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| Section | Objectives |
|---|---|
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Business and technical requirements gathering - Coverage and capacity planning |
| Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) - Mobility groups and roaming design |
| Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| RF Fundamentals and Design Principles | - RF behavior and propagation - Antenna types and placement strategies - Channel planning and interference mitigation |
| Wireless Security Design | - Guest access and segmentation strategies - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration |
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質問 # 70
A wireless network consists of two IOS XE controllers installed in a data center, 9100 series APs, and a corporate and a guest WLAN. The customer must have a high availability pair of two Cisco WLCs for the client SSO. Which two design approaches must the engineer take to meet the requirement? (Choose two.)
正解：C、E
解説：
Configuring a high availability SSO pair on Cisco Catalyst 9800 IOS XE WLCs has specific technical prerequisites that must be satisfied for the SSO relationship to form and function correctly. The two critical requirements are: each WLC must have a unique Redundancy Management Interface (RMI) IP address (Option B), and both WLCs must run identical IOS XE software versions (Option D). The Redundancy Management Interface is the dedicated in-band control channel over which the active and standby WLCs exchange state synchronization information, keepalive messages, and configuration updates. Each controller requires its own unique RMI IP address within the same subnet - the active uses one address and the standby uses another. If they shared the same RMI IP (Option C), there would be an IP address conflict preventing the interface from functioning. Identical software versions (Option D) are mandatory because the SSO state synchronization protocol and data structures must be version-compatible between the active and standby controllers. Any mismatch in IOS XE version will prevent SSO formation. License count (Option A) does not need to be identical for SSO. Service port IP addresses (Option E) must be unique per controller, not identical.
Reference: WLSD Study Guide - Catalyst 9800 SSO Prerequisites, Redundancy Management Interface Configuration, High Availability Pair Formation Requirements.
質問 # 71
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
正解：D
解説：
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group's communication plane.
質問 # 72
Users who leave the office with a wireless headset must be able to hand oft the voice call with minimal disruption. The engineer drafted four possible Door plans for AP placement:
* red dots and arrows represent the direction of travel
* blue dots represent the AP placements
Which floor plan provides the requested functionality?
A)
B)
C)
D)
正解：B
解説：
VoWLAN handoff quality is fundamentally determined by the AP placement strategy relative to the direction of user movement. When a user is in motion carrying an active voice call, the roaming event must occur before signal quality degrades below the minimum acceptable VoWLAN threshold (typically -67 dBm for voice, with a minimum SNR of 25 dB). This requires the user to encounter increasing signal strength from a neighboring AP before the current AP ' s signal drops below the threshold. The optimal AP placement follows the principle of overlapping coverage along the predicted path of travel - APs must be positioned so that as a user moves, they progressively enter the coverage zone of the next AP while still within adequate range of the current one. Floor plan B represents the correct design where APs are positioned along the travel path with sufficient cell overlap (typically 15-20%) to ensure seamless 802.11r fast BSS transitions. Incorrect floor plans place APs perpendicular to travel direction, at path endpoints only, or with insufficient overlap zones - all of which create roaming dead zones where the handoff occurs too late, causing voice call disruption.
Reference: WLSD Study Guide - VoWLAN AP Placement, Roaming Design for Moving Users, Cell Overlap and Fast Transition Planning.
質問 # 73
An engineer configured the optimized client roaming on Cisco WLC with an RSSI threshold of -72 dBm.
Clients report frequent disconnections. What must be configured for the AP to guide the client to a better AP?
正解：D
解説：
The scenario presents a critical distinction in where Cisco WLC features are configured. Optimized roaming on Cisco WLC is a radio-level feature that monitors connected client RSSI and, when a client ' s signal falls below the configured threshold (-72 dBm), triggers a disassociation to force the client to reconnect to a stronger AP. However, without a mechanism to guide the client proactively before reaching the threshold, clients that disassociate simply reconnect to whatever AP their device selects, potentially causing the reported frequent disconnections. BSS Transition Management (802.11v) is configured at the SSID level and provides the complementary mechanism: before the client reaches the RSSI threshold, the AP sends a BSS Transition Management Request pointing the client toward a specific target AP with stronger signal. The correct architecture requires: optimized roaming configured at the radio level (triggering disconnection when RSSI falls too low) combined with BSS transition enabled at the SSID level (guiding the client to a better AP before forced disconnection). Options C and D incorrectly reverse the configuration levels for these features.
Disabling coverage hole detection (Option B) addresses a different problem and would not resolve the disconnection issue. Reference: WLSD Study Guide - Optimized Roaming Configuration, BSS Transition Management (802.11v), Client Roaming Architecture on Cisco WLC.
質問 # 74
A customer has a single anchor WLC named Anchor A. Anchor A is in a DMZ and provides guest access.
The customer wants to deploy an additional anchor controller named Anchor B to provide redundancy if Anchor A fails. Which design approach should be taken for the guest WLAN priority on the foreign WLC for each anchor WLC?
正解：D
解説：
In a wireless network design where anchor redundancy is required for guest access, setting different priorities for the anchor controllers ensures deterministic primary and backup behavior. Cisco anchor priority uses a lower numerical value to indicate higher preference - Priority 1 is the highest priority (most preferred) anchor, and Priority 3 is lower priority. Setting Anchor A to priority 1 (Option D) makes it the primary anchor controller - all new guest client sessions will preferentially anchor to Anchor A. Setting Anchor B to priority
3 makes it the standby anchor - guest clients will only be anchored to Anchor B when Anchor A is unavailable. This creates a clear primary/backup relationship with deterministic failover. Setting both anchors to the same priority (Options A and C) would result in load balancing between the two anchors rather than active/standby behavior. Option B incorrectly reverses the priorities, making Anchor B the primary and Anchor A the backup. Reference: WLSD Study Guide - Guest Anchor Redundancy Design, Anchor Priority Configuration, DMZ Anchor WLC Architecture.
質問 # 75
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