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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN High Availability and Security Design | 20% | - Security architecture design
- High availability design
|
| Topic 2: Wireless Infrastructure Design | 30% | - Wired-wireless integration design
|
| Topic 3: Mobility Design | 25% | - Mobility architecture models
- Roaming optimization
|
| Topic 4: Wireless Site Survey | 25% | - RF propagation and attenuation analysis - Layer 1 site survey execution and analysis - Design requirements collection and constraint evaluation
|
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NEW QUESTION # 67
A wireless engineer is using Ekahau site survey to validate that an existing wireless network is operating as expected. Which type of survey should be used to identify end-to-end network performance?
Answer: C
Explanation:
An active ping survey is used to validate network performance by sending and receiving data packets to measure end-to-end network performance, including latency, packet loss, and throughput. Ekahau site survey tools can perform active ping surveys to test the connectivity and performance of the wireless network while the surveyor walks the floor plan, producing a geographically correlated map of network performance metrics.
This differs fundamentally from passive surveys, which only measure signal strength from beacons. A GPS- assisted survey (Option A) is used for large outdoor areas to automate location tracking. Spectrum analysis (Option B) identifies Layer 1 RF conditions but does not measure network performance. A passive survey (Option C) measures RSSI and SNR but does not test actual data connectivity or throughput. Active ping is the correct tool for validating that the network delivers the expected end-to-end service levels. Reference:
WLSD Study Guide - Ekahau Survey Types, Active Survey Methodology, Post-Deployment Validation.
NEW QUESTION # 68
A network engineer must design a new wireless solution for a company, but the budget can only stretch to include a single Cisco 9800-40 WLC. The company requires high availability between the WLC and the core switch in the event of a cable failure. The WLC must dynamically manage port redundancy and perform load balancing between APs transparently. Which design approach must the engineer take to meet the requirements?
Answer: D
Explanation:
Link Aggregation Group (LAG) is the correct design approach for a single Cisco 9800-40 WLC that requires high availability between the WLC and the core switch in the event of a cable failure. LAG combines multiple physical ports on the WLC into a single logical channel, providing both redundancy (traffic automatically redistributes across remaining links when one fails) and load balancing (traffic is distributed across all active links). Importantly, LAG operates transparently to AP management - APs see a single logical uplink regardless of which physical port their traffic traverses. With a single WLC, Multi-LAG (Option B) is not applicable - Multi-LAG is a feature of the Catalyst 9800 that allows multiple separate LAG bundles for different network connections, typically used with SSO pairs. LACP (Option C) is the protocol used to negotiate LAG member links - it is the mechanism within LAG, not an independent design approach. PAgP (Option D) is a Cisco proprietary alternative to LACP for port aggregation but the question asks for the design approach, which is LAG. Reference: WLSD Study Guide - Catalyst 9800 LAG Design, Port Redundancy and Load Balancing, Single-Controller High Availability.
NEW QUESTION # 69
During a client roaming event, which device is responsible for communicating the new Layer 2 EID mapping of a wireless supplicant to the fabric domain?
Answer: C
Explanation:
During a client roaming event in a Cisco SD-Access fabric deployment, the Wireless LAN Controller (WLC) is responsible for communicating the new Layer 2 Endpoint ID (EID) mapping of a wireless supplicant to the fabric domain. In the SD-Access architecture, the WLC acts as a mobility orchestrator and serves as the interface between the wireless domain and the wired fabric. When a client roams from one AP to another, the WLC detects the roaming event and updates the fabric control plane with the new EID-to-RLOC (Routing Locator) mapping by notifying the fabric control plane node (CP). This ensures that the fabric knows the client's new location and can route traffic correctly without interruption. The Border Node (BN) handles traffic between the fabric and external networks. CP1 and CP2 are control plane nodes that maintain the mapping database but receive EID update notifications from the WLC -- they do not initiate the EID mapping communication themselves.
NEW QUESTION # 70
A wireless engineer must design a WLAN for a university that requires outdoor Wi-Fi access. Which obstruction has the greatest effect on wireless signal propagation?
Answer: D
Explanation:
In outdoor wireless deployments, foliage - particularly dense trees - represents the most significant and variable RF obstruction that engineers must account for during site survey and design. Trees are problematic for multiple compounding reasons: the high water content of living tissue causes signal absorption consistent with the principle that water is an effective absorber of 2.4 GHz and 5 GHz RF energy; the irregular branching structure causes multi-path scattering; and foliage density changes seasonally, meaning signal propagation characteristics measured during winter may differ substantially from summer readings when leaves are fully developed. A fully leafed deciduous tree can attenuate a 5 GHz signal by 6-15 dB depending on density and depth. Wind (Option A) causes only momentary mechanical movement of foliage and is not an obstruction itself. Rain (Option B) causes some absorption at higher frequencies but its effect at 2.4 GHz and
5 GHz in typical conditions is marginal compared to foliage. Poles (Option D) are thin structures with minimal RF impact. Outdoor surveys for university campuses must specifically account for tree locations, canopy density, and seasonal variation. Reference: WLSD Study Guide - Outdoor Wireless Design, Environmental RF Attenuation Factors, Outdoor Site Survey Considerations.
NEW QUESTION # 71
What happens to an AP when a flex profile name is changed in a site tag?
Answer: A
Explanation:
On the Cisco Catalyst 9800 IOS XE WLC platform, the tag-based configuration model uses site tags to associate APs with specific profiles including a flex profile and an AP join profile. The site tag is a fundamental binding element -- when any component of a site tag is modified, including renaming the flex profile associated with that tag, the WLC treats this as a material configuration change requiring the AP to re-evaluate its operational parameters. Specifically, the AP must disconnect its existing DTLS (Datagram Transport Layer Security) control plane tunnel to the WLC and re-establish it. This DTLS session disconnect and rejoin cycle is equivalent to a full AP rejoin: CAPWAP discovery, DTLS handshake, join request, configuration download, and image verification. Client service is interrupted on the affected AP during this process.
NEW QUESTION # 72
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