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| Section | Weight | Objectives |
|---|---|---|
| Wireless Site Survey | 25% | - Layer 1 site survey analysis - Post-deployment site survey - Pre-deployment site survey - Material attenuation and its design effects - Planning tools and network metrics evaluation - Collect design requirements and evaluate constraints - Predictive site survey |
| 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 |
| Mobility | 25% | - Site Tags - Optimize client roaming - Validate mobility tunneling - Design mobility groups |
| WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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NEW QUESTION # 55
An engineer is designing a wireless network for a small airport and completes the initial walkthrough phase of the facility. Which step of the WLAN site survey should the engineer perform next?
Answer: A
Explanation:
The Cisco WLAN site survey methodology follows a structured, sequential process. The initial walkthrough
- sometimes called the discovery or orientation phase - is the first step, during which the engineer physically tours the facility to understand its physical characteristics: building materials, structural layout, potential AP mounting locations, wiring closet positions, and environmental factors. After completing the initial walkthrough, the next logical phase is the predeployment survey (also referred to as a pre-deployment or predictive survey). The predeployment survey uses the information gathered during the walkthrough to create a detailed design plan - either through a manual AP placement plan or a predictive survey tool such as Ekahau, where floor plans are annotated with materials and attenuation values and APs are virtually placed to model coverage. The predeployment survey output is the design document that drives the actual physical installation. A post-deployment survey (Option A) validates coverage after installation - it cannot precede deployment. Active and passive surveys (Options B and D) are physical measurement techniques conducted either pre-deployment (with temporary APs) or post-deployment (with installed APs) - they do not logically follow immediately after a walkthrough before any design work is done. Reference: WLSD Study Guide - WLAN Site Survey Process, Predeployment Survey Phase, Airport Wireless Design Considerations.
NEW QUESTION # 56
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco
9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
Answer: A
Explanation:
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command ' wireless mobility mac-address < MAC > ' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming. Option A configures the HA interface for SSO synchronization but not for AireOS mobility interoperability. Option B sets a default gateway. Option D enables management gateway failover, unrelated to mobility peer identification. Reference: WLSD Study Guide - IOS XE WLC SSO Configuration, AireOS to 9800 Migration, Mobility Peer MAC Address Management.
NEW QUESTION # 57
Which strategies must the engineer use for the antenna deployment model in a warehouse?
Answer: A
Explanation:
Warehouse wireless deployments present unique RF engineering challenges: extremely high ceilings (often
25-45 feet), dense metallic shelving systems that create specular reflections and RF shadows, narrow aisles between rack systems, and the need to cover linear travel paths for RF scanner devices. The recommended Cisco antenna strategy for warehouses is wall-mounted patch (directional) antennas. Patch antennas provide a forward-facing radiation pattern that can be aimed precisely down warehouse aisles, delivering concentrated RF energy where RF scanners actually operate - in the aisles between shelving - rather than dispersing energy into metallic shelving structures. Wall mounting at intermediate height (typically 10-15 feet on aisle- end walls) places the antenna at a height that aligns the main lobe with the working zone of handheld scanners. Ceiling-mounted omnidirectional antennas (Options A and C) at warehouse ceiling height suffer from excessive path loss to floor-level devices and metal shelving obstructions. Low-gain wall-mounted omnidirectional antennas (Option B) lack the directivity needed to focus energy down specific aisles.
Reference: WLSD Study Guide - Warehouse Wireless Design, Antenna Selection and Placement, Industrial RF Environment Considerations.
NEW QUESTION # 58
A consultant must design a WLAN for a large campus with high AP density, 50-100 clients per cell, 5 Mbps throughput per client minimum, 5 GHz and 2.4 GHz coverage at -67 dBm, and no
802.11b clients. Which two WLAN design approaches meet the requirements? (Choose two.)
Answer: A,D
Explanation:
Designing for 50-100 clients per cell with 5 Mbps minimum throughput and no 802.11b clients requires two critical optimizations. First, setting minimum mandatory data rates to 12-18 Mbps (Option A) removes legacy lower data rates from the AP's supported rate set. When 1, 2, 5.5, and
11 Mbps rates are disabled and 12 Mbps becomes the minimum mandatory rate, clients that cannot achieve at least 12 Mbps are rejected from the cell, maintaining throughput standards.
Without this, a single 802.11b client operating at 1 Mbps can consume an inordinate share of airtime and reduce throughput for all other clients below the required minimum. Second, Flexible Radio Assignment (FRA) for 2.4 GHz reduction (Option D) is critical in high-density environments.
FRA allows the WLC to dynamically reassign some 2.4 GHz radios to 5 GHz operation or monitor mode, reducing 2.4 GHz cell size and interference while increasing 5 GHz capacity.
NEW QUESTION # 59
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs. To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
Answer: B
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment). This tunneling adds encapsulation overhead -- CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor.
Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping -- reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead.
NEW QUESTION # 60
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