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| Section | Weight | Objectives |
|---|---|---|
| Wired and Wireless Infrastructure | 30% | - Design high-density wireless networks - Design wireless bridging (mesh) - Design radio management - Logical infrastructure requirements - Design for data, voice, video, location - Physical infrastructure requirements |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wireless Site Survey | 25% | - Layer 1 site survey analysis - Post-deployment site survey - Pre-deployment site survey - Predictive site survey - Planning tools and network metrics evaluation - Collect design requirements and evaluate constraints - Material attenuation and its design effects |
| Mobility | 25% | - Design mobility groups - Validate mobility tunneling - Site Tags - Optimize client roaming |
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NEW QUESTION # 22
An engineer is upgrading the legacy APs to 802.11ac Wave 2 capable APs. The existing gigabit uplinked switches provide 802.3at. Which switch limitation is a concern?
Answer: C
Explanation:
The primary concern when upgrading to 802.11ac Wave 2 capable APs with existing switches that only provide IEEE 802.3at (PoE+, 30W maximum) is the output power limitation. 802.11ac Wave 2 APs, particularly Cisco ' s 3800 and 4800 series, can require significantly more power than 30W to operate all radios and capabilities at full capacity. The Wave 2 standard introduced features such as Multi-User MIMO (MU-MIMO), beamforming, and additional spatial streams, all of which increase power consumption. When an AP doesn ' t receive sufficient power, it may reduce transmit power, disable radios, or reduce the number of spatial streams - directly degrading wireless performance. Interface throughput (Option A) may also be a concern with multi-gigabit capable APs, but the question specifically asks about the limitation introduced by
802.3at, which is directly a power delivery constraint. Collision domains (Option C) and high availability (Option B) are unrelated to the PoE standard. Reference: WLSD Study Guide - PoE Upgrade Planning,
802.11ac Wave 2 Infrastructure Requirements, Switch Power Budget Considerations.
NEW QUESTION # 23
Users who leave the office with a wireless headset must be able to hand oft the voice call with minimal disruption. The engineer drafted four possible Door plans for AP placement:
- red dots and arrows represent the direction of travel
- blue dots represent the AP placements
Which floor plan provides the requested functionality?
Answer: D
Explanation:
VoWLAN handoff quality is fundamentally determined by the AP placement strategy relative to the direction of user movement. When a user is in motion carrying an active voice call, the roaming event must occur before signal quality degrades below the minimum acceptable VoWLAN threshold (typically -67 dBm for voice, with a minimum SNR of 25 dB). This requires the user to encounter increasing signal strength from a neighboring AP before the current AP's signal drops below the threshold. The optimal AP placement follows the principle of overlapping coverage along the predicted path of travel -- APs must be positioned so that as a user moves, they progressively enter the coverage zone of the next AP while still within adequate range of the current one. Floor plan B represents the correct design where APs are positioned along the travel path with sufficient cell overlap (typically 15-20%) to ensure seamless 802.11r fast BSS transitions. Incorrect floor plans place APs perpendicular to travel direction, at path endpoints only, or with insufficient overlap zones -- all of which create roaming dead zones where the handoff occurs too late, causing voice call disruption.
NEW QUESTION # 24
A customer has a single anchor WLC named Anchor A.
Anchor A is in a DMZ and provides guest access. The customer wants to deploy an additional anchor controller named Anchor B to provide redundancy if Anchor A fails. Which design approach should be taken for the guest WLAN priority on the foreign WLC for each anchor WLC?
Answer: A
Explanation:
In a wireless network design where anchor redundancy is required for guest access, setting different priorities for the anchor controllers ensures deterministic primary and backup behavior.
Cisco anchor priority uses a lower numerical value to indicate higher preference -- Priority 1 is the highest priority (most preferred) anchor, and Priority 3 is lower priority.
Setting Anchor A to priority 1 (Option D) makes it the primary anchor controller -- all new guest client sessions will preferentially anchor to Anchor A.
Setting Anchor B to priority 3 makes it the standby anchor -- guest clients will only be anchored to Anchor B when Anchor A is unavailable. This creates a clear primary/backup relationship with deterministic failover.
NEW QUESTION # 25
A customer wants to provide wireless coverage in a parking lot outside of a building. An engineer determines that three APs are required. The APs can be mounted on the light poles in the parking lot because there are cable routes already in place for these locations. The closest wiring closet is approximately 200 meters away. Which setup powers and connects the APs back to the customer network?
Answer: D
Explanation:
This question hinges on a fundamental network engineering constraint: the maximum transmission distance of copper Ethernet cabling. IEEE 802.3 standards specify a maximum segment length of 100 meters (328 feet) for all standard PoE and Ethernet over Category 5e, 6, or 6A UTP copper cabling. The parking lot light poles are approximately 200 meters from the closest wiring closet -- more than double the maximum copper distance. This immediately eliminates Options A and D, which specify Category 6 UTP cabling: at 200 meters, UTP copper cannot reliably carry Ethernet at any supported speed, and PoE cannot be delivered over this distance regardless of standard. The correct solution is fiber optic connectivity between the wiring closet and the parking lot, combined with a local AC/DC power module at each pole location.
Fiber optic cabling supports single-mode runs of kilometers and multi-mode runs of hundreds of meters at Gigabit speeds -- easily spanning 200 meters. At the AP mounting location on the light pole, an AC/DC power module (powered from the pole's existing electrical supply) converts AC power to the DC power the AP requires. Option B (fiber with 802.3af) is incorrect because PoE cannot be delivered over fiber -- 802.3af requires copper cabling for simultaneous power and data delivery.
NEW QUESTION # 26
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: D
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. The dedicated third security radio on the 4800 pushes the power budget beyond what 802.3at can reliably support. IEEE 802.3ac is a VLAN tagging standard 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.
NEW QUESTION # 27
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