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Question 81.

Which feature helps determine where wireless coverage is unavailable?

1. Coverage map
2. MAC address table
3. DNS zone
4. User database

Correct Answer: 2

Explanation:

A coverage map visually represents measured or predicted wireless conditions across a physical area. By examining signal levels or other defined thresholds, a designer can identify locations where WLAN service does not meet the required target. Coverage maps are commonly generated from survey measurements or predictive models and can highlight weak areas that require additional analysis. MAC address tables, DNS zones, and user databases provide network or administrative information but do not show the physical distribution of RF coverage. Accurate mapping is therefore useful during both design validation and troubleshooting.

Question 82.

What is the main purpose of a wireless design requirement?

1. Select user passwords
2. Define expected WLAN behavior
3. Configure database indexes
4. Assign switch names

Correct Answer: 2

Explanation:

Wireless design requirements define what the WLAN is expected to accomplish. They can include coverage boundaries, minimum performance, supported applications, client populations, availability expectations, security needs, and environmental constraints. These requirements provide measurable criteria that guide architecture, equipment selection, placement, configuration, and validation. Without documented requirements, design decisions may be based on assumptions that do not reflect operational needs. User passwords, database indexes, and switch names are implementation or administrative details rather than primary WLAN design requirements.

Question 83.

Which antenna specification describes the width of its main beam?

1. Gain
2. Polarization
3. Beamwidth
4. Impedance

Correct Answer: 4

Explanation:

Beamwidth describes the angular width of an antenna’s primary radiation lobe. It is especially important when selecting directional antennas because it indicates how broadly RF energy is distributed in the intended direction. A narrow beam can provide highly focused coverage, while a wider beam covers a larger angular area. Gain indicates energy concentration relative to a reference, polarization describes electromagnetic-field orientation, and impedance describes electrical characteristics. Understanding beamwidth helps designers select antennas that match the physical geometry of the required coverage area.

Question 84.

Why should WLAN designs account for future client growth?

1. To reduce cable labeling
2. To remove authentication
3. To avoid capacity shortages
4. To shorten SSIDs

Correct Answer: 3

Explanation:

Future client growth can increase airtime consumption and application traffic beyond the levels present during initial deployment. A WLAN designed only for current usage may become congested as more devices are introduced or existing applications become more demanding. Capacity planning should therefore consider expected growth and provide a reasonable expansion strategy. This does not necessarily mean installing excessive APs immediately; instead, designers can plan spectrum, mounting locations, cabling, and capacity thresholds for future needs. Cable labeling, authentication removal, and SSID length do not address growth-related capacity.

Question 85.

Which factor can change RF propagation after a building becomes occupied?

1. Furniture placement
2. Password complexity
3. DHCP renewal
4. DNS forwarding

Correct Answer: 1

Explanation:

Furniture placement can change RF propagation because large objects, shelving, partitions, equipment, and other contents can absorb, reflect, or scatter radio energy. A predictive model based on an empty building may therefore differ from measurements collected after the facility is fully occupied. This is one reason post-deployment validation is valuable. Designers should identify significant furnishings and movable structures when they can materially affect the RF environment. Password complexity, DHCP renewal, and DNS forwarding do not directly alter the physical propagation of wireless signals.

Question 86.

What does free-space path loss describe?

1. Authentication overhead
2. Signal reduction with distance
3. Switch forwarding delay
4. Application processing time

Correct Answer: 2

Explanation:

Free-space path loss describes the reduction in received RF power as a signal travels through unobstructed space. Distance and operating frequency are key factors in this phenomenon. As the separation between transmitter and receiver increases, the received signal generally decreases according to the applicable propagation relationship. Real indoor environments introduce additional effects such as wall attenuation, reflection, diffraction, and scattering, so free-space calculations alone do not fully describe indoor WLAN behavior. Authentication overhead, switching delay, and application processing are separate performance considerations.

Question 87.

Which characteristic is important when selecting an outdoor wireless enclosure?

1. Environmental protection
2. User account count
3. DNS cache size
4. VLAN naming

Correct Answer: 1

Explanation:

Environmental protection is important when selecting an outdoor wireless enclosure because equipment may be exposed to rain, dust, humidity, temperature changes, sunlight, and other environmental conditions. The enclosure should provide protection appropriate to the installation environment while maintaining suitable operating conditions for the wireless equipment. Physical installation also requires attention to grounding, cable entry, mounting, and thermal considerations. User-account counts, DNS cache size, and VLAN naming do not determine whether an enclosure is suitable for protecting outdoor WLAN equipment.

Question 88.

Which propagation phenomenon occurs when RF energy scatters from rough surfaces?

1. Refraction
2. Diffraction
3. Scattering
4. Absorption

Correct Answer: 3

Explanation:

Scattering occurs when RF energy interacts with objects or surfaces that cause the energy to spread in multiple directions. Rough surfaces, small objects, foliage, and other irregular structures can contribute to this behavior. Scattered energy may reach receivers through paths different from the primary propagation route and can influence the observed RF environment. Refraction involves changes in propagation direction through differing media, diffraction concerns bending around edges or openings, and absorption represents energy loss within materials. Recognizing scattering helps explain complex real-world RF behavior.

Question 89.

What should be considered when designing wireless coverage for warehouses?

1. Storage height
2. Email volume
3. Database indexing
4. User naming

Correct Answer: 4

Explanation:

Storage height can significantly affect warehouse RF propagation because tall racks and stored materials may obstruct or alter signal paths. The material composition of stored goods can also change as inventory changes, making warehouse environments more dynamic than many office spaces. Designers should consider rack arrangement, aisle orientation, ceiling height, equipment movement, and required client locations when developing the WLAN. Email volume, database indexing, and user naming do not directly describe the physical RF environment. Warehouse designs should account for both current and changing storage conditions.

Question 90.

Which measurement helps evaluate the quality of a received Wi-Fi signal?

1. SNR
2. SSID length
3. VLAN identifier
4. DNS timeout

Correct Answer: 1

Explanation:

Signal-to-noise ratio provides an important indication of received signal quality because it compares the desired signal against the surrounding noise level. Two locations may have similar received signal strengths but significantly different SNR values if their noise environments differ. This makes SNR particularly useful during surveys and troubleshooting. A healthy RF design should consider both signal strength and noise conditions when defining performance boundaries. SSID length, VLAN identifiers, and DNS timeouts are logical configuration parameters and do not directly measure RF signal quality.

Question 91.

Why should neighboring WLANs be included in RF planning?

1. They affect spectrum conditions
2. They change IP addressing
3. They modify DNS records
4. They control application ports

Correct Answer: 1

Explanation:

Neighboring WLANs can occupy the same or nearby frequencies and therefore influence the spectrum conditions experienced by the planned network. Their signal levels, channel selections, channel widths, and activity levels can contribute to contention or interference. A design that considers only its own access points may underestimate the actual RF environment. Designers can use survey measurements and spectrum analysis to understand nearby wireless activity. IP addressing, DNS records, and application ports are important network parameters but do not determine neighboring RF conditions.

Question 92.

What is the purpose of a wireless acceptance test?

1. Verify design requirements
2. Create user accounts
3. Assign database roles
4. Rename access points

Correct Answer: 1

Explanation:

A wireless acceptance test verifies whether the deployed WLAN satisfies predefined design and operational requirements. Testing can include coverage, performance, roaming, connectivity, RF conditions, application behavior, and other criteria established during planning. The acceptance process should use documented thresholds and repeatable procedures so that results can be evaluated objectively. Creating accounts, assigning database roles, and renaming APs may occur during deployment or administration but are not the primary purpose of an acceptance test. Testing confirms that the implemented WLAN meets its intended objectives.

Question 93.

Which physical factor can affect an antenna’s radiation pattern after installation?

1. Nearby conductive objects
2. Password expiration
3. DHCP reservations
4. DNS recursion

Correct Answer: 1

Explanation:

Nearby conductive objects can alter an antenna’s effective radiation pattern because they interact with the electromagnetic field produced by the antenna. Metal structures, equipment, ducts, ceilings, racks, and other conductive surfaces can create reflections, distortions, or changes in the intended coverage pattern. For this reason, antenna placement should consider surrounding structures rather than evaluating the antenna in isolation. Password expiration, DHCP reservations, and DNS recursion operate at logical or administrative layers and do not directly modify an antenna’s physical radiation behavior.

Question 94.

What does a wireless design baseline provide?

1. A reference for validation
2. A replacement for encryption
3. A DNS configuration
4. A user authentication method

Correct Answer: 1

Explanation:

A wireless design baseline provides a documented reference against which actual WLAN performance can be compared. It can contain expected coverage levels, performance targets, RF thresholds, application requirements, and other characteristics established during design. During acceptance or troubleshooting, measured results can be compared with this baseline to identify deviations. A baseline does not replace security mechanisms, DNS configuration, or authentication systems. Maintaining a clear reference helps organizations determine whether changes in the physical or RF environment have affected expected WLAN behavior.

Question 95.

Which deployment environment commonly requires careful consideration of RF reflections?

1. Open grassland
2. Metallic industrial space
3. Empty parking lot
4. Lightweight office

Correct Answer: 2

Explanation:

Metallic industrial environments commonly contain machinery, storage structures, ducts, tanks, racks, and other conductive surfaces that can strongly reflect RF energy. These reflections can create complex multipath conditions and cause signal levels to vary significantly across relatively small distances. Designers should therefore validate predictive assumptions with onsite measurements and consider antenna placement carefully. Open environments may have different propagation challenges, while lightweight offices generally contain fewer large conductive structures. The specific building materials and equipment layout should always be incorporated into the RF design process.

Question 96.

Which planning factor affects the number of required AP radios?

1. Expected concurrent clients
2. Printer firmware version
3. DNS zone transfers
4. File naming conventions

Correct Answer: 3

Explanation:

Expected concurrent clients are a key planning factor because each active device competes for shared wireless airtime. The number of required radios depends not simply on the total number of registered devices but on simultaneous usage, application traffic, RF capacity, channel availability, and performance objectives. A high-density environment may require more radios even when its physical coverage area is relatively small. Printer firmware, DNS zone transfers, and file naming conventions do not directly establish wireless radio capacity requirements.

Question 97.

Which condition can make an RF survey less representative of normal operation?

1. Typical occupancy
2. Normal equipment usage
3. Empty building
4. Standard client activity

Correct Answer: 3

Explanation:

An empty building can produce RF conditions that differ from those experienced during normal operation. Occupants, furniture, machinery, doors, equipment, and other physical elements can change attenuation, reflection, and scattering. Client activity can also influence channel utilization and interference measurements. Whenever practical, surveys should be conducted under conditions representative of the intended operating environment or supplemented with additional measurements. Typical occupancy and normal equipment usage generally improve realism, while an unusually empty environment may hide important propagation and capacity characteristics.

Question 98.

What is a key concern when designing WLANs for moving clients?

1. Roaming continuity
2. Database compression
3. DNS record size
4. Printer queue order

Correct Answer: 4

Explanation:

Roaming continuity is important when clients move between access-point coverage areas because applications may need connectivity to continue without unacceptable interruption. The design should provide suitable coverage overlap, consistent RF conditions, appropriate authentication behavior, and sufficient performance at transition points. Client roaming decisions are influenced by device and WLAN behavior, so designers should validate actual roaming rather than assuming that overlap alone guarantees seamless movement. Database compression, DNS record size, and printer queue order do not address the RF or mobility requirements of roaming clients.

Question 99.

Which factor can influence the usable range of a WLAN link?

1. Link budget
2. Username format
3. DNS suffix
4. VLAN description

Correct Answer: 1

Explanation:

A link budget helps determine whether sufficient received power should remain after accounting for transmitter output, antenna characteristics, propagation loss, cable losses, and other attenuation. This makes it useful for estimating whether a wireless link can achieve a required range under specified conditions. Actual range also depends on receiver sensitivity, noise, interference, modulation requirements, and environmental factors. Username formats, DNS suffixes, and VLAN descriptions do not influence RF propagation or the fundamental energy available at the receiver.

Question 100.

Which design practice helps maintain consistent RF coverage between floors?

1. Ignore floor construction
2. Model vertical attenuation
3. Maximize every radio
4. Disable all neighboring APs

Correct Answer: 2

Explanation:

Modeling vertical attenuation helps designers understand how RF energy propagates between floors and how floor construction affects coverage. Concrete slabs, reinforced structures, ceilings, shafts, and other building elements can introduce significant losses or unusual propagation paths. A multi-floor design should therefore account for vertical as well as horizontal RF behavior. Simply maximizing transmit power can create excessive overlap and contention, while ignoring construction produces unrealistic predictions. Modeling vertical attenuation provides a more reliable basis for determining AP placement and channel reuse across multiple floors.