces evidence of what the deployed network delivers in the real environment, including the effects of furniture, inventory, and construction that no model fully predicts. A predictive survey is a design- phase estimate and proves nothing about the installed system. A spectrum-only survey characterizes interference sources but does not measure coverage. An AP-on-a-stick survey is a pre-deployment technique used to empirically determine AP placement and quantity by temporarily positioning an AP and measuring propagation - valuable earlier in the process, but it is not a validation of the finished installation.
NEW QUESTION # 81
Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?
Answer: B
Explanation:
In a high-availability configuration with multiple WLCs in a mobility group, when APs that only have a primary controller configured become orphaned (their primary WLC fails), they will by default join the controller with the lowest percentage of associated APs per license capacity. This load-based selection mechanism ensures a balanced distribution of APs across the remaining controllers in the mobility group. The WLC with the lowest percentage of AP capacity utilized is chosen because it has the most headroom to accept additional APs without becoming overloaded. This prevents a single backup controller from becoming overwhelmed while others remain underutilized. The selection is not based on absolute number of APs (Option D), available free licenses in absolute terms (Option A), or CPU utilization (Option C) - it specifically uses the percentage of license capacity occupied, which normalizes across controllers with different total AP capacities. Reference: WLSD Study Guide - N+1 Redundancy Default Behavior, AP Orphan Failover Logic, WLC Load-Based AP Assignment.
NEW QUESTION # 82
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