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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Logical infrastructure requirements - Design radio management - Design for data, voice, video, location - Physical infrastructure requirements - Design wireless bridging (mesh) |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Mobility | 25% | - Site Tags - Design mobility groups - Optimize client roaming - Validate mobility tunneling |
| Wireless Site Survey | 25% | - Pre-deployment site survey - Layer 1 site survey analysis - Predictive site survey - Planning tools and network metrics evaluation - Post-deployment site survey - Material attenuation and its design effects - Collect design requirements and evaluate constraints |
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104. Frage
Refer to the exhibit. A network engineer is designing a high availability SSO on a Cisco Catalyst
9800- 40 WLC with multi-LAG network redundancy on two Catalyst 9300 switches. The LAG requirements are: ?Each LAG must be connected to a single switch. ?Different VLANs must be assigned to different LAGs. ?The controller must learn the identity of partners that can support LAG capabilities in each port. ?When any active LAG ports fail, a standby LAG port must provide redundancy. Which protocol must be used for the port channel on the interface to meet the design requirements?
Antwort: A
Begründung:
The design requirements specify a multi-LAG configuration where each LAG connects to a single switch, different VLANs are assigned to different LAGs, the controller must dynamically learn partner LAG capabilities per port, and standby ports provide redundancy upon active port failure.
These requirements collectively point to IEEE 802.3ad LACP (Link Aggregation Control Protocol) as the correct protocol. LACP is the industry-standard IEEE protocol that enables dynamic negotiation of LAG membership between endpoints -- the WLC and each Catalyst 9300 switch exchange LACP PDUs (LACPDUs) to discover port capabilities, negotiate bundle membership, and monitor link status. LACP supports active and passive port states where active ports initiate negotiation and passive ports respond, and it provides the standby port mechanism through its hot-standby capability for link redundancy within the bundle. The requirement to 'learn the identity of partners that can support LAG capabilities' is the defining characteristic of LACP's standardized PDU exchange mechanism.
105. Frage
An engineer is performing an AP-on-a-stick survey and finds that the 5 GHz channel overlap is too high when an appropriate number of APs are used for the density requirements. Which two actions during the survey reduce channel overlap? (Choose two.)
Antwort: C,E
Begründung:
Raising the minimum data rate to 24 Mbps reduces the effective coverage range of each AP because clients at the cell edge operating at low data rates are effectively excluded from the cell.
This shrinks cell size, reducing channel overlap between neighboring APs on the same channel.
Using directional antennas limits the coverage area of some APs by focusing RF energy in specific directions rather than radiating omnidirectionally, which directly reduces the lateral overlap between adjacent APs.
106. Frage
A small customer has a legacy autonomous mode Wi-Fi deployment that provides a low-density and low-capacity service. The customer wants to update and replace this deployment with the latest Wi- Fi technology but has a fixed budget that will pay only to replace the APs. Which architectural controller deployment model suits this requirement?
Antwort: A
Begründung:
Cisco's Embedded Wireless Controller (EWC) architecture is the ideal solution for small deployments with strict budget constraints where only the access points can be replaced. EWC is a controller function that runs directly within the Cisco Catalyst 9100 Series access point itself -- eliminating the need for a dedicated physical or virtual WLC appliance. The APs serve dual roles as both the wireless radio infrastructure and the controller platform.
107. Frage
An engineer is performing a passive survey report. The coverage heat map shows the entire site with all signal levels. To see only the desired coverage, which action must the engineer take?
Antwort: A
Begründung:
To focus the coverage heat map on the desired coverage threshold, the engineer should use the RSSI slider to set the heat map to the desired cutoff filter. This action adjusts the display to show only the signal levels that meet or exceed the specified RSSI value, effectively filtering out weaker signals and highlighting areas with sufficient coverage. In Ekahau and similar survey tools, the RSSI slider provides a dynamic way to set minimum signal thresholds, allowing the engineer to quickly validate whether coverage meets design targets such as -67 dBm for voice or -70 dBm for data.
108. Frage
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?
Antwort: D
Begründung:
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.
109. Frage
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