Certified Wireless Design Professional (CWDP-305) — Questions and Answers

Question 1: What is the recommended minimum signal-to-noise ratio (SNR) for reliable VoWLAN (Voice over WLAN)?

40 dB
25 dB or higher (Correct answer)
10 dB
5 dB

Correct answer: 25 dB or higher

Voice over WLAN requires an SNR of at least 25 dB to maintain call quality, which is higher than the minimum for data applications due to voice's sensitivity to latency, jitter, and packet loss.

Question 2: Which client behavior is improved by deploying IEEE 802.11v BSS Transition Management in a high-density environment?

Load balancing by steering overloaded APs' clients to less-utilized APs (Correct answer)
Automatic IP address renewal during roam
Automatic channel selection by clients
Disabling power save mode on clients

Correct answer: Load balancing by steering overloaded APs' clients to less-utilized APs

802.11v BTM allows overloaded APs to request clients move to underutilized neighbors, improving overall load distribution.

Question 3: What is the primary advantage of using a mesh WLAN architecture over a traditional wired infrastructure deployment in outdoor environments?

Elimination of cabling requirements by using wireless backhaul between nodes (Correct answer)
Lower latency for all mesh hops
Support for more clients per access point
Higher throughput than wired backhaul

Correct answer: Elimination of cabling requirements by using wireless backhaul between nodes

Mesh networks use wireless backhaul between nodes, avoiding the need to trench cables to every AP location.

Question 4: A hospital deploys VoWi-Fi phones. Nurse stations are 30 meters apart. What AP density consideration ensures seamless voice roaming?

Single AP per floor with high-gain directional antenna
Roaming disabled to keep phones on one AP
Cell coverage overlap of 15–20% at -67 dBm or better (Correct answer)
APs only at nurse stations with no overlap

Correct answer: Cell coverage overlap of 15–20% at -67 dBm or better

Overlapping coverage at -67 dBm ensures VoWi-Fi phones always have a strong candidate AP available before initiating a roam.

Question 5: What is co-channel interference (CCI) in a WLAN environment?

Interference between access points operating on the same channel (Correct answer)
Interference caused by devices operating on adjacent channels
Interference caused by multipath signal reflections
Interference originating from non-802.11 RF emitters

Correct answer: Interference between access points operating on the same channel

CCI occurs when two or more APs share the same channel and their coverage areas overlap, causing them to contend for airtime and degrade performance.

Question 6: Which tool is most commonly used to visualize RF channel assignments and coverage across a floor plan during the design phase?

Protocol analyzer
Spectrum analyzer
Network management system
RF planning / heat map software (Correct answer)

Correct answer: RF planning / heat map software

RF planning software (such as Ekahau or iBwave) generates predictive heat maps that overlay channel assignments and coverage patterns onto floor plans before deployment.

Question 7: When designing an outdoor mesh for a smart city deployment, which protocol is used by mesh nodes to discover routes and forward traffic efficiently?

STP (Spanning Tree Protocol)
OSPF over wireless links
Hybrid Wireless Mesh Protocol (HWMP) defined in IEEE 802.11s (Correct answer)
ARP flooding between mesh nodes

Correct answer: Hybrid Wireless Mesh Protocol (HWMP) defined in IEEE 802.11s

IEEE 802.11s defines HWMP as the default path selection protocol for Wi-Fi mesh networks.

Question 8: What is 'sticky client' behavior and why is it problematic in enterprise WLAN design?

APs that do not release client associations after timeout
Clients configured to use 2.4 GHz exclusively
Clients that maintain association with a distant AP despite a closer one being available (Correct answer)
Clients that support 802.11r and roam too frequently

Correct answer: Clients that maintain association with a distant AP despite a closer one being available

Sticky clients stay connected to a far AP with weak RSSI rather than roaming to a closer one, degrading throughput and reliability.

Question 9: What is the purpose of BSS Coloring in 802.11ax?

To assign different frequencies to different access points
To reduce co-channel interference by allowing devices to differentiate between their BSS and overlapping BSSs (Correct answer)
To change the color of the LED indicators on access points
To encrypt wireless frames with color-coded keys

Correct answer: To reduce co-channel interference by allowing devices to differentiate between their BSS and overlapping BSSs

BSS Coloring assigns a unique identifier (color) to each Basic Service Set, allowing devices to quickly determine if a detected frame belongs to their own BSS or an overlapping one, improving spatial reuse.

Question 10: Which type of site survey is performed before deploying a wireless network?

On-demand survey
Passive survey
Predictive survey (Correct answer)
Post-deployment survey

Correct answer: Predictive survey

A predictive site survey is performed before any access points are physically deployed. It utilizes software tools and floor plans to model the RF environment, estimate signal coverage, and determine optimal access point locations and configurations based on design requirements, thereby saving time and resources during the actual deployment phase.

Question 11: What is the impact of hidden node problem on WLAN capacity?

Clients behind walls cannot connect to the network
Access points hidden in ceiling tiles have reduced range
Hidden network names reduce available bandwidth
Clients that cannot detect each other transmit simultaneously, causing collisions at the AP (Correct answer)

Correct answer: Clients that cannot detect each other transmit simultaneously, causing collisions at the AP

The hidden node problem occurs when two clients can communicate with the same AP but cannot detect each other, leading to simultaneous transmissions that collide at the AP, wasting airtime and reducing throughput.

Question 12: A CWDP is designing a parking lot WLAN using outdoor APs. What IP67 rating indicates about the AP enclosure?

The AP has 6 radios and 7 antenna ports
The AP meets IEEE 802.11 revision 6.7 specifications
The AP supports 6 GHz Wi-Fi and 7 watts of PoE
The enclosure is dust-tight and protected against immersion up to 1 meter for 30 minutes (Correct answer)

Correct answer: The enclosure is dust-tight and protected against immersion up to 1 meter for 30 minutes

IP67 means the enclosure is fully dust-tight (6) and can withstand water immersion up to 1 meter for 30 minutes (7).

Question 13: In a stadium deployment requiring coverage of tiered seating, which antenna configuration is most effective?

Multiple sector antennas aimed at seating sections (Correct answer)
Yagi antennas pointed at the center court
Single high-gain omnidirectional at center court
Distributed antenna system with low-gain elements

Correct answer: Multiple sector antennas aimed at seating sections

Sector antennas aimed at specific seating zones provide targeted coverage without wasting signal toward empty areas.

Question 14: What is a key advantage of using directional antennas in wireless network design?

Requires fewer access points.
Reduces interference and improves signal strength in a specific direction. (Correct answer)
Eliminates the need for RF planning.
Covers all directions equally.

Correct answer: Reduces interference and improves signal strength in a specific direction.

Directional antennas focus their radio frequency energy into a specific direction, creating a stronger signal lobe in that intended area while minimizing signal radiation elsewhere. This focused transmission reduces interference with other devices or networks and allows for stronger, more reliable connections over longer distances in the desired direction.

Question 15: What IEEE amendment enables BSS Transition Management, allowing APs to suggest better APs to clients?

802.11r
802.11w
802.11v (Correct answer)
802.11k

Correct answer: 802.11v

802.11v BSS Transition Management allows APs to send BTM Request frames suggesting clients move to a better AP.

Question 16: Which IEEE 802.11 amendment introduced OFDMA and target wake time (TWT)?

802.11ax (Wi-Fi 6) (Correct answer)
802.11n (Wi-Fi 4)
802.11ac (Wi-Fi 5)
802.11be (Wi-Fi 7)

Correct answer: 802.11ax (Wi-Fi 6)

IEEE 802.11ax (Wi-Fi 6) introduced Orthogonal Frequency Division Multiple Access (OFDMA) for efficient multi-user uplink/downlink and Target Wake Time (TWT) for improved power management.

Question 17: What is the purpose of using diversity antennas on an access point?

To increase EIRP beyond single-antenna limits
To double the transmit power output
To reduce multipath fading by selecting the best signal path (Correct answer)
To broadcast on two channels simultaneously

Correct answer: To reduce multipath fading by selecting the best signal path

Antenna diversity selects the best-receiving antenna at any moment, mitigating multipath-induced signal fading.

Question 18: In a CWDP design, what is the purpose of 'band steering' in relation to client mobility?

Prevent clients from roaming between APs
Force clients to use 5 GHz to reduce 2.4 GHz congestion (Correct answer)
Assign clients to specific channels based on RSSI
Increase transmit power on 5 GHz to attract clients

Correct answer: Force clients to use 5 GHz to reduce 2.4 GHz congestion

Band steering encourages capable clients to associate on 5 GHz, freeing 2.4 GHz for legacy devices and reducing interference.

Question 19: What role does the 802.11k amendment play in wireless network design?

It provides neighbor report information to help clients make better roaming decisions (Correct answer)
It establishes security protocols for WPA3
It defines QoS prioritization for voice traffic
It sets power output limits for access points

Correct answer: It provides neighbor report information to help clients make better roaming decisions

802.11k provides radio resource measurement capabilities, including neighbor AP reports that help clients identify the best AP to roam to, reducing scanning time and improving roaming performance.

Question 20: In the US, the FCC limits maximum EIRP for point-to-multipoint 5 GHz outdoor links to which value?

40 dBm
53 dBm
36 dBm (Correct answer)
30 dBm

Correct answer: 36 dBm

The FCC limits point-to-multipoint EIRP in the 5 GHz UNII bands to 36 dBm for outdoor use.

Question 21: What is the benefit of using band steering in dual-band wireless networks?

Forces all devices onto the 2.4 GHz band.
Eliminates interference in the 2.4 GHz band.
Reduces the need for multiple access points.
Encourages devices to connect to the 5 GHz band. (Correct answer)

Correct answer: Encourages devices to connect to the 5 GHz band.

Band steering is a feature in dual-band access points that intelligently guides compatible client devices towards the less congested and higher-performing 5 GHz Wi-Fi band. This helps to offload traffic from the often-crowded 2.4 GHz band, improving overall network efficiency and user experience by leveraging the faster speeds and greater capacity of 5 GHz.

Question 22: What information should be gathered during a pre-survey site visit?

Only the number of rooms in the building
Building materials, ceiling heights, existing infrastructure, RF interference sources, and client requirements (Correct answer)
The building's electrical consumption data
Previous tenant's network design documents only

Correct answer: Building materials, ceiling heights, existing infrastructure, RF interference sources, and client requirements

A thorough pre-survey visit documents construction materials (wall composition, glass types), ceiling types and heights, existing cabling and mounting points, potential RF interference sources, aesthetic requirements, and client needs.

Question 23: How does RF attenuation differ between 2.4 GHz and 5 GHz when penetrating building materials?

5 GHz signals experience greater attenuation through most building materials than 2.4 GHz (Correct answer)
Neither frequency is affected by building materials
2.4 GHz experiences more attenuation than 5 GHz
Both frequencies attenuate equally through all materials

Correct answer: 5 GHz signals experience greater attenuation through most building materials than 2.4 GHz

Higher frequency signals (5 GHz) experience greater absorption and attenuation when passing through building materials compared to lower frequency signals (2.4 GHz), resulting in shorter effective range.

Question 24: What is the half-power beamwidth (HPBW) of an antenna?

The angle at which the antenna gain drops to 3 dB below peak (Correct answer)
The total angle covered by the antenna pattern
The beamwidth at which interference is eliminated
The angle between the two nulls in the radiation pattern

Correct answer: The angle at which the antenna gain drops to 3 dB below peak

HPBW is the angular width measured between the two points where gain falls to half (-3 dB) of its maximum value.

Question 25: How does DSCP markings relate to WMM access categories in a Voice over WLAN deployment?

DSCP is only used for wired uplink QoS
APs map DSCP values to WMM AC queues for traffic prioritization (Correct answer)
WMM replaces DSCP in all enterprise deployments
DSCP values are ignored by wireless APs

Correct answer: APs map DSCP values to WMM AC queues for traffic prioritization

APs inspect DSCP markings on incoming IP packets and map them to the appropriate WMM access category queue.

Question 26: What is the recommended approach when users report intermittent connectivity issues?

Reboot the wireless controller
Immediately replace all access points
Increase transmit power on all APs to maximum
Correlate the timing with potential interference sources, check client roaming behavior, and verify AP health (Correct answer)

Correct answer: Correlate the timing with potential interference sources, check client roaming behavior, and verify AP health

Intermittent issues require systematic investigation: correlating occurrence times with potential interference (shift schedules, equipment usage), analyzing client roaming logs, checking AP resource utilization, and reviewing environmental changes.

Question 27: How does transmit power mismatch between APs and clients affect network performance?

It has no effect on performance
It only affects battery life on the client device
Clients may hear the AP but cannot transmit back reliably, creating asymmetric communication (Correct answer)
It causes the AP to overheat

Correct answer: Clients may hear the AP but cannot transmit back reliably, creating asymmetric communication

When an AP transmits at much higher power than the client device, the client can receive the AP's signal from far away but its lower-power response may not reach the AP, creating an asymmetric link with poor performance.

Question 28: What is the benefit of performing an active site survey?

It eliminates interference completely.
It estimates signal coverage using software models.
It provides real-time performance data. (Correct answer)
It is performed without connecting to the network.

Correct answer: It provides real-time performance data.

An active site survey involves deploying temporary access points and connecting a survey client to them to measure actual network performance. This process allows for the collection of real-time data on signal strength, data rates, throughput, and latency, providing a highly accurate assessment of how the network will perform in practice.

Question 29: What is the typical roaming latency target for seamless VoIP handoff using 802.11r?

Under 500 ms
Under 50 ms (Correct answer)
Under 150 ms
Under 10 ms

Correct answer: Under 50 ms

802.11r targets roaming latency under 50 ms to prevent audible gaps or dropped VoIP calls during AP transitions.

Question 30: What effect does each 3 dB increase in antenna gain have on the effective coverage radius (assuming free-space path loss)?

Triples the coverage radius
Has no effect on coverage radius
Doubles the coverage radius
Increases radius by approximately 41% (Correct answer)

Correct answer: Increases radius by approximately 41%

A 3 dB gain increase doubles the power density, which increases the free-space coverage radius by roughly 41%.

Question 31: Which metric does 802.11k neighbor reports NOT include about neighboring APs?

Current client count on the neighbor AP (Correct answer)
Operating channel
RSSI seen by the reporting AP
BSSID

Correct answer: Current client count on the neighbor AP

802.11k neighbor reports include BSSID, channel, and regulatory information but do not report the load or client count of neighbors.

Question 32: What is the primary purpose of a predictive site survey in WLAN design?

To measure existing wireless signal strength throughout a building
To count the number of client devices on the network
To test the speed of the current network
To model RF coverage and capacity using floor plans before deploying equipment (Correct answer)

Correct answer: To model RF coverage and capacity using floor plans before deploying equipment

Predictive site surveys use software tools to simulate RF propagation on imported floor plans, allowing designers to plan AP placement, channel assignments, and power levels before any equipment is physically installed.

Question 33: What is co-channel interference in a wireless network?

Interference from neighboring networks on different channels.
Signal loss due to long-distance coverage.
Multiple access points using the same channel. (Correct answer)
Interference caused by non-Wi-Fi devices.

Correct answer: Multiple access points using the same channel.

Co-channel interference occurs when two or more wireless access points or devices operating within the same geographical area attempt to transmit on the exact same radio frequency channel. This leads to signal collisions and retransmissions, significantly degrading network performance and throughput for all affected devices.

Question 34: What does a high percentage of management frames indicate in a wireless packet capture?

Possible network instability with frequent client associations, disassociations, or probe requests (Correct answer)
High data throughput
Encrypted traffic that cannot be analyzed
A well-optimized network

Correct answer: Possible network instability with frequent client associations, disassociations, or probe requests

A disproportionately high percentage of management frames (probe requests, authentication, association, deauthentication) suggests clients are struggling to connect or stay connected, indicating network instability.

Question 35: What is the most common cause of sticky client behavior in enterprise WLANs?

Excessive DHCP lease times
Clients maintaining association with a distant AP instead of roaming to a closer one (Correct answer)
Clients frequently disconnecting and reconnecting
Too many SSIDs configured on the network

Correct answer: Clients maintaining association with a distant AP instead of roaming to a closer one

Sticky clients occur when devices maintain their connection to the original AP even after moving to an area better served by another AP, often due to the client's roaming algorithm threshold being too conservative.

Question 36: What is the purpose of an RF antenna in a wireless network?

Transmit and receive radio waves. (Correct answer)
Increase internet speed.
Convert digital data to sound signals.
Generate electrical current.

Correct answer: Transmit and receive radio waves.

The fundamental purpose of an RF antenna in a wireless network is to convert electrical signals into radio waves for transmission, and vice versa for reception. Antennas are essential components that enable devices to send and receive data wirelessly over the air. Without them, wireless communication would not be possible.

Question 37: Which channel planning strategy assigns the same channel to APs that are sufficiently separated to prevent interference?

Dynamic Frequency Selection
Random channel assignment
Adjacent channel planning
Frequency reuse planning (Correct answer)

Correct answer: Frequency reuse planning

Frequency reuse planning deliberately reuses the same channels at APs spaced far enough apart so their coverage cells do not interfere with each other.

Question 38: Which regulatory domain restriction must a CWDP consider when deploying outdoor 5 GHz point-to-point bridges in the US?

UNII-2 and UNII-2 Extended channels require DFS radar detection and avoidance (Correct answer)
Maximum EIRP for all outdoor 5 GHz links is 20 dBm
Outdoor 5 GHz use is limited to UNII-3 channels only
All 5 GHz channels are prohibited outdoors

Correct answer: UNII-2 and UNII-2 Extended channels require DFS radar detection and avoidance

UNII-2 and UNII-2e channels in the 5 GHz band require Dynamic Frequency Selection (DFS) to detect and avoid radar interference.

Question 39: What is the difference between a passive and active site survey?

There is no difference in the data collected
Passive surveys use fewer tools than active surveys
Passive surveys are done at night; active surveys during business hours
Passive surveys listen to existing RF without associating; active surveys connect to the network and measure performance (Correct answer)

Correct answer: Passive surveys listen to existing RF without associating; active surveys connect to the network and measure performance

Passive surveys capture RF data (signal strength, noise, interference) without connecting to any network, while active surveys associate with the WLAN and measure actual throughput, latency, packet loss, and roaming behavior.

Question 40: What is the primary purpose of a wireless site survey?

To increase network bandwidth.
To determine signal strength and interference. (Correct answer)
To configure wired network infrastructure.
To install access points randomly.

Correct answer: To determine signal strength and interference.

The primary purpose of a wireless site survey is to meticulously evaluate the radio frequency (RF) environment of a specific location. This involves measuring signal strength, identifying potential sources of interference, and mapping out areas of coverage and dead zones to ensure optimal access point placement and network performance.

Question 41: In an outdoor point-to-point wireless bridge, what is the first Fresnel zone and why must it be kept clear?

The regulatory exclusion zone around outdoor APs
The line-of-sight path that must be perfectly straight
The antenna beam pattern measured at 3 dB below peak
An elliptical region around the direct path where reflections constructively interfere; obstruction causes significant signal loss (Correct answer)

Correct answer: An elliptical region around the direct path where reflections constructively interfere; obstruction causes significant signal loss

The first Fresnel zone must be at least 60% clear of obstructions to avoid destructive interference that degrades link performance.

Question 42: What is jitter in the context of VoIP over WLAN, and what is the typical acceptable maximum?

Total round-trip delay; under 150 ms
Packet loss rate; under 1%
Signal level fluctuation; under 10 dBm
Variation in packet arrival times; under 50 ms (Correct answer)

Correct answer: Variation in packet arrival times; under 50 ms

Jitter is the variance in packet inter-arrival delay; values above 50 ms cause audible distortion in VoIP calls.

Question 43: How can excessive co-channel interference (CCI) be identified during troubleshooting?

Clients unable to authenticate
DHCP server not responding
Complete loss of wireless connectivity
High retry rates and low throughput despite strong signal levels (Correct answer)

Correct answer: High retry rates and low throughput despite strong signal levels

CCI manifests as high retry/retransmission rates and degraded throughput even when clients show strong received signal strength, because multiple APs on the same channel contend for airtime.

Question 44: What is the purpose of a site survey in wireless network design?

To check internet speed at different locations.
To analyze signal strength, interference, and coverage. (Correct answer)
To reduce the need for network security measures.
To determine ISP availability.

Correct answer: To analyze signal strength, interference, and coverage.

A wireless site survey is a crucial step in designing and deploying a Wi-Fi network. Its purpose is to physically assess the environment, measuring existing RF signals, identifying sources of interference, and determining optimal access point placement to ensure adequate signal coverage and performance throughout the desired area.

Question 45: In the 802.11r fast transition process, what is the role of the 'R0 Key Holder'?

The client that initiates the roam request
The controller that manages IP address assignment
The first AP in the mobility domain that derives the master session key (Correct answer)
The RADIUS server that stores EAP credentials

Correct answer: The first AP in the mobility domain that derives the master session key

The R0 Key Holder (typically the original authenticating AP or controller) holds the top-level PMK-R0 from which all roaming keys are derived.

Question 46: Which video streaming protocol benefit most from WMM AC_VI (Video) prioritization over WLAN?

Background OS updates
Real-time conferencing using RTP video streams (Correct answer)
FTP file transfers
SNMP management traffic

Correct answer: Real-time conferencing using RTP video streams

RTP-based video conferencing is delay-sensitive and benefits from AC_VI's higher priority and shorter contention windows.

Question 47: What WMM feature specifically helps VoIP handsets conserve battery while maintaining low latency?

U-APSD (Unscheduled Automatic Power Save Delivery) (Correct answer)
EDCA
TXOP bursting
Block ACK

Correct answer: U-APSD (Unscheduled Automatic Power Save Delivery)

U-APSD allows clients to trigger buffered delivery from the AP at will, balancing power savings with low-latency delivery.

Question 48: What is Adjacent Channel Interference (ACI) in wireless networking?

Interference from external RF sources outside the building
Interference between APs on channels that partially overlap in frequency (Correct answer)
Interference caused by the same SSID broadcasted on multiple APs
Interference between APs using identical channels

Correct answer: Interference between APs on channels that partially overlap in frequency

ACI occurs when APs use channels that are close but not identical in frequency, causing partial spectral overlap that degrades signal quality.

Question 49: Which polarization mismatch scenario results in the greatest signal loss?

One vertical and one horizontal polarization (Correct answer)
Cross-polarized MIMO antennas
Both antennas horizontally polarized
Both antennas vertically polarized

Correct answer: One vertical and one horizontal polarization

A 90-degree polarization mismatch between transmitter and receiver can cause up to 20 dB of signal loss.

Question 50: What minimum RSSI delta between the current AP and a candidate AP typically triggers a client roam decision?

20 dB
5 dB (Correct answer)
2 dB
12 dB

Correct answer: 5 dB

Most clients require at least a 5 dB RSSI improvement at the target AP before initiating a roam to avoid unnecessary thrashing.

Question 51: A CWDP is designing a hospital WLAN for VoIP over Wi-Fi phones. Which frequency band should be preferred and why?

6 GHz only, as 5 GHz is prohibited in medical facilities
5 GHz for more non-overlapping channels and less interference (Correct answer)
2.4 GHz for better range and penetration
Dual-band simultaneously on both 2.4 and 5 GHz

Correct answer: 5 GHz for more non-overlapping channels and less interference

5 GHz provides more non-overlapping channels (up to 25 in the US), reducing co-channel interference in dense deployments.

Question 52: What does 'antenna gain' measure in the context of WLAN design?

Total power output of the access point
Amplification of the transmit power
Concentration of radiated energy in a specific direction (Correct answer)
Signal attenuation across free space

Correct answer: Concentration of radiated energy in a specific direction

Antenna gain measures how much energy is focused in a particular direction compared to a reference antenna.

Question 53: How does 802.11k (neighbor reports) assist in VoWLAN deployments?

It assigns dedicated channels for voice traffic
It encrypts voice frames end-to-end
It provides clients with a list of neighboring APs to speed up roaming decisions (Correct answer)
It compresses voice codec payloads

Correct answer: It provides clients with a list of neighboring APs to speed up roaming decisions

802.11k neighbor reports allow clients to quickly identify candidate APs for roaming, reducing handoff latency for active voice calls.

Question 54: Which deployment strategy helps optimize coverage in a high-density wireless environment?

Disabling 5 GHz band for better range.
Using more access points with smaller coverage cells. (Correct answer)
Ignoring interference sources.
Deploying a single high-powered access point.

Correct answer: Using more access points with smaller coverage cells.

In high-density environments, deploying more access points with reduced transmit power creates smaller, overlapping coverage cells. This strategy allows for better client load balancing across multiple APs and minimizes co-channel interference by enabling more efficient channel reuse, thereby optimizing overall network capacity and performance.

Question 55: Which factor should be considered when deploying access points in an outdoor wireless network?

Only signal strength and SSID names.
The number of available Wi-Fi channels.
The presence of mobile devices in the area.
Weather conditions, power availability, and obstacles. (Correct answer)

Correct answer: Weather conditions, power availability, and obstacles.

Outdoor wireless deployments face unique environmental challenges. Weather conditions (rain, snow, extreme temperatures) necessitate ruggedized equipment, while power availability can be limited, requiring careful planning for power over Ethernet (PoE) or alternative solutions. Physical obstacles like trees, buildings, and terrain can also block or reflect signals, demanding meticulous planning for line-of-sight and signal propagation.

Question 56: What is a mobility domain in the context of 802.11r fast BSS transition?

A group of APs sharing the same SSID and 802.11r configuration that allow fast roaming between them (Correct answer)
The IP subnet assigned to mobile clients
A controller cluster sharing client databases
The physical area covered by a single AP's signal

Correct answer: A group of APs sharing the same SSID and 802.11r configuration that allow fast roaming between them

An 802.11r mobility domain is identified by a Mobility Domain ID (MDID) shared among APs that support fast transitions between them.

Question 57: What is the primary goal of channel planning in a WLAN deployment?

Reduce the total number of SSIDs broadcasted
Maximize the number of access points deployed
Increase transmit power across all access points
Minimize co-channel interference between access points (Correct answer)

Correct answer: Minimize co-channel interference between access points

Channel planning aims to minimize co-channel interference by ensuring APs using the same channel are spaced far enough apart that their signals do not significantly overlap.

Question 58: Which environmental factor causes the most significant signal attenuation for outdoor 5 GHz links during adverse weather?

Heavy rain causing rain fade above 10 GHz
High humidity at ground level
Direct sunlight on antennas
Wind causing antenna misalignment (Correct answer)

Correct answer: Wind causing antenna misalignment

Wind-induced antenna sway causes misalignment of high-gain directional antennas, significantly degrading narrow-beam outdoor links.

Question 59: What is the primary advantage of MU-MIMO over SU-MIMO in wireless network design?

It provides longer range for individual clients
It eliminates the need for multiple antennas
It allows the AP to communicate with multiple clients simultaneously (Correct answer)
It uses less power than SU-MIMO

Correct answer: It allows the AP to communicate with multiple clients simultaneously

Multi-User MIMO allows an access point to transmit to or receive from multiple clients at the same time using spatial multiplexing, significantly improving network capacity in dense environments.

Question 60: In a high-density VoWLAN deployment, what call admission control (CAC) mechanism prevents AP oversubscription?

Using TSPEC-based admission control defined in 802.11e (Correct answer)
Limiting maximum associations per AP
Disabling WMM on voice SSIDs
Assigning all VoIP to 2.4 GHz only

Correct answer: Using TSPEC-based admission control defined in 802.11e

TSPEC (Traffic Specification) admission control allows the AP to accept or reject new voice streams based on available bandwidth.

Certified Wireless Design Professional (CWDP-305)

The CWDP-305 exam validates the knowledge and skills required to manage all stages of the Wi-Fi WLAN design life cycle, including defining specifications, designing, deploying, validating, and optimizing wireless networks. Candidates must hold a valid CWNA certification to earn the CWDP credential.

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