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Question 141.

Which document best defines the planned RF architecture?

1. Wireless design specification
2. DHCP lease table
3. User directory
4. Switch event log

Correct Answer: 1

Explanation:

A wireless design specification describes how the WLAN is intended to operate from an RF and infrastructure perspective. It can document radio requirements, coverage objectives, capacity assumptions, antenna selections, channel strategy, power parameters, and other design decisions. This document provides a reference for implementation and later validation. Operational records such as DHCP leases or switch logs may contain useful troubleshooting information, but they do not define the planned wireless architecture. Keeping the design specification current helps ensure that deployed infrastructure can be compared against the approved engineering design.

Question 142.

What should be determined before selecting a survey measurement interval?

1. Switch firmware version
2. Required spatial detail
3. User password policy
4. DNS record lifetime

Correct Answer: 2

Explanation:

The required spatial detail should guide the measurement interval used during a wireless survey. Areas containing many obstacles, changing RF conditions, or critical service requirements may need more frequent sampling to accurately represent the environment. A sparse measurement pattern can overlook localized coverage problems, while unnecessarily dense sampling increases survey effort without always adding useful information. The survey methodology should therefore balance accuracy with practical field requirements. Establishing the desired resolution before collecting measurements creates a more consistent dataset and makes subsequent heatmap interpretation more meaningful.

Question 143.

Which loss should be included when an antenna cable uses multiple connectors?

1. VLAN overhead
2. Authentication delay
3. Connector insertion loss
4. DHCP processing time

Correct Answer: 3

Explanation:

Connector insertion loss represents the small amount of RF power lost when a signal passes through a connector. If an antenna path contains several connectors, each connection can contribute additional attenuation. These losses should be included when calculating the total RF path budget. Ignoring them can result in an overly optimistic estimate of the power delivered to the antenna or received by the radio. Connector quality, frequency, and construction can influence the actual loss. Careful RF design therefore accounts for every significant passive component between the radio and antenna.

Question 144.

What does a receiver sensitivity specification indicate?

1. Minimum usable input level
2. Maximum Ethernet frame size
3. Highest antenna elevation
4. Lowest channel number

Correct Answer: 1

Explanation:

Receiver sensitivity identifies the approximate minimum signal level at which a receiver can successfully decode a transmission under specified conditions. The exact sensitivity depends on factors such as modulation, channel width, coding, and radio implementation. A lower required signal level generally allows a receiver to operate with weaker signals, but the associated data rate and performance requirements must also be considered. During WLAN design, receiver sensitivity helps determine whether the expected received signal provides adequate operating margin. It is therefore an important parameter when evaluating RF link feasibility and reliability.

Question 145.

Which RF parameter is commonly expressed in watts or dBm?

1. Antenna beamwidth
2. Transmit power
3. Channel reuse distance
4. Polarization angle

Correct Answer: 2

Explanation:

Transmit power describes the amount of RF energy produced by a radio and is commonly represented in watts or converted to dBm. Wireless equipment specifications and regulatory limits may use either representation depending on the context. Designers must distinguish transmit power from antenna gain because antenna gain changes the effective radiated result without being the same physical quantity as radio output power. Understanding the units also helps engineers perform accurate RF calculations. When configuring enterprise WLANs, transmit power should remain within equipment capabilities and applicable regulatory requirements.

Question 146.

Why must regulatory domains be considered during channel planning?

1. They determine keyboard layouts
2. They control user passwords
3. They define permitted RF operation
4. They increase switch memory

Correct Answer: 3

Explanation:

Regulatory domains determine which frequencies, power levels, and operational behaviors are permitted for wireless equipment in a particular jurisdiction. Channel availability and restrictions can therefore vary between regions. A WLAN design created without considering the applicable regulatory domain may select channels or power settings that cannot legally or technically be used at the deployment location. Engineers should verify the equipment’s configured region and the relevant local requirements before finalizing the RF plan. Regulatory compliance is part of responsible WLAN engineering and can directly affect available spectrum and channel choices.

Question 147.

What does a waterfall display show over time?

1. RF activity changes
2. User account changes
3. IP address leases
4. Cable length changes

Correct Answer: 1

Explanation:

A spectrum waterfall display represents RF energy across frequency as it changes over time. It is useful for identifying interference patterns that may not be obvious from a single spectrum snapshot. Continuous signals, intermittent transmissions, bursts, and changing frequency activity can become visible when measurements are viewed along a time axis. This makes waterfall analysis valuable during interference investigations. Engineers can use it to determine whether an observed RF source is persistent or sporadic and then correlate the pattern with possible physical or operational sources within the deployment environment.

Question 148.

Which interference type occupies a relatively small frequency range?

1. Wideband interference
2. Narrowband interference
3. Broadband noise
4. Full-spectrum activity

Correct Answer: 2

Explanation:

Narrowband interference concentrates its energy within a relatively limited portion of the frequency spectrum. Because its frequency footprint is smaller than that of wideband interference, a spectrum analyzer can often reveal a distinct localized signal pattern. Identifying the occupied range helps engineers determine which WLAN channels may be affected and whether changing channels could reduce the impact. The actual mitigation strategy depends on the source, its persistence, and the frequencies involved. Spectrum analysis should therefore be combined with knowledge of the physical environment when investigating suspected interference.

Question 149.

What characteristic describes interference that appears unpredictably?

1. Static behavior
2. Continuous operation
3. Intermittent behavior
4. Permanent occupancy

Correct Answer: 3

Explanation:

Intermittent interference appears only during certain periods rather than remaining continuously active. This behavior can make troubleshooting difficult because a conventional measurement taken during a quiet period may fail to capture the source. Examples can include equipment that activates periodically, devices that transmit in bursts, or machinery that operates according to a cycle. A spectrum analyzer with time-based visualization can help identify such patterns. Engineers should collect observations over an appropriate duration when investigating intermittent problems so that temporary RF activity is not mistaken for an absent interference source.

Question 150.

Which measurement helps evaluate packet delivery reliability?

1. Antenna height
2. Channel number
3. Packet loss
4. SSID character count

Correct Answer: 3

Explanation:

Packet loss measures the proportion of transmitted packets that fail to reach the intended destination successfully. Elevated packet loss can degrade applications even when nominal signal measurements appear acceptable. Real-time services are particularly sensitive because lost packets can contribute to interruptions or degraded media quality. Packet loss should be examined alongside other measurements such as latency, jitter, retransmissions, and application performance to determine the underlying cause. During WLAN validation, testing packet delivery at representative locations provides a more practical view of network behavior than relying solely on RF signal measurements.

Question 151.

Which metric measures variation in packet arrival timing?

1. Jitter
2. Throughput
3. Attenuation
4. Utilization

Correct Answer: 1

Explanation:

Jitter represents variation in packet arrival timing. Consistent delivery is important for applications that depend on predictable packet timing, particularly interactive audio and video. A network can have adequate average throughput while still producing poor application behavior if packet timing varies significantly. Wireless conditions, congestion, queuing, and retransmissions can contribute to jitter. For WLAN design validation, jitter should be measured as part of an application-oriented test rather than inferred solely from signal strength. Evaluating it alongside delay and packet loss provides a more complete picture of real-time traffic behavior.

Question 152.

What does latency primarily measure?

1. RF frequency range
2. Packet travel delay
3. Antenna electrical tilt
4. Channel reuse spacing

Correct Answer: 2

Explanation:

Latency measures the time required for information to travel between communicating endpoints or through a defined network path. High latency can negatively affect interactive applications because responses take longer to arrive. In a WLAN environment, delay may result from wireless contention, retransmissions, network congestion, processing, or other infrastructure factors. Measuring latency helps distinguish timing problems from issues such as insufficient throughput or excessive packet loss. For application validation, engineers should test latency under representative operating conditions instead of relying only on theoretical network specifications.

Question 153.

Which WMM category is intended for ordinary non-priority traffic?

1. Voice
2. Video
3. Best effort
4. Background

Correct Answer: 3

Explanation:

The Best Effort access category is generally used for ordinary application traffic that does not require the elevated contention treatment associated with voice or video. It sits between the higher-priority real-time categories and Background traffic within the standard WMM hierarchy. Correct traffic classification is important because assigning inappropriate access categories can affect how different applications compete for wireless airtime. Designers should understand how application markings are mapped into WMM categories and verify that the resulting behavior matches business requirements. Best Effort is not equivalent to guaranteed bandwidth or priority-free transmission.

Question 154.

What does DSCP-to-WMM mapping accomplish?

1. Translates traffic priorities
2. Changes antenna polarity
3. Expands RF bandwidth
4. Adjusts cable impedance

Correct Answer: 1

Explanation:

DSCP-to-WMM mapping associates Layer 3 traffic markings with wireless Quality of Service access categories. This allows packet priority information established in the network to influence how traffic is treated when it enters the WLAN. For example, traffic marked for real-time service can potentially be mapped into an appropriate high-priority WMM category. Correct mapping requires consistent policy across network components. Poorly designed mappings can cause traffic to receive unintended priority or contention behavior. Engineers should therefore document and test QoS mappings during WLAN deployment and validation.

Question 155.

Which traffic class normally has the lowest WMM priority?

1. Voice
2. Video
3. Best effort
4. Background

Correct Answer: 4

Explanation:

Background is the lowest-priority standard WMM access category. It is intended for traffic that can tolerate greater delay and contention before obtaining access to the wireless medium. Higher-priority categories such as Voice and Video receive more favorable contention parameters because their applications are typically more sensitive to delay and timing. Best Effort occupies an intermediate position for ordinary traffic. Proper classification helps prevent less time-sensitive applications from unnecessarily competing with latency-sensitive services. WLAN designers should verify that application traffic is assigned to the intended category throughout the network.

Question 156.

Which roaming mechanism stores authentication information for reuse?

1. PMK caching
2. Channel scanning
3. Beacon transmission
4. Antenna diversity

Correct Answer: 1

Explanation:

Pairwise Master Key (PMK) caching allows a client and infrastructure to retain authentication-related keying information so that it can be reused when the client returns to an access point or roams within an applicable WLAN environment. This can reduce the need to perform the entire authentication process again, helping shorten roaming-related delays. PMK caching is one of several mechanisms that can support efficient WLAN mobility. Its practical behavior depends on client and infrastructure implementation. Designers should verify interoperability when building roaming solutions around cached authentication information.

Question 157.

What is a common symptom of a sticky wireless client?

1. It remains attached too long
2. It changes SSIDs every second
3. It disables every radio
4. It creates additional VLANs

Correct Answer: 1

Explanation:

A sticky client may remain associated with an access point even after another nearby access point would provide a more suitable connection. Client roaming decisions are often influenced by device-specific algorithms, thresholds, and driver behavior rather than being completely controlled by infrastructure. Sticky behavior can result in degraded performance when the client continues using a weak or less appropriate association. WLAN designers can address such situations through appropriate cell design, roaming assistance features, minimum signal policies, and client-specific troubleshooting. Testing actual client behavior is essential because theoretical coverage alone cannot guarantee effective mobility.

Question 158.

Which mechanism can provide clients with transition recommendations?

1. 802.11v
2. 802.11a
3. 802.11b
4. 802.11g

Correct Answer: 1

Explanation:

IEEE 802.11v includes mechanisms that can assist infrastructure in providing BSS transition information to compatible clients. The goal is to help clients identify potentially more suitable neighboring access points or transition opportunities. The client still determines whether and when to act on the information, so infrastructure cannot assume that every recommendation will be followed. This capability can complement other roaming technologies and improve mobility behavior when client support is available. Designers should validate implementation details because support and behavior can differ across client operating systems and wireless chipsets.

Question 159.

What should a WLAN acceptance test compare against?

1. Personal device preferences
2. Defined acceptance criteria
3. Random channel selections
4. Unrecorded field observations

Correct Answer: 2

Explanation:

A WLAN acceptance test should compare measured results against predefined acceptance criteria established during the design process. These criteria may address coverage, RF quality, application performance, roaming behavior, capacity, or other project requirements. Using explicit criteria makes the validation process objective and repeatable. Without predetermined targets, engineers may have difficulty determining whether the deployment satisfies the intended design. Acceptance criteria should be documented before final testing whenever practical and should reflect the actual business and technical requirements established for the WLAN.

Question 160.

Why should post-change measurements use the same test method?

1. To preserve comparison validity
2. To increase SSID names
3. To alter client passwords
4. To reduce cable diameter

Correct Answer: 1

Explanation:

Using the same measurement method before and after a WLAN change makes comparisons more meaningful. If equipment, locations, settings, sampling methods, or test procedures change simultaneously, differences in results may be caused by the measurement process rather than the network modification. Consistency helps engineers determine whether an AP relocation, channel adjustment, power change, or other corrective action produced the expected effect. A documented testing procedure therefore improves repeatability and strengthens post-change validation. Engineers should preserve important test conditions whenever the goal is to compare two sets of wireless measurements.