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Question 41.

Which design element defines where access points should be installed?

1. Placement plan
2. Password policy
3. Routing table
4. User directory

Correct Answer: 1

Explanation:

An access-point placement plan identifies suitable physical locations for wireless infrastructure based on coverage, capacity, building characteristics, antenna patterns, and deployment constraints. Proper placement helps ensure that the intended service areas receive adequate RF coverage while limiting unnecessary overlap and interference. A placement plan may originate from predictive modeling and then be refined through onsite validation. Password policies, routing tables, and user directories serve different network or administrative purposes and do not establish the physical positions of WLAN radios.

Question 42.

Why should wall attenuation values be included in predictive modeling?

1. To calculate VLAN capacity
2. To estimate signal loss
3. To determine DHCP scope
4. To configure authentication

Correct Answer: 2

Explanation:

Wall attenuation values allow predictive survey software to estimate how much RF energy will be lost when signals pass through different building materials. Without realistic attenuation assumptions, modeled coverage may significantly differ from actual conditions after deployment. Materials such as concrete, glass, drywall, and metal can have very different effects on propagation. Accurate material definitions therefore improve the usefulness of predictive results. VLAN capacity, DHCP scope configuration, and authentication settings are important network considerations but do not determine physical RF attenuation.

Question 43.

What does an antenna radiation pattern illustrate?

1. Cable temperature
2. Client authentication
3. RF energy distribution
4. IP subnet boundaries

Correct Answer: 3

Explanation:

An antenna radiation pattern illustrates how an antenna distributes RF energy across different directions. It can show the relative strength of the main lobe, side lobes, and nulls around the antenna. Understanding this pattern helps wireless designers determine whether an antenna is appropriate for a particular mounting position and coverage objective. A ceiling-mounted access point, for example, may produce a different effective pattern when installed near structural materials. Cable temperature, authentication, and IP subnet boundaries are unrelated to radiation-pattern characteristics.

Question 44.

What is the primary purpose of a post-deployment wireless survey?

1. Predict future construction
2. Validate actual performance
3. Assign network addresses
4. Document user accounts

Correct Answer: 2

Explanation:

A post-deployment wireless survey validates how the installed WLAN performs in the real environment. It can confirm coverage, signal levels, SNR, channel conditions, roaming behavior, throughput, and other requirements defined during design. Physical construction and installed equipment can differ from assumptions used in predictive models, making validation important. A post-deployment survey can also reveal unexpected interference or coverage gaps that require adjustment. Address assignment and account documentation are network administration activities rather than the primary purpose of RF validation.

Question 45.

Which environmental feature can create RF shadowing?

1. Large obstruction
2. Short SSID
3. Small DHCP pool
4. Static gateway

Correct Answer: 1

Explanation:

A large physical obstruction can create an RF shadow where signal strength behind the object is substantially reduced or behaves differently from surrounding areas. Examples can include machinery, reinforced structures, storage racks, elevator systems, and other dense objects. Shadowing can be especially important in industrial and warehouse environments where large structures change the expected propagation path. Designers should account for such obstacles during predictive modeling and onsite surveys. SSID length, DHCP pool size, and gateway configuration do not create physical RF shadowing.

Question 46.

What does minimum basic rate planning influence?

1. DNS response time
2. Client transmission behavior
3. Switch forwarding capacity
4. Authentication database size

Correct Answer: 2

Explanation:

Basic data rates establish the rates that WLAN devices must support for certain management and control communications. Adjusting the minimum basic rate can influence how far certain low-rate transmissions extend and can affect airtime efficiency and cell behavior. In carefully designed environments, disabling unnecessarily low rates may encourage clients to operate at more efficient rates and reduce excessive cell size. However, the decision must account for coverage and client requirements. DNS, switching, and authentication systems are not directly controlled by WLAN basic-rate configuration.

Question 47.

Why can lowering AP transmit power improve frequency reuse?

1. It reduces cell size
2. It increases cable length
3. It enlarges IP pools
4. It raises antenna impedance

Correct Answer: 1

Explanation:

Reducing access-point transmit power can decrease the physical size of an RF cell, which may allow the same channel to be reused more effectively at a shorter distance. This approach can be valuable in high-density WLANs where excessive cell overlap creates unnecessary contention. Transmit power should not simply be minimized without considering client capabilities, coverage requirements, and uplink balance. Cable length, IP pool size, and antenna impedance are unrelated to the basic mechanism. Power planning should maintain the required service level while supporting efficient channel reuse.

Question 48.

What does airtime fairness attempt to improve?

1. IP address allocation
2. Authentication speed
3. Medium access efficiency
4. Cable redundancy

Correct Answer: 3

Explanation:

Airtime fairness mechanisms attempt to distribute wireless transmission opportunities more efficiently among clients rather than allowing slower devices to consume disproportionate amounts of shared airtime. Because wireless capacity is fundamentally based on a shared medium, a client transmitting at a low rate may occupy the channel longer for the same amount of data. Airtime-oriented approaches can help improve overall medium efficiency in mixed-client environments. IP allocation, authentication processing, and cable redundancy address different networking concerns and are not the purpose of airtime fairness.

Question 49.

Which factor should influence an AP’s mounting height?

1. User password policy
2. Desired coverage geometry
3. DNS resolver count
4. Switch MAC table

Correct Answer: 2

Explanation:

Desired coverage geometry should influence access-point mounting height because the physical position of the radio and antenna affects the resulting RF pattern. Ceiling height, antenna characteristics, obstacles, client locations, and application requirements all contribute to determining an appropriate mounting position. Mounting an AP excessively high may increase the distance to clients, while an unsuitable low position can introduce obstructions or physical hazards. Password policies, DNS resolver counts, and switch MAC tables do not determine the RF coverage geometry created by AP placement.

Question 50.

Which metric helps determine whether a WLAN meets application throughput needs?

1. Actual throughput
2. SSID length
3. Gateway hostname
4. Antenna connector type

Correct Answer: 1

Explanation:

Actual throughput measures the amount of usable data successfully transferred through the wireless connection and is therefore valuable when validating application requirements. PHY data rates can be substantially higher than real application throughput because wireless protocols introduce overhead and because contention, retransmissions, interference, and other factors consume airtime. Testing actual throughput under representative conditions gives designers better evidence about whether the WLAN can support required workloads. SSID naming, gateway hostnames, and connector types do not directly establish application-level throughput.

Question 51.

Which condition can make roaming more difficult for WLAN clients?

1. Identical RF environments
2. Consistent coverage
3. Poor cell overlap
4. Stable channel planning

Correct Answer: 3

Explanation:

Poor cell overlap can make roaming more difficult because a client may move out of the useful coverage area of one access point before another AP provides a suitable alternative. Properly designed overlap gives clients opportunities to discover and associate with neighboring cells while maintaining adequate signal quality. Roaming behavior also depends on client capabilities, authentication mechanisms, WLAN configuration, and application requirements. Identical RF conditions, consistent coverage, and stable channel planning generally support predictable roaming rather than causing the problem described.

Question 52.

Why is client transmit power important during WLAN design?

1. It affects link symmetry
2. It changes DNS records
3. It expands VLAN identifiers
4. It controls switch buffers

Correct Answer: 1

Explanation:

Client transmit power is important because wireless communication is bidirectional. An access point may transmit at substantially higher power than a client, creating an asymmetric link in which the client can hear the AP but the AP cannot reliably hear the client. Such imbalance can contribute to poor connectivity and unexpected roaming behavior. Designers should consider both sides of the RF link rather than optimizing only AP transmit power. DNS records, VLAN identifiers, and switch buffers do not determine wireless link symmetry.

Question 53.

What is the purpose of an RF coverage threshold?

1. Identify acceptable service limits
2. Assign switch priorities
3. Define user passwords
4. Allocate IP addresses

Correct Answer: 1

Explanation:

An RF coverage threshold establishes a measurable boundary for acceptable wireless service. Depending on the design objective, the threshold may involve received signal strength, SNR, data rate, or another RF performance metric. Establishing explicit thresholds helps survey engineers identify coverage gaps and verify whether deployed access points satisfy design requirements. The appropriate threshold should be based on client capabilities and application needs rather than an arbitrary value. Switch priorities, passwords, and IP addressing are separate network configuration concerns.

Question 54.

Which condition can indicate excessive RF overlap?

1. Reduced IP utilization
2. Multiple strong neighboring cells
3. Fewer DHCP requests
4. Lower DNS latency

Correct Answer: 2

Explanation:

Multiple strong neighboring cells on the same or overlapping channels can indicate excessive RF overlap. Although some overlap is desirable for roaming, too much overlap can increase contention and co-channel activity, particularly in dense deployments. Designers should distinguish between intentional roaming overlap and unnecessary coverage duplication. RF analysis tools can help visualize neighboring signal levels and channel relationships. IP utilization, DHCP request frequency, and DNS latency may affect network operations but do not directly reveal whether RF cells overlap excessively.

Question 55.

Which technique can help locate a persistent non-Wi-Fi interferer?

1. VLAN analysis
2. DNS tracing
3. Spectrum analysis
4. Route inspection

Correct Answer: 3

Explanation:

Spectrum analysis can help identify persistent RF energy that is not represented as normal Wi-Fi frames. A spectrum analyzer can display activity across relevant frequencies and help identify characteristics such as duration, bandwidth, periodicity, and relative signal strength. This information can assist technicians in locating or characterizing sources such as industrial equipment, wireless video systems, or other transmitters. VLAN analysis, DNS tracing, and route inspection examine logical or network-layer behavior and generally cannot reveal a non-Wi-Fi RF source directly.

Question 56.

What is a major benefit of using site-specific RF measurements?

1. Reflect actual conditions
2. Remove all interference
3. Guarantee maximum throughput
4. Eliminate client variation

Correct Answer: 1

Explanation:

Site-specific RF measurements provide observations from the actual deployment environment rather than relying entirely on theoretical assumptions. Real buildings contain construction differences, furniture, equipment, reflective surfaces, unexpected obstacles, and interference sources that may not be represented accurately in a model. Measurements can therefore reveal conditions that require changes to AP placement, power, channel assignments, or other design parameters. They cannot remove interference, guarantee a particular throughput level, or eliminate differences among client devices. Field validation complements predictive planning rather than replacing engineering judgment.

Question 57.

Which physical property affects RF penetration through a material?

1. Material composition
2. User account age
3. IP lease period
4. DNS cache size

Correct Answer: 1

Explanation:

Material composition strongly affects how radio waves interact with a physical barrier. Density, conductivity, moisture content, thickness, and structural composition can all influence attenuation, reflection, and transmission. For example, metal and reinforced concrete may produce substantially different propagation effects from lightweight partitions. Understanding these characteristics allows wireless designers to create more realistic predictive models and interpret survey results accurately. User-account age, IP lease duration, and DNS cache size belong to higher network or administrative layers and have no direct role in RF penetration through physical materials.

Question 58.

What is the purpose of a wireless design floor plan?

1. Track software licenses
2. Represent physical deployment
3. Store authentication keys
4. Record DNS aliases

Correct Answer: 2

Explanation:

A wireless design floor plan represents the physical environment in which the WLAN will operate. It can identify rooms, walls, floors, access-point locations, antennas, obstacles, and other deployment features. Survey and planning tools commonly use floor plans to model propagation and visualize measurements. A properly scaled and accurate floor plan improves the reliability of placement decisions and RF predictions. Software licensing, authentication keys, and DNS aliases are administrative or logical information and are not the primary purpose of a wireless design floor plan.

Question 59.

Which design consideration is especially important for voice over WLAN?

1. Low latency
2. Large address pools
3. Long DNS records
4. High storage capacity

Correct Answer: 1

Explanation:

Voice applications are sensitive to network delay and variations in packet delivery. WLAN designs supporting voice therefore need to consider latency, jitter, packet loss, roaming behavior, RF coverage, airtime availability, and appropriate quality-of-service mechanisms. A network can provide basic connectivity while still failing to deliver the consistent performance required for real-time voice. Address-pool size, DNS record length, and storage capacity are not the primary RF performance considerations for voice traffic. Application requirements should guide WLAN design thresholds and validation procedures.

Question 60.

Which factor can significantly affect wireless performance in a crowded office?

1. Printer naming
2. File permissions
3. Client density
4. Server hostname

Correct Answer: 3

Explanation:

Client density can significantly affect WLAN performance because many active devices must share the available RF airtime. In a crowded office, laptops, smartphones, collaboration equipment, and other wireless devices may simultaneously compete for transmission opportunities. Even when coverage is strong, high airtime demand can increase contention and reduce effective throughput. Designers should therefore evaluate expected simultaneous users, application traffic, channel availability, and access-point capacity. Printer naming, file permissions, and server hostnames are unrelated to the fundamental RF capacity challenge created by dense client populations.