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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mobility | 25% | - Site Tags - Optimize client roaming - Design mobility groups - Validate mobility tunneling |
| Topic 2: Wireless Site Survey | 25% | - Collect design requirements and evaluate constraints - Planning tools and network metrics evaluation - Post-deployment site survey - Layer 1 site survey analysis - Predictive site survey - Material attenuation and its design effects - Pre-deployment site survey |
| Topic 3: WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Topic 4: Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design radio management - Design wireless bridging (mesh) - Physical infrastructure requirements - Logical infrastructure requirements - Design for data, voice, video, location |
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NEW QUESTION # 100
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)
Answer: D
Explanation:
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.
NEW QUESTION # 101
An engineer must reduce roaming delay for wireless medical carts running a real-time application on an 802.1X-secured WLAN. Which feature should be included in the design to eliminate the full reauthentication on each roam?
Answer: A
Explanation:
On an 802.1X/WPA2-Enterprise WLAN, a standard roam requires the client to complete a full EAP exchange with the authentication server plus a four-way handshake, which typically takes hundreds of milliseconds and is enough to break a real-time session. 802.11r Fast Transition solves this by caching the master key material and pre-establishing the key hierarchy so the client can complete the roam with an abbreviated exchange, reducing roam time to well under 50 ms.
This is the only option in the list that eliminates the reauthentication itself. 802.11k assists roaming by providing the client a neighbor report so it does not have to scan every channel to find candidate APs, and 802.11v allows the infrastructure to steer a client toward a better AP - both reduce the time spent deciding where to roam, but neither shortens the authentication exchange once the target AP is chosen. Aironet IE carries Cisco-specific information elements and is unrelated to fast roaming key handling.
NEW QUESTION # 102
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment.
Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
Answer: D,E
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D).
UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic -- both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function.
NEW QUESTION # 103
A wireless engineer is using Ekahau Site Survey to validate that an existing wireless network is operating as expected. A Cisco CleanAir AP is used for Layer 1 survey by using Metageek Chanalyzer only on the current operating channel. Which operating mode is configured for the Cisco CleanAir AP?
Answer: D
Explanation:
When using Metageek Chanalyzer in conjunction with a Cisco CleanAir-capable AP for Layer 1 spectrum analysis, the AP must be configured in SE-Connect mode (Spectrum Expert Connect). SE-Connect mode enables the AP ' s CleanAir radio to operate as a dedicated spectrum analyzer, feeding raw spectrum data to the connected Chanalyzer software for visualization and analysis. In this mode, the AP does not serve any Wi- Fi clients and instead focuses all radio resources on spectrum scanning. Metageek Chanalyzer uses the SE- Connect mode specifically to receive the CleanAir ASIC ' s spectrum analysis data. Local mode (Option A) serves clients normally, only providing periodic CleanAir reports. Sniffer mode (Option B) captures 802.11 frames for protocol analysis and does not provide raw spectrum data to Chanalyzer. Monitor mode (Option C) performs WIDS scanning and RRM measurements but does not support the direct Chanalyzer integration. SE- Connect is the specific mode that enables external spectrum analysis software to use the CleanAir ASIC ' s spectrum data in real time. Reference: WLSD Study Guide - Cisco CleanAir Technology, AP Operating Modes, SE-Connect Mode for Spectrum Analysis.
NEW QUESTION # 104
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?
Answer: D
Explanation:
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. RF Protocol (Option A) controls radio parameters. AP Groups (Option B) control SSID and VLAN assignments per AP cluster. AAA Override (Option D) allows RADIUS servers to assign per-user VLANs, which requires authentication - but these SSIDs use open authentication. Reference: WLSD Study Guide - N+1 High Availability Design, VLAN Select Feature, Consistent Client VLAN Assignment Across Controllers.
NEW QUESTION # 105
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