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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mobility | 25% | - Site Tags - Design mobility groups - Validate mobility tunneling - Optimize client roaming |
| Topic 2: WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Topic 3: Wired and Wireless Infrastructure | 30% | - Design for data, voice, video, location - Design high-density wireless networks - Physical infrastructure requirements - Design wireless bridging (mesh) - Design radio management - Logical infrastructure requirements |
| Topic 4: Wireless Site Survey | 25% | - Pre-deployment site survey - Material attenuation and its design effects - Layer 1 site survey analysis - Planning tools and network metrics evaluation - Predictive site survey - Post-deployment site survey - Collect design requirements and evaluate constraints |
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NEW QUESTION # 110
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: C
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 # 111
An engineer is designing the wired infrastructure to support VoWLAN. Which QoS design should be applied to the switch ports connecting the APs?
Answer: A
Explanation:
In a centrally switched CAPWAP deployment, client traffic is encapsulated between the AP and the controller, and the AP copies the QoS marking from the inner client packet into the DSCP field of the outer CAPWAP header. If the switch port connecting the AP does not trust DSCP, the switch rewrites those markings to zero at ingress and every voice packet loses its priority treatment for the remainder of its journey across the wired network. Trusting DSCP on the AP- facing port preserves the marking end to end and allows the campus queueing policies to place voice into the priority queue. Trusting CoS is ineffective here because the AP-to-switch link is typically an access port carrying untagged frames with no 802.1p field to trust. Leaving the port untrusted or policing it aggressively strips or drops the very traffic the design is intended to protect, and omitting trust configuration on a switch that defaults to untrusted produces the same failure.
NEW QUESTION # 112
An engineer is designing coverage for a distribution warehouse with 12 m ceilings and metal racking that reaches 10 m. Which antenna design approach should be used?
Answer: B
Explanation:
In a high-bay warehouse, an omnidirectional antenna mounted at the ceiling radiates most of its energy horizontally across the top of the racking, where no clients exist, while the aisles below sit in the antenna's null. Metal racking and dense inventory further block any signal that does propagate downward. High-gain directional antennas - typically patch or narrow-beam downtilt models - concentrate energy into a defined pattern that can be aimed down the aisle or vertically into the picking area, delivering usable signal to scanners and forklift terminals at floor level while limiting spill into adjacent aisles. That containment also improves channel reuse in a space that is otherwise one large open volume. Mounting APs facing upward or at floor level places the antenna where it will be blocked or physically damaged, and low-gain omnidirectional antennas lack the pattern control this environment demands.
NEW QUESTION # 113
An enterprise network is deploying two Cisco Catalyst 9800 WLCs in a data center to ensure uninterrupted wireless services for a campus with thousands of users. The IT management requests a design that enables seamless failover without client reauthentication or loss of connectivity if one controller fails. Ease of configuration and ongoing management are high priorities. The controllers will be connected via a high-speed LAN segment, and both must support full active-passive redundancy for all managed APs. Which design approach meets the requirements?
Answer: A
Explanation:
Cisco Stateful Switchover (SSO) on the Catalyst 9800 platform is the definitive high availability solution when requirements specify zero client reauthentication during failover, active-passive redundancy, and ease of management. With SSO enabled, the active and standby 9800 WLCs maintain a synchronized state database via a dedicated redundancy link - this includes all client association state, authentication credentials, AP join information, and WLAN configurations. When the active controller fails, the standby assumes control instantaneously with no CAPWAP session teardown and no 802.1X reauthentication required. The Redundancy Management Interface (RMI) provides a dedicated in-band keepalive and state synchronization path. N+1 redundancy (Option D) requires APs to rejoin a new controller and clients to reauthenticate, failing the seamless requirement. Manual configuration synchronization (Options A and C) is operationally complex and does not guarantee stateful failover. VRRP provides gateway redundancy at Layer 3 but does not address CAPWAP session continuity. Reference: WLSD Study Guide - Catalyst 9800 High Availability, SSO Architecture, Redundancy Management Interface Configuration.
NEW QUESTION # 114
An engineer is designing a wireless network in a historic building that has large rooms and ornate wall coverings. Which approach must be considered first when placing access points?
Answer: C
Explanation:
When designing a wireless network for any environment, including a historic building with ornate wall coverings and aesthetic constraints, RF coverage must always be considered first when placing access points.
RF coverage is the fundamental requirement - without adequate signal strength throughout the space, no other design objective can be met. The engineer must first determine AP locations that provide the required signal strength and coverage to all areas before addressing aesthetics, overlap calculations, or interference mitigation. In a historic building specifically, the ornate wall coverings and dense construction materials may cause unexpected signal attenuation, making it even more important to model RF coverage before committing to AP positions. Once RF coverage requirements are established, aesthetic concerns (Option A) can guide the choice of AP form factor, enclosures, or cabling routes. Cell overlap (Option C) is derived from coverage calculations. RF interference (Option D) analysis follows after RF coverage baseline is established.
Reference: WLSD Study Guide - Site Survey Methodology, AP Placement Priority, Special Environment Wireless Design.
NEW QUESTION # 115
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