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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Validation | - Validation tools and post-deployment testing - Wireless performance troubleshooting methodologies |
| Topic 2: RF Fundamentals and Design Principles | - Antenna types and placement strategies - Channel planning and interference mitigation - RF behavior and propagation |
| Topic 3: High Availability and Performance Optimization | - Load balancing and RF optimization - Redundancy design for controllers and APs |
| Topic 4: Cisco Wireless Architecture | - Mobility groups and roaming design - Controller-based architecture (WLC) - Lightweight Access Point (LAP) deployment models |
| Topic 5: Wireless Security Design | - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies |
| Topic 6: Wireless Site Survey and Requirements Analysis | - Business and technical requirements gathering - Physical environment assessment and constraints - Coverage and capacity planning |
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NEW QUESTION # 118
A customer requires the wireless network to perform real-time analysis to reduce congestion, link usage, and infrastructure upgrades. Which Cisco technology can accomplish this analysis?
Answer: C
Explanation:
Cisco Application Visibility and Control (AVC) is a deep packet inspection and traffic classification framework integrated into the Cisco WLC and AP platform. AVC performs real-time analysis of wireless client traffic, classifying applications based on Layer 4-7 signatures using the NBAR2 (Network Based Application Recognition) engine. This provides the network administrator with granular visibility into exactly which applications are consuming bandwidth -- enabling data-driven decisions about network congestion remediation, link utilization management, and infrastructure investment planning. For example, AVC can reveal that a video streaming application is consuming 60% of available wireless bandwidth during peak hours, informing the decision to implement QoS rate limiting for that application class or upgrade the backhaul infrastructure. AVC also supports control functions through per-application QoS policies, rate limiting, and traffic shaping -- directly addressing congestion reduction.
NEW QUESTION # 119
An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?
Answer: A
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non- routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with. If different virtual IP addresses were used (Option B), clients roaming between controllers would experience DHCP failures during inter-controller roaming because the DHCP server address seen by the client would change. Options A and C relate to DNS hostname configuration, which is useful for AP discovery but does not affect the roaming behavior of client devices. The virtual IP address consistency across all mobility group members is a fundamental requirement for seamless inter-controller roaming. Reference: WLSD Study Guide - Mobility Group Configuration, Virtual IP Address, Inter- Controller Roaming Requirements.
NEW QUESTION # 120
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
Answer: B
Explanation:
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users ร 1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput - this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is therefore: total required throughput divided by throughput per channel = 100 Mbps รท 20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the
5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco ' s high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population. Reference: WLSD Study Guide - High-Density WLAN Capacity Planning, Per-User Throughput Calculation, Channel Planning and Spatial Reuse.
NEW QUESTION # 121
A wireless network consists of two IOS XE controllers installed in a data center, 9100 series APs, and a corporate and a guest WLAN. The customer must have a high availability pair of two Cisco WLCs for the client SSO. Which two design approaches must the engineer take to meet the requirement? (Choose two.)
Answer: C,E
Explanation:
Configuring a high availability SSO pair on Cisco Catalyst 9800 IOS XE WLCs has specific technical prerequisites that must be satisfied for the SSO relationship to form and function correctly. The two critical requirements are: each WLC must have a unique Redundancy Management Interface (RMI) IP address (Option B), and both WLCs must run identical IOS XE software versions (Option D). The Redundancy Management Interface is the dedicated in-band control channel over which the active and standby WLCs exchange state synchronization information, keepalive messages, and configuration updates. Each controller requires its own unique RMI IP address within the same subnet -- the active uses one address and the standby uses another.
NEW QUESTION # 122
A customer has three data centers and wants to deploy 1500 APs with controller redundancy that does not require a dedicated standby controller for each active controller. Which redundancy model should the engineer design?
Answer: C
Explanation:
N+1 redundancy allows a single backup controller to protect multiple active controllers, which is the most cost-effective model when a customer wants resilience across several sites without buying a one-to-one standby for each active WLC. In this model, each AP is configured with a primary, secondary, and optionally tertiary controller name and IP address; if the primary fails, the AP discovers and joins the next configured controller in the list. The trade-off is that APs must re- establish CAPWAP tunnels and clients must re-associate, so failover is not seamless. SSO high availability (Options A and C) delivers stateful AP and client failover but requires a dedicated standby WLC paired one-to-one with each active WLC and, on AireOS platforms, a back-to-back redundancy port connection - which does not meet the customer's requirement of avoiding a dedicated standby per controller. Mobility anchor redundancy addresses guest traffic anchoring, not general AP controller failover.
NEW QUESTION # 123
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