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| Section | Weight | Objectives |
|---|---|---|
| Mobility | 25% | - Optimize client roaming - Validate mobility tunneling - Design mobility groups - Site Tags |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Design wireless bridging (mesh) - Design radio management - Logical infrastructure requirements |
| Wireless Site Survey | 25% | - Collect design requirements and evaluate constraints - Pre-deployment site survey - Planning tools and network metrics evaluation - Predictive site survey - Layer 1 site survey analysis - Post-deployment site survey - Material attenuation and its design effects |
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NEW QUESTION # 79
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,E
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 # 80
An engineer is conducting a Layer 2 site survey. Which type of client must the engineer match to the survey?
Answer: D
Explanation:
When conducting a Layer 2 site survey, it is recommended to match the survey to the worst client available.
This ensures that the wireless network is designed to provide adequate coverage and performance even for clients with the poorest RF capabilities, thereby providing a consistent user experience for all devices. The worst client typically has fewer antennas, lower receiver sensitivity, and less sophisticated chipsets. By designing to its limitations, the engineer guarantees that every device in the environment meets the minimum performance threshold. Using the best client (Option A) or an average client (Option C) would result in coverage gaps for less capable devices. A phone client (Option B) may have unique characteristics but is not a universally applicable standard for general survey purposes. Reference: WLSD Study Guide - Site Survey Methodology, Client Selection for Survey, Layer 2 Pre-Deployment Survey.
NEW QUESTION # 81
An engineer is designing an outdoor mesh network for a container yard. Which two design rules apply to the mesh deployment? (Choose two.)
Answer: B,E
Explanation:
In a Cisco mesh deployment, the Root AP (RAP) has a wired connection to the network and the Mesh APs (MAPs) connect back to it over a wireless backhaul, typically using the 5 GHz radio.
Cisco recommends limiting the mesh to no more than four hops from RAP to the furthest MAP (Option A); while more hops are technically possible, each additional hop increases latency, jitter, and convergence time after a link failure. Backhaul throughput is roughly halved with each hop (Option C) because a MAP that relays traffic must both receive and retransmit each frame on the same half-duplex radio channel, consuming airtime twice. This compounds down the chain, so an eight-hop design delivers negligible usable throughput at the far end. MAPs by definition have no wired uplink, and RAPs and their associated MAPs must share the same bridge group name to form the mesh tree.
NEW QUESTION # 82
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
Answer: D
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non-Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions. Wireless intrusion prevention (Option B) detects rogue APs and 802.11 attacks but not Layer 1 RF noise. Wireshark (Option C) is a packet capture tool for Layer 2-7 analysis and cannot detect non-Wi-Fi RF energy. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Post- Deployment Survey, Non-Wi-Fi Interference Identification.
NEW QUESTION # 83
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 # 84
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