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| Section | Objectives |
|---|---|
| High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Cisco Wireless Architecture | - Controller-based architecture (WLC) - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models |
| RF Fundamentals and Design Principles | - RF behavior and propagation - Channel planning and interference mitigation - Antenna types and placement strategies |
| Wireless Site Survey and Requirements Analysis | - Physical environment assessment and constraints - Business and technical requirements gathering - Coverage and capacity planning |
| Wireless Security Design | - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design - Guest access and segmentation strategies |
| Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
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NEW QUESTION # 92
A wireless engineer is getting ready to perform a predictive site survey. The new network needs to support data and voice over wireless. Which two Cisco recommendations should be considered for the design? (Choose two.)
Answer: C,D
Explanation:
For a network supporting both data and voice over wireless, two key Cisco design recommendations apply. First, the 5 GHz radio band is recommended for voice over wireless due to its wider channel bandwidths, allowing for higher data rates and better quality of service for latency-sensitive applications. 40 MHz channels in the 5 GHz band provide significantly higher throughput than 20 MHz channels in 2.4 GHz, making Option B correct for the bandwidth reason stated. Second, setting the cell boundary to -67 dBm ensures sufficient signal strength for reliable voice communication at the cell edge, which is the Cisco standard threshold for VoWLAN coverage.
NEW QUESTION # 93
A customer has three data centers and wants to deploy 1500 APs with controller redundancy that does not require a dedicated standby controller for each active controller. Which redundancy model should the engineer design?
Answer: B
Explanation:
N+1 redundancy allows a single backup controller to protect multiple active controllers, which is the most cost-effective model when a customer wants resilience across several sites without buying a one-to-one standby for each active WLC. In this model, each AP is configured with a primary, secondary, and optionally tertiary controller name and IP address; if the primary fails, the AP discovers and joins the next configured controller in the list. The trade-off is that APs must re- establish CAPWAP tunnels and clients must re-associate, so failover is not seamless. SSO high availability (Options A and C) delivers stateful AP and client failover but requires a dedicated standby WLC paired one-to-one with each active WLC and, on AireOS platforms, a back-to-back redundancy port connection - which does not meet the customer's requirement of avoiding a dedicated standby per controller. Mobility anchor redundancy addresses guest traffic anchoring, not general AP controller failover.
NEW QUESTION # 94
A network engineer is designing a new wireless network. The network must include these requirements: ?optimized performance ?avoid interference ?availability in high-density areas ?roaming Which two approaches must be taken? (Choose two.)
Answer: C,D
Explanation:
The design requirements -- optimized performance, interference avoidance, high-density support, and roaming capability -- collectively point to a dual-band strategy using narrow channel widths.
For 5 GHz operation (Option A), 20 MHz channels are the correct choice for high-density and campus- scale deployments. The 5 GHz band has significantly more non-overlapping channels compared to 2.4 GHz (up to 24 non-overlapping 20 MHz channels in UNII-1, UNII-2, and UNII-3), enabling a robust channel reuse plan with minimal co-channel interference and excellent roaming cell separation.
NEW QUESTION # 95
A customer is building a new warehouse facility that has only its foundation and perimeter walls built. The building will be complete in the next eight months. The customer needs a detailed bill of materials and costs for a wireless network that must support RF scanners throughout the warehouse. How should the survey be performed?
Answer: A
Explanation:
A predictive survey (also called a virtual or model-based survey) is the appropriate and only feasible methodology for a facility that does not yet physically exist in its complete form. Since the warehouse has only its foundation and perimeter walls, it is impossible to conduct any form of physical (active or passive) survey of the complete environment. A predictive survey uses architectural floor plans imported into a tool such as Ekahau Site Survey, where the engineer defines attenuation areas representing planned materials and structures: concrete block walls, steel shelving racks, metallic surfaces, and other warehouse-specific obstructions. The software models RF propagation through these defined attenuation values, enabling accurate AP placement planning, antenna selection, and channel planning without physical access to the complete facility. The output is a validated bill of materials with AP counts, models, and associated infrastructure requirements. Passive surveys (Options A and C) require physical APs transmitting RF signals to collect measurement data - impossible in an incomplete building. A hybrid approach mixing passive survey with predictive modeling introduces measurement errors from the incomplete physical state. Reference: WLSD Study Guide - Survey Types, Predictive Survey Methodology, Pre-Deployment Planning for New Construction.
NEW QUESTION # 96
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: C
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. Setting matching MTUs (Option A) does not prevent fragmentation if the effective tunnel MTU is lower than the client segment size. Increasing the MTU (Option B) is often constrained by physical infrastructure. Setting the DF bit (Option D) would cause packets to be dropped rather than fragmented.
Reference: WLSD Study Guide - Anchored WLAN Design, CAPWAP Mobility Tunnel MTU, TCP MSS Clamping.
NEW QUESTION # 97
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