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Question 341.

What is a primary benefit of using 20 MHz channels in dense deployments?

1. More reusable channels
2. Higher antenna gain
3. Longer DHCP leases
4. Larger certificate keys

Correct Answer: 1

Explanation:

Using 20 MHz channels can provide more independent channel choices within a given frequency band than wider channel configurations. In dense WLAN environments, this can improve frequency reuse and reduce the amount of spectrum consumed by each individual transmission. Wider channels can provide greater peak throughput for suitable clients, but they also consume more spectrum and may reduce the number of simultaneously usable channels. Channel width should therefore be selected according to client density, traffic requirements, available spectrum, and interference conditions rather than choosing the widest possible setting by default.

Question 342.

What is a major design concern when using 160 MHz channels?

1. Reduced IP addressing
2. Limited contiguous spectrum
3. Smaller antenna elements
4. Shorter authentication timers

Correct Answer: 2

Explanation:

A 160 MHz channel requires a large amount of contiguous or appropriately aggregated spectrum. In many WLAN environments, especially dense ones, finding sufficiently clean spectrum for reliable 160 MHz operation can be difficult. DFS requirements and neighboring networks can further reduce practical availability. Although 160 MHz channels can provide high peak throughput for compatible clients, their broad spectral footprint can reduce frequency reuse. A designer should therefore evaluate actual spectrum availability, client capabilities, regulatory constraints, and application needs before selecting 160 MHz operation for a deployment.

Question 343.

What does transmit-power asymmetry commonly refer to in WLAN design?

1. AP and client power differ
2. Antenna connectors use different metals
3. Switches have unequal VLAN counts
4. Clients receive different certificates

Correct Answer: 1

Explanation:

Transmit-power asymmetry occurs when the access point and client transmit at substantially different power levels. An AP may be capable of transmitting more strongly than a typical client device, creating a situation where the client can hear the AP at distances where the AP cannot reliably hear the client. This can produce misleading coverage results and unreliable communication near the apparent cell edge. Designers should consider both directions of the wireless link rather than relying solely on AP transmit power. Client capabilities, antenna characteristics, and regulatory limits should all be included in link-budget analysis.

Question 344.

What can a sticky client cause after moving toward a closer AP?

1. Reduced cable resistance
2. Unnecessary IP renewal
3. Delayed roaming
4. Increased spectrum width

Correct Answer: 3

Explanation:

A sticky client may remain associated with an earlier access point even after moving into an area where another AP provides a stronger or more appropriate connection. Because roaming decisions involve both client behavior and WLAN infrastructure characteristics, a client may delay reassociation despite changing RF conditions. This can result in lower data rates, poor signal quality, or degraded application performance. Designers should investigate client roaming behavior, signal thresholds, scan behavior, and AP placement rather than assuming that increasing AP transmit power will solve the problem.

Question 345.

What does roaming hysteresis help prevent?

1. Frequent back-and-forth AP changes
2. Excessive DHCP addresses
3. Incorrect cable termination
4. Oversized certificates

Correct Answer: 1

Explanation:

Roaming hysteresis introduces a difference between the conditions required to move away from the current AP and those required to select another AP. This helps prevent a client from repeatedly switching between access points when their signal levels are close or fluctuate around a decision threshold. Excessive roaming can create instability and unnecessary signaling. DHCP allocation, cable termination, and certificate size are unrelated to roaming hysteresis. WLAN designers should consider hysteresis alongside minimum RSSI thresholds, AP placement, client behavior, and application requirements when optimizing mobility across overlapping coverage areas.

Question 346.

What does a probe request allow a wireless client to do?

1. Negotiate Ethernet speed
2. Discover WLAN networks
3. Renew a TLS certificate
4. Measure cable loss

Correct Answer: 2

Explanation:

A probe request is a wireless management frame that a client can use to discover nearby WLANs. Clients may send directed or broadcast-style probe requests depending on their scanning behavior and network configuration. Access points can respond with information about supported WLANs, allowing the client to evaluate available networks before association. Probe traffic is therefore relevant to WLAN discovery and roaming behavior. Ethernet negotiation, certificate renewal, and cable-loss measurement occur at different layers or through different mechanisms and are not functions of a probe request.

Question 347.

What is a potential impact of an excessively long beacon interval?

1. Faster spectrum recovery
2. More frequent beacon transmission
3. Delayed network discovery
4. Higher PoE availability

Correct Answer: 3

Explanation:

The beacon interval determines how frequently an AP transmits beacon frames. If the interval is increased substantially, clients may receive periodic WLAN information less frequently, which can affect discovery, synchronization, and certain power-management behaviors. A shorter interval creates more frequent management-frame transmissions but also consumes additional airtime. Therefore, the beacon interval should be selected carefully rather than changed solely to improve a perceived performance issue. PoE availability and spectrum recovery are unrelated to beacon timing, while more frequent beacon transmission results from reducing rather than increasing the interval.

Question 348.

What does the DTIM interval influence for power-saving clients?

1. Delivery timing of buffered broadcasts
2. Antenna cable impedance
3. RADIUS server capacity
4. DFS radar sensitivity

Correct Answer: 1

Explanation:

The Delivery Traffic Indication Message interval influences when power-saving clients are informed about buffered broadcast and multicast traffic. Clients using power-saving mechanisms can remain asleep between appropriate wake periods and retrieve buffered traffic according to the DTIM schedule. A shorter DTIM interval can make buffered traffic available more frequently but may require clients to wake more often. A longer interval can improve sleep opportunities but may increase delivery delay for certain traffic. DTIM settings should therefore be evaluated alongside application requirements, multicast behavior, and battery-life objectives.

Question 349.

What is a key purpose of airtime fairness?

1. Equalize cable lengths
2. Reduce certificate renewals
3. Limit slow-client airtime consumption
4. Increase antenna polarization

Correct Answer: 3

Explanation:

Airtime fairness seeks to prevent slower clients from consuming a disproportionate amount of shared wireless airtime. Because a low-rate transmission can occupy the medium longer than a high-rate transmission carrying a similar amount of data, an unmanaged client population can allow slower devices to reduce overall efficiency. Airtime-fairness mechanisms attempt to distribute access more appropriately according to the platform’s implementation. This does not equalize cable lengths, modify certificates, or alter antenna polarization. Designers should evaluate the feature carefully because fairness policies can affect different client types and traffic patterns.

Question 350.

What is a common purpose of band steering?

1. Move suitable clients toward a preferred band
2. Increase fiber strand count
3. Extend certificate expiration
4. Change DHCP relay addresses

Correct Answer: 1

Explanation:

Band steering is used to encourage compatible clients toward a preferred frequency band, often by influencing WLAN discovery or association behavior. For example, a designer may encourage capable dual-band clients to use a less congested band when appropriate. Band steering does not guarantee client behavior because the final decision can remain partly under client control. It also does not modify fiber infrastructure, certificate lifetimes, or DHCP relay settings. Its usefulness depends on client compatibility, band coverage, spectrum utilization, and the overall RF design.

Question 351.

What can client load balancing attempt to improve?

1. Antenna impedance
2. Distribution of clients across APs
3. Cable weather resistance
4. RADIUS encryption strength

Correct Answer: 2

Explanation:

Client load-balancing mechanisms can attempt to distribute associated clients across suitable access points rather than allowing one AP to become unnecessarily overloaded while nearby APs have available capacity. Implementations may use association responses, client counts, RF measurements, or other vendor-specific logic. Load balancing is not the same as RF coverage optimization and cannot compensate for poor AP placement or insufficient spectrum. Antenna impedance, cable weather resistance, and RADIUS encryption are separate design concerns. Any load-balancing policy should be tested with real clients because aggressive association controls can sometimes produce undesirable behavior.

Question 352.

Why can multicast traffic require special WLAN consideration?

1. It always uses unicast addressing
2. It can consume shared airtime
3. It cannot cross VLANs
4. It changes antenna polarization

Correct Answer: 2

Explanation:

Multicast traffic is delivered to multiple receivers and can consume wireless airtime in ways that differ from ordinary unicast traffic. Depending on the WLAN implementation, multicast frames may use conservative transmission behavior, potentially increasing airtime consumption and reducing efficiency. Applications such as streaming, discovery, and collaboration can therefore generate meaningful multicast load. Designers should evaluate multicast rates, application requirements, IGMP behavior, and available optimization features. Multicast is not inherently limited to a single VLAN and does not alter antenna polarization. Careful traffic analysis helps determine whether multicast is contributing to capacity problems.

Question 353.

What does broadcast containment seek to reduce?

1. Unnecessary broadcast propagation
2. Antenna mounting stress
3. Cable attenuation
4. Certificate renewal frequency

Correct Answer: 1

Explanation:

Broadcast containment limits unnecessary broadcast traffic from propagating across portions of a WLAN or wired network where that traffic is not required. Excessive broadcasts can consume airtime and processing resources, particularly in large client populations. A containment strategy may involve network segmentation, filtering, gateway policies, or platform-specific controls. The goal is to keep broadcast traffic within an appropriate scope while preserving services that legitimately depend on it. Antenna mounting, RF cable attenuation, and certificate renewal are unrelated. Designers should understand application dependencies before filtering broadcasts that clients may actually require.

Question 354.

What is an important consideration for a guest captive portal?

1. Guest traffic policy enforcement
2. Antenna connector plating
3. DFS calibration frequency
4. Fiber core diameter

Correct Answer: 1

Explanation:

A guest captive portal is commonly used to present an access or policy page before granting broader network access. The WLAN design should define how guest traffic is isolated, authenticated or acknowledged, filtered, and routed after the portal interaction. The portal itself should not be treated as the complete guest-security architecture. Firewall rules, segmentation, DNS behavior, Internet access policies, and client isolation may also be required. Antenna connector construction, DFS calibration, and fiber characteristics address different technical layers and do not establish an effective guest-access policy.

Question 355.

What is the primary role of a WLAN firewall policy?

1. Increase RF propagation
2. Control permitted network traffic
3. Improve antenna diversity
4. Adjust beacon timing

Correct Answer: 2

Explanation:

Firewall policies define which network traffic is allowed or denied between specified sources, destinations, services, or security zones. In WLAN environments, firewall controls can be used to separate guest users from internal resources, restrict application access, or enforce organizational security requirements. Firewall policies operate at the network-security layer and do not directly change RF propagation, antenna diversity, or beacon timing. A complete WLAN security design should combine firewall policy with authentication, segmentation, encryption, monitoring, and appropriate management controls so that wireless access does not unintentionally expose protected network resources.

Question 356.

What should a WLAN acceptance test verify?

1. Only AP cosmetic appearance
2. Actual design requirements
3. Maximum possible cable length
4. Every available RF channel

Correct Answer: 2

Explanation:

An acceptance test should determine whether the installed WLAN meets the documented requirements established during design. Depending on the project, these requirements can include coverage, minimum signal quality, throughput, roaming, application performance, authentication, capacity, and availability. Testing only cosmetic installation details or unrelated maximum cable lengths does not demonstrate service compliance. Likewise, there is no requirement to test every possible RF channel. Acceptance criteria should be measurable and agreed upon before testing so that results can be evaluated consistently and the final deployment can be formally validated.

Question 357.

What should an as-built WLAN document capture?

1. Final installed configuration
2. Original design assumptions only
3. Unused antenna models
4. Hypothetical interference sources

Correct Answer: 1

Explanation:

As-built documentation records the actual deployed WLAN rather than merely the original design proposal. It can include final AP locations, device identifiers, installed antennas, cable paths, switch connections, configuration details, VLAN assignments, and relevant RF survey results. Maintaining accurate as-built information helps future engineers troubleshoot problems, perform changes, and understand the production environment. Original assumptions remain useful historical information, but they should not replace actual deployment records. Unused hardware and hypothetical interference sources are not substitutes for documenting what was ultimately installed and configured.

Question 358.

Why should survey equipment calibration information be recorded?

1. To select SSID names
2. To prove measurement equipment was maintained
3. To increase AP transmit power
4. To expand IP ranges

Correct Answer: 2

Explanation:

Recording calibration information helps establish confidence in measurements collected during a professional WLAN survey. Calibration status, equipment identification, and relevant test configuration can provide useful evidence that the measurement tools were maintained according to appropriate procedures. This becomes particularly important when survey results are used to validate design requirements or investigate disputes about measured performance. Calibration records do not increase AP power, determine SSID names, or expand IP ranges. A survey report should therefore preserve sufficient equipment and configuration information to make the measurement process understandable and repeatable.

Question 359.

What is a useful benefit of preserving survey file versions?

1. Compare design changes over time
2. Increase antenna output power
3. Shorten authentication exchanges
4. Modify cable impedance

Correct Answer:1

Explanation:

Maintaining versions of survey files allows WLAN professionals to compare how the RF environment and design evolved throughout a project. Earlier versions can show original AP placement, coverage predictions, channel assignments, or measured conditions, while later versions can document adjustments after installation and tuning. Version history also supports troubleshooting and change management by providing a record of what changed and when. It does not directly affect antenna power, authentication timing, or cable impedance. Proper naming, timestamps, project identifiers, and controlled storage can make survey archives much easier to use.

Question 360.

What is the main purpose of post-change verification?

1. Confirm the change achieved its objective
2. Replace the WLAN baseline
3. Disable monitoring systems
4. Remove configuration backups

Correct Answer: 1

Explanation:

Post-change verification determines whether a WLAN modification produced the intended result without introducing unacceptable side effects. After changing channels, transmit power, antenna placement, firmware, QoS settings, or other parameters, engineers should compare relevant measurements and service behavior against the defined objective and baseline. Verification can include RF measurements, client connectivity, application testing, roaming checks, or capacity observations depending on the change. Disabling monitoring or deleting backups would reduce operational visibility and recovery options. A documented verification step provides evidence that the change was successful and supports future troubleshooting.