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| Section | Objectives |
|---|---|
| Topic 1: RF Fundamentals and Design Principles | - RF behavior and propagation - Antenna types and placement strategies - Channel planning and interference mitigation |
| Topic 2: High Availability and Performance Optimization | - Redundancy design for controllers and APs - Load balancing and RF optimization |
| Topic 3: Troubleshooting and Validation | - Wireless performance troubleshooting methodologies - Validation tools and post-deployment testing |
| Topic 4: Wireless Security Design | - WPA2/WPA3 enterprise security design - 802.1X authentication and RADIUS integration - Guest access and segmentation strategies |
| Topic 5: Wireless Site Survey and Requirements Analysis | - Coverage and capacity planning - Physical environment assessment and constraints - Business and technical requirements gathering |
| Topic 6: Cisco Wireless Architecture | - Mobility groups and roaming design - Lightweight Access Point (LAP) deployment models - Controller-based architecture (WLC) |
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질문 # 122
A wireless consultant must design a Cisco WLAN. The consultant recommends a solution that requires 12 Cisco 9100 Series APs connected to a Cisco 3800 Series PoE+ switch. Each AP requires PoE+ for full functionality. What is the total PoE requirement in watts?
정답：D
설명：
This question requires a straightforward PoE power budget calculation. The IEEE 802.3at standard (PoE+) delivers a maximum of 30W at the Power Sourcing Equipment (PSE/switch port). Cisco 9100 Series access points such as the C9120, C9130, and C9136 are designed to operate with full functionality using PoE+ at 30W per AP. The total PoE power requirement for 12 APs is calculated as:
12 APs ?30W per AP = 360W. This figure represents the total power draw that the Cisco 3800 Series PoE+ switch must be capable of supplying across the connected AP ports simultaneously.
The Cisco Catalyst 3800 Series switches offer a total PoE power budget that must be validated against this 360W requirement during the design phase.
Note that some Cisco 9100 APs support higher power modes through IEEE 802.3bt (PoE++), which can provide up to 90W -- but the question specifies PoE+ (802.3at) for the switch infrastructure, making 30W ?12 = 360W the correct answer. Option D (720W) would correspond to 24 APs at 30W each.
질문 # 123
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?
정답：D
설명：
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.
질문 # 124
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?
정답：B
설명：
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. Reference: WLSD Study Guide - Outdoor AP Deployment, Fiber vs. Copper Distance Limitations, Outdoor Power Solutions.
질문 # 125
A wireless engineer must design a backhaul link. The engineer has a mesh access point that has a wired connection back to the infrastructure. What must be changed in the AP role before a change is made in the AP mode?
정답：C
설명：
In Cisco mesh networking architecture, access points are classified into two primary roles: Root Access Points (RAP) and Mesh Access Points (MAP). A RAP is an access point that maintains a wired Ethernet backhaul connection back to the network infrastructure, while a MAP operates wirelessly, relying on mesh backlinks to upstream RAPs. When an engineer needs to change an AP mode - such as switching to bridge mode to extend the mesh - the AP role must first be defined correctly. The AP must be designated as a RAP before any mode-level configuration changes are applied. This sequencing is critical because the AP role defines the fundamental backhaul path; changing the mode without first establishing the role results in misconfiguration and potential connectivity loss. The RAP communicates directly with the wired infrastructure via its Ethernet port, making it the gateway for all downstream MAPs in the mesh topology. Options A (monitor), C (bridge), and D (local) refer to AP modes, not roles, and cannot be configured until the role is properly defined.
Reference: WLSD Study Guide - Mesh Networking Fundamentals, Outdoor Wireless Design, AP Role and Mode Configuration.
질문 # 126
An engineer is designing a solution where guests terminate on an anchor controller in the DMZ. The engineer is having issues and wants to test connectivity between members of a mobility group. Which two steps must be performed to test whether a mobility control packet can be reached over the management interface?
(Choose two.)
정답：C,E
설명：
To test whether mobility control packets can reach between WLC peers in a mobility group (used to validate the anchor controller DMZ setup), two steps are required. First, the mping (mobility ping) command (Option A) is the Cisco WLC CLI tool specifically designed to test mobility control path connectivity between WLC peers. Running mping on both WLCs verifies that mobility control messages (UDP port 16666) can be exchanged bidirectionally. Second, UDP port 16666 must be open between the WLCs (Option C) - mping uses this port, and if it is blocked by a firewall (which is common when the anchor is in a DMZ), the mobility control path cannot be established. These two steps together - sending mping packets and confirming the firewall permits UDP 16666 - validate mobility control plane connectivity. The eping (EoIP ping) command (Option B) tests the data path tunnel, not the control path. IP Protocol 97 (Option D) is for the data plane in legacy mobility mode. Tracert (Option E) traces routing paths but does not validate mobility protocol connectivity. Reference: WLSD Study Guide - Mobility Group Troubleshooting, mping Command, UDP
16666 Firewall Requirements.
질문 # 127
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