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| Section | Objectives |
|---|---|
| Topic 1: Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Coverage and capacity planning - Business and technical requirements gathering |
| Topic 2: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 3: Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| Topic 4: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 5: Wireless Security Design | - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration |
| Topic 6: RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
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質問 # 51
An engineer must perform a predictive design for a wireless network.
The customer has devices that can tolerate at most 100 ms of delay when roaming. Which design criteria must be used?
正解：C
解説：
Devices that can tolerate at most 100 ms of delay when roaming are voice devices. The 100 ms maximum roaming delay threshold is the Cisco-specified design criterion for VoWLAN implementations -- it defines the maximum time a handset can tolerate being disconnected from the wireless network during a roam event before the voice call is degraded or dropped. This threshold drives specific design requirements: 15-20% cell overlap at -67 dBm, fast roaming mechanisms (802.11r, CCKM, or OKC), and AP placement along user movement paths.
質問 # 52
A customer designs a Cisco wireless environment to provide connectivity to employees and guests. The guest SSID must be configured on three anchor WLCs named Anchor1, Anchor2, and Anchor3 in a DMZ. The guest anchor priority must be configured to ensure that Anchor1 has the highest priority. Which priority level must be incorporated in the design for Anchor1?
正解：A
解説：
In Cisco ' s guest anchor WLC deployment model, multiple anchor controllers can be configured in a DMZ to provide redundancy for guest WLAN traffic. The anchor priority value determines which anchor controller is preferred for establishing the guest mobility tunnel from the foreign WLC. Cisco ' s anchor priority system assigns the highest preference to the lowest numerical priority value. Priority 1 is the highest priority, meaning the foreign WLC will prefer Anchor1 when establishing the CAPWAP mobility tunnel for anchoring guest client traffic. Priority 2 would be assigned to Anchor2, and Priority 3 to Anchor3, creating a deterministic failover hierarchy. If Anchor1 becomes unreachable, the foreign controller automatically falls over to Anchor2, then to Anchor3. Priority 0 is not a valid anchor priority value in the Cisco WLC configuration. This design pattern is critical for enterprise guest deployments where DMZ anchor redundancy must be maintained without manual intervention. Reference: WLSD Study Guide - Guest Wireless Architecture, Anchor WLC Configuration, Mobility and DMZ Design.
質問 # 53
An engineer is designing a wireless solution for a corporate campus which includes two primary buildings: Research and Operations. The design must ensure seamless mobility for employees moving between buildings, support uninterrupted connectivity for real-time applications, and facilitate efficient Layer 2 and Layer 3 roaming. Each building's 9800-80 WLC manages its local APs, and the solution must support 802.11r/k/v while maintaining an effective mobility control plane. Which design approach leverages Cisco mobility group architecture to meet the requirements?
正解：C
解説：
Cisco's mobility group architecture enables seamless client roaming between WLCs by establishing a trusted peer relationship and shared mobility domain. When two Cisco Catalyst
9800-80 WLCs are placed in the same mobility group, they establish CAPWAP mobility tunnels enabling both Layer 2 and Layer 3 roaming with session continuity including IP address preservation. Within the same mobility group, WLCs exchange client state information, allowing
802.11r Fast BSS Transition, 802.11k neighbor reports, and 802.11v BSS Transition Management to function across controller boundaries. No specific primary or secondary roles are assigned within a mobility group -- all members are peers with equal standing for roaming purposes, which is precisely what Option D describes.
質問 # 54
A customer has a centralized wireless deployment with N+1 high availability and few open authentication SSIDs configured. After failover, all APs are broadcasting all SSIDs, but the clients are assigned IP addresses from a different subnet. The WLANs on both WLCs are configured with the same dynamic interfaces. Which feature must be incorporated in the wireless design of the second controller?
正解：D
解説：
VLAN Select is a feature that allows for the dynamic assignment of clients to different VLANs from a pool based on various criteria, such as load balancing or location. In a centralized wireless deployment with N+1 high availability, if clients are receiving IP addresses from a different subnet after failover despite the WLANs being configured with the same dynamic interfaces, the issue is that the second controller's WLAN interface mapping resolves to a different VLAN or DHCP scope. VLAN Select ensures that client VLAN assignment is consistent regardless of which controller the client connects to, preventing the subnet change behavior observed during failover.
Without VLAN Select, even identically named dynamic interfaces on two WLCs may map to different VLANs if the underlying switch configuration differs.
質問 # 55
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
正解：B
解説：
In Cisco ' s AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort - it should only receive AP associations when all other options are exhausted. Configuring the service/dev controller as the tertiary controller in the APs ' preference configuration ensures exactly this behavior: APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages. Configuring it as primary (Option A) or secondary (Option C) would allow APs to join the service controller before exhausting production options. AP failover priority (Option D) governs which APs are processed during controller recovery, not the controller preference order during join. Reference: WLSD Study Guide - AP Controller Preference Configuration, Primary/Secondary/Tertiary WLC Assignment, Hospital WLAN High Availability Design.
質問 # 56
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