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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wireless Site Survey | 25% | - Post-deployment site survey - Predictive site survey - Pre-deployment site survey - Planning tools and network metrics evaluation - Material attenuation and its design effects - Collect design requirements and evaluate constraints - Layer 1 site survey analysis |
| Topic 2: Mobility | 25% | - Optimize client roaming - Validate mobility tunneling - Design mobility groups - Site Tags |
| Topic 3: Wired and Wireless Infrastructure | 30% | - Design radio management - Design high-density wireless networks - Physical infrastructure requirements - Design for data, voice, video, location - Logical infrastructure requirements - Design wireless bridging (mesh) |
| Topic 4: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
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NEW QUESTION # 121
A customer is planning to replace older access points with Cisco 4800 Series Access Points. Unaware of the infrastructure requirements, the client has an engineer investigate the inline power requirement. Which IEEE
802.3 standard complies with the Cisco 4800 Series Access Points?
Answer: A
Explanation:
The Cisco Aironet 4800 Series Access Point is a tri-radio, high-performance access point designed for high- density environments. It draws significantly more power than older dual-radio APs and requires IEEE 802.3bt (also known as PoE++), which provides up to 90W per port at the Power Sourcing Equipment. IEEE 802.3af (Type 1 PoE) delivers only 15.4W and 802.3at (Type 2 PoE+) provides up to 30W - both are insufficient for full functionality of the 4800 series, which has a dedicated third scanning radio that requires the additional power budget provided by 802.3bt. IEEE 802.3ac is a standard related to VLAN tagging and is entirely unrelated to Power over Ethernet. Engineers designing wired infrastructure for Cisco 4800 deployments must ensure switches support 802.3bt Type 3 or Type 4 to guarantee full AP functionality across all three radios simultaneously. Reference: WLSD Study Guide - Wired Infrastructure Design, PoE Standards and Power Budget Planning, Cisco 4800 Series AP Specifications.
NEW QUESTION # 122
Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?
Answer: A
Explanation:
In a high-availability configuration with multiple WLCs in a mobility group, when APs that only have a primary controller configured become orphaned (their primary WLC fails), they will by default join the controller with the lowest percentage of associated APs per license capacity. This load-based selection mechanism ensures a balanced distribution of APs across the remaining controllers in the mobility group. The WLC with the lowest percentage of AP capacity utilized is chosen because it has the most headroom to accept additional APs without becoming overloaded. This prevents a single backup controller from becoming overwhelmed while others remain underutilized. The selection is not based on absolute number of APs (Option D), available free licenses in absolute terms (Option A), or CPU utilization (Option C) - it specifically uses the percentage of license capacity occupied, which normalizes across controllers with different total AP capacities. Reference: WLSD Study Guide - N+1 Redundancy Default Behavior, AP Orphan Failover Logic, WLC Load-Based AP Assignment.
NEW QUESTION # 123
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco
9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
Answer: A
Explanation:
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command ' wireless mobility mac-address < MAC > ' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming. Option A configures the HA interface for SSO synchronization but not for AireOS mobility interoperability. Option B sets a default gateway. Option D enables management gateway failover, unrelated to mobility peer identification. Reference: WLSD Study Guide - IOS XE WLC SSO Configuration, AireOS to 9800 Migration, Mobility Peer MAC Address Management.
NEW QUESTION # 124
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
Answer: C
Explanation:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick- walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP's signal but cannot hear each other -- making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment.
NEW QUESTION # 125
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: B,D
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.
NEW QUESTION # 126
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