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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 2: Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Business and technical requirements gathering - Physical environment assessment and constraints |
| Topic 3: RF Fundamentals and Design Principles | - Channel planning and interference mitigation - RF behavior and propagation - Antenna types and placement strategies |
| Topic 4: High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Topic 5: Wireless Security Design | - Guest access and segmentation strategies - 802.1X authentication and RADIUS integration - WPA2/WPA3 enterprise security design |
| Topic 6: Cisco Wireless Architecture | - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) - Mobility groups and roaming design |
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NEW QUESTION # 68
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.
NEW QUESTION # 69
An engineer is performing a Layer 1 passive wireless site survey utilizing a channel analyzer software in the 2.4 GHz spectrum. Which chart indicates the ratio of interference present during the duration of the capture?
Answer: B
Explanation:
In a Layer 1 passive wireless site survey using a channel analyzer tool (such as Metageek Chanalyzer or Cisco Spectrum Expert) in the 2.4 GHz spectrum, the chart that indicates the ratio of interference present during the capture duration is the Duty Cycle chart. The duty cycle chart displays the percentage of time that detected energy -- including both Wi-Fi and non-Wi-Fi signals
-- is present on each channel. A high duty cycle on a channel indicates that the channel is occupied by transmissions for a significant portion of time, reducing available airtime for Wi-Fi clients. This chart directly communicates the ratio of interference because it shows what fraction of the observation period had detectable RF energy above the noise floor. Signal strength charts show amplitude (how strong), while duty cycle charts show temporal occupancy (how often) -- the latter is the correct metric for quantifying interference ratio.
NEW QUESTION # 70
A network engineer is designing a new wireless network for a campus. The network must include optimized performance, avoid interference, availability in high-density areas, and roaming. Which two approaches must be taken? (Choose two.)
Answer: C,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 a significantly greater number of 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. 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 # 71
A customer has a single anchor WLC named Anchor A.
Anchor A is in a DMZ and provides guest access. The customer wants to deploy an additional anchor controller named Anchor B to provide redundancy if Anchor A fails. Which design approach should be taken for the guest WLAN priority on the foreign WLC for each anchor WLC?
Answer: A
Explanation:
In a wireless network design where anchor redundancy is required for guest access, setting different priorities for the anchor controllers ensures deterministic primary and backup behavior.
Cisco anchor priority uses a lower numerical value to indicate higher preference -- Priority 1 is the highest priority (most preferred) anchor, and Priority 3 is lower priority.
Setting Anchor A to priority 1 (Option D) makes it the primary anchor controller -- all new guest client sessions will preferentially anchor to Anchor A.
Setting Anchor B to priority 3 makes it the standby anchor -- guest clients will only be anchored to Anchor B when Anchor A is unavailable. This creates a clear primary/backup relationship with deterministic failover.
NEW QUESTION # 72
After deployment, a customer requires proof that the installed WLAN meets the agreed coverage specification. Which survey type should the engineer perform?
Answer: A
Explanation:
A post-deployment validation survey is conducted after the APs are permanently mounted and configured with their production channel and power settings, and it involves physically walking the space with a survey tool to measure actual RSSI, SNR, noise floor, channel overlap, data rates, and roaming behavior against the agreed design specification. Only this method produces evidence of what the deployed network delivers in the real environment, including the effects of furniture, inventory, and construction that no model fully predicts. A predictive survey is a design- phase estimate and proves nothing about the installed system. A spectrum-only survey characterizes interference sources but does not measure coverage. An AP-on-a-stick survey is a pre-deployment technique used to empirically determine AP placement and quantity by temporarily positioning an AP and measuring propagation - valuable earlier in the process, but it is not a validation of the finished installation.
NEW QUESTION # 73
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