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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Logical infrastructure requirements - Design for data, voice, video, location - Design high-density wireless networks - Design wireless bridging (mesh) - Physical infrastructure requirements - Design radio management |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wireless Site Survey | 25% | - Layer 1 site survey analysis - Post-deployment site survey - Predictive site survey - Collect design requirements and evaluate constraints - Material attenuation and its design effects - Planning tools and network metrics evaluation - Pre-deployment site survey |
| Mobility | 25% | - Design mobility groups - Validate mobility tunneling - Optimize client roaming - Site Tags |
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NEW QUESTION # 12
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: C
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 # 13
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: B,E
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. Wider 5 GHz channels (Options C and E - 80 MHz and 40 MHz) would consume multiple channel blocks, dramatically reducing the number of available non-overlapping channels and increasing co-channel interference in dense deployments. For 2.4 GHz operation (Option B), 20 MHz channels are mandatory - there are only three non-overlapping 20 MHz channels (1, 6, 11) in the 2.4 GHz band. Using 40 MHz channels in 2.4 GHz (Option D) eliminates all non- overlapping channel separation, causing massive co-channel interference and is universally contraindicated in enterprise designs. Reference: WLSD Study Guide - Channel Planning, High-Density Design, Frequency Band Selection.
NEW QUESTION # 14
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: D
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 # 15
A university wants to deploy a high density of APs in an area where a high number of users congregate. Which functionality allows the university to optimize the RF settings for APs that operate in different environments or coverage zones?
Answer: C
Explanation:
RF Profiles are a Cisco WLC configuration construct that allows administrators to define a customized set of Radio Resource Management (RRM) parameters and apply them to a subset of APs operating in a specific environment or coverage zone. Within a university high-density deployment -- where a lecture hall, outdoor quad, cafeteria, and library may each require fundamentally different RF settings -- RF Profiles enable differentiation without globally modifying all RRM parameters. An RF Profile can define custom values for: minimum mandatory data rates, maximum transmit power, minimum transmit power, channel width (20/40/80 MHz), RxSOP thresholds, client load balancing parameters, and coverage hole detection sensitivity. This allows the engineer to apply aggressive interference mitigation settings to high-density assembly areas while maintaining full-coverage settings for perimeter zones.
NEW QUESTION # 16
A network engineer must design a new Cisco wireless solution that contains three Cisco 9800-40 WLCs. WLC1 and WLC2 will be combined into one logical unit with SSO and a backup WLC named WLC3 will be joined by using a mobility tunnel. Link redundancy between the WLCs and the switches is required. Which WLCs must the design provide connectivity to the network equipment for LAG to be effective in an SSO failover scenario?
Answer: D
Explanation:
In a Cisco Catalyst 9800 SSO deployment using Link Aggregation Group (LAG) for network interface redundancy, the SSO pair -- WLC1 (active) and WLC2 (standby) -- must both have their physical interfaces connected to the network infrastructure as part of the LAG bundle. LAG on the
9800 in an SSO configuration is implemented as a multi-chassis LAG across both the active and standby controllers. This means both WLC1 and WLC2 contribute physical member links to the port channel, and the connected switches must have LACP or PAgP bundle members from both controllers in the same port channel group. When an SSO failover occurs -- WLC1 fails and WLC2 takes over as active -- the LAG remains operational because WLC2's physical links are already established members of the bundle and continue forwarding traffic without any link renegotiation. If only WLC1 had LAG connectivity and WLC2 had independent links, an SSO failover would cause a LAG topology change requiring re-convergence, introducing downtime.
WLC3 is a separate N+1 backup controller joined via a mobility tunnel -- not part of the SSO pair and its LAG configuration is independent. Reference:
NEW QUESTION # 17
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