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Question 221.

Which roaming method allows a client to use a cached PMK?

1. Opportunistic Key Caching
2. Dynamic Frequency Selection
3. Protected Management Frames
4. Channel Switch Announcement

Correct Answer: 1

Explanation:

Opportunistic Key Caching (OKC) allows a wireless client to reuse previously derived keying material when moving between access points that share the same WLAN security context. This can reduce authentication delay because the client does not need to perform a complete authentication exchange for every AP transition. OKC is particularly useful in environments where fast roaming is important but a full 802.11r deployment is not being used. The WLAN infrastructure must support the appropriate caching mechanism for the technique to function correctly.

Question 222.

What does a PMKID primarily identify in enterprise Wi-Fi?

1. Radio operating channel
2. Cached master key
3. Client antenna type
4. Access-point transmit power

Correct Answer: 2

Explanation:

A PMKID identifies a particular Pairwise Master Key within a wireless security context. During authentication and roaming procedures, the identifier can help the client and network determine whether previously established keying material can be reused. This can reduce authentication overhead during subsequent connections. PMKIDs are especially relevant when designing secure roaming behavior because they connect authentication state with the corresponding master key material. They do not describe RF characteristics such as channel, antenna configuration, or transmit power.

Question 223.

Which 802.11r approach exchanges fast-transition messages directly with the AP?

1. Fast BSS Transition
2. Fast Transition over-the-DS
3. Fast Transition over-the-Air
4. Protected Association Exchange

Correct Answer: 3

Explanation:

Fast Transition over-the-Air allows a client to exchange 802.11r fast-transition messages directly with the target access point through the wireless medium. This approach is useful when the client is preparing to move to a neighboring AP and needs a streamlined authentication process. In contrast, the over-the-DS method uses the distribution system for communication with the target AP. Choosing between these mechanisms depends on WLAN infrastructure behavior, client compatibility, and roaming requirements. Proper validation is important because not every client handles fast-transition features identically.

Question 224.

Why might a designer define a minimum RSSI roaming threshold?

1. To increase beacon intervals
2. To force wider channels
3. To reduce authentication security
4. To encourage earlier reassociation

Correct Answer: 4

Explanation:

A minimum RSSI roaming threshold can encourage clients to leave an AP before their connection becomes excessively weak. This can improve mobility performance when clients tend to remain associated with a distant AP despite having a stronger neighboring AP available. The threshold itself does not guarantee roaming because many roaming decisions remain client controlled. Designers should therefore validate client behavior during movement tests. An excessively aggressive threshold can also cause unnecessary reassociations, so the selected value should reflect application requirements, cell design, and observed client behavior.

Question 225.

What can deauthentication do to an associated wireless client?

1. End its current association
2. Increase its PHY rate
3. Improve antenna gain
4. Expand its coverage area

Correct Answer: 1

Explanation:

A deauthentication frame terminates the authenticated relationship between a wireless client and the access point. After receiving or otherwise processing the deauthentication event, the client must establish authentication again before normal protected WLAN communication can continue. Deauthentication can occur for legitimate operational reasons, but unexpected events may also indicate configuration problems or malicious activity. During WLAN troubleshooting, repeated unexplained deauthentication events should therefore be investigated rather than automatically attributed to weak coverage. Authentication logs, wireless controller records, and client diagnostics can help determine the underlying cause.

Question 226.

Which design feature most directly improves WLAN availability during controller failure?

1. Higher antenna gain
2. Controller redundancy
3. Narrower channel widths
4. Lower beacon power

Correct Answer: 2

Explanation:

Controller redundancy provides an alternate control-plane resource when the primary WLAN controller becomes unavailable. Depending on the architecture, APs may maintain service, establish control connections with a standby controller, or use another defined failover mechanism. The exact behavior depends on the vendor platform and deployment model. High-availability planning should include failure scenarios, synchronization requirements, and recovery timing. Merely increasing RF coverage does not address a controller outage. A wireless design should evaluate infrastructure redundancy as part of overall service availability rather than treating RF coverage as the only availability factor.

Question 227.

What is a key reason to verify AP licensing before deployment?

1. It determines antenna polarization
2. It controls wall attenuation
3. It confirms required device entitlements
4. It changes client sensitivity

Correct Answer: 3

Explanation:

AP licensing requirements should be verified before deployment because many enterprise WLAN platforms require specific software or subscription entitlements for AP operation and management. A design can contain adequate RF coverage and switching capacity yet still fail operationally if the necessary licenses are unavailable. Licensing may also affect enabled features, management capacity, or support status. During planning, the designer should document the expected AP count, software version, license model, and feature requirements. This prevents an infrastructure-ready deployment from being delayed by administrative or platform entitlement issues.

Question 228.

Why is local switching useful in some controller-based WLAN designs?

1. It keeps traffic at the AP site
2. It eliminates wireless authentication
3. It increases antenna beamwidth
4. It removes Ethernet requirements

Correct Answer: 1

Explanation:

Local switching allows certain client traffic to exit the WLAN infrastructure near the access point rather than being tunneled back through a centralized controller. This can reduce unnecessary traffic across WAN links and may be useful for branch or distributed deployments. The design still requires appropriate authentication, security, VLAN, and policy handling. Local switching is therefore an architectural choice rather than a replacement for WLAN security. Designers should determine which traffic should remain local and which traffic must traverse centralized security or policy enforcement points.

Question 229.

What is split tunneling intended to control?

1. Antenna radiation pattern
2. Traffic forwarding paths
3. RF channel spacing
4. Client receiver gain

Correct Answer: 3

Explanation:

Split tunneling controls how different categories of network traffic are forwarded. In a WLAN or remote-access architecture, selected traffic can use a local path while other traffic continues through a centralized tunnel or security service. This can improve WAN efficiency but must be designed carefully because security inspection and policy enforcement may differ between paths. The designer should explicitly identify which destinations use each forwarding route. Split tunneling therefore concerns traffic architecture rather than RF characteristics such as channel spacing, antenna patterns, or receiver performance.

Question 230.

Which metric helps determine whether an AP’s wired connection is constraining WLAN performance?

1. Antenna gain
2. Channel center frequency
3. Ethernet link utilization
4. Polarization angle

Correct Answer: 4

Explanation:

Ethernet link utilization helps reveal whether the wired connection supporting an access point is becoming a bottleneck. A WLAN may provide substantial aggregate wireless capacity while the AP’s Ethernet interface or upstream network remains constrained. Designers should compare wireless traffic demand with switch-port speed, uplink capacity, and observed utilization. This is especially important for high-density or high-throughput deployments. Monitoring the wired path can distinguish RF limitations from network-side constraints, preventing unnecessary radio changes when the actual limitation exists beyond the wireless medium.

Question 231.

Which Ethernet cable category is commonly selected for modern multi-gigabit AP connections?

1. Cat6
2. Cat3
3. Cat5
4. Cat1

Correct Answer: 1

Explanation:

Cat6 cabling is commonly used for modern enterprise access-point connections because it supports higher-frequency signaling than older categories and can accommodate multi-gigabit Ethernet deployments under appropriate installation conditions. The actual cable choice should still consider the required data rate, installation distance, environmental conditions, and applicable standards. A wireless designer should coordinate cabling requirements with the switching and structured-cabling teams. Selecting an adequate category helps prevent the wired infrastructure from limiting the performance expected from newer high-capacity access points.

Question 232.

What is a primary purpose of bonding outdoor wireless equipment?

1. Improve channel reuse
2. Provide an equipotential path
3. Increase client sensitivity
4. Reduce beacon traffic

Correct Answer: 2

Explanation:

Bonding outdoor wireless equipment helps establish an equipotential electrical path between relevant conductive components. This is important for electrical safety and for reducing damaging potential differences during transient events. Outdoor APs, antennas, mounting structures, and associated conductive components should be evaluated according to applicable electrical and installation requirements. Bonding does not improve RF sensitivity or channel reuse directly. Instead, it forms part of the physical infrastructure protection strategy. Proper bonding should be coordinated with qualified electrical and facilities personnel when designing outdoor wireless installations.

Question 233.

Which environmental rating is especially relevant for an outdoor AP enclosure?

1. VLAN classification
2. DHCP lease duration
3. Ingress protection
4. Authentication timeout

Correct Answer: 3

Explanation:

Ingress protection, commonly expressed through an IP rating, indicates the enclosure’s resistance to intrusion from solids and liquids. Outdoor wireless equipment can be exposed to rain, dust, moisture, and other environmental conditions that are uncommon in controlled indoor spaces. Selecting equipment with an appropriate enclosure rating helps maintain reliable operation under the expected installation environment. The required rating depends on the deployment location and environmental exposure. Network parameters such as VLAN assignment or DHCP timing do not determine whether an enclosure can physically withstand outdoor conditions.

Question 234.

Why should an outdoor AP’s operating temperature range be checked?

1. To select SSID names
2. To change channel numbering
3. To validate environmental suitability
4. To calculate client density

Correct Answer: 3

Explanation:

The operating temperature range confirms whether an access point is designed to function reliably under the temperatures expected at its installation location. Outdoor equipment may experience substantial temperature variation, direct sunlight, or seasonal extremes that differ considerably from indoor conditions. If the environmental range is exceeded, component reliability and performance can be affected. The designer should compare manufacturer specifications with the actual site environment and consider enclosure conditions when applicable. Temperature specifications therefore form an important part of physical deployment validation, separate from RF planning parameters.

Question 235.

Which antenna characteristic describes its horizontal pointing direction?

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

Correct Answer: 1

Explanation:

Azimuth describes the horizontal direction in which an antenna is oriented. During directional-antenna deployment, documenting the intended azimuth helps ensure that the antenna’s main radiation pattern is aimed toward the required coverage area. Azimuth should be considered alongside elevation, mounting position, and antenna radiation characteristics. Incorrect orientation can shift the coverage area away from the design target and may create unexpected signal levels elsewhere. Recording the physical orientation during installation also makes later troubleshooting and maintenance more consistent with the original wireless design.

Question 236.

What does MU-MIMO allow an AP to improve?

1. Cable shielding
2. Simultaneous spatial transmissions
3. Channel encryption strength
4. Antenna mounting height

Correct Answer: 2

Explanation:

MU-MIMO allows an access point to communicate with multiple compatible clients using separate spatial streams under supported conditions. This can improve radio resource utilization compared with serving clients strictly one at a time, particularly when client and AP capabilities align with the technology. The actual benefit depends on client support, spatial-stream availability, channel conditions, and traffic characteristics. MU-MIMO does not increase encryption strength or change physical mounting requirements. Designers should therefore evaluate client capabilities and traffic patterns before assuming that enabling the feature will automatically produce a measurable capacity improvement.

Question 237.

Which security method uses certificates for client authentication?

1. WPA-Personal
2. Open authentication
3. EAP-TLS
4. Shared-key WEP

Correct Answer: 3

Explanation:

EAP-TLS uses digital certificates for mutual authentication between the wireless client and authentication infrastructure. In enterprise WLANs, this approach can provide strong identity verification without relying on a shared password for every user. A successful deployment requires certificate lifecycle management, trusted certificate authorities, appropriate client configuration, and compatible authentication servers. The operational design should account for certificate enrollment, renewal, expiration, and revocation. These management requirements are important because certificate-based authentication depends not only on the WLAN configuration but also on the supporting public-key infrastructure.

Question 238.

What should a WLAN ACL primarily define?

1. Permitted network traffic
2. Antenna beamwidth
3. RF fade margin
4. Channel bandwidth

Correct Answer: 1

Explanation:

A WLAN access control list defines which network traffic is permitted or denied according to configured rules. ACLs can help enforce segmentation and access policies after a wireless client has connected to the network. Rules may consider addresses, protocols, ports, or other supported traffic attributes. They should be designed consistently with broader firewall and network-security policies. An ACL does not control antenna characteristics or radio propagation. In a wireless design, the ACL should therefore be treated as a logical security control that complements authentication and network segmentation.

Question 239.

What is a useful first step when troubleshooting unexplained RF interference?

1. Replace every AP
2. Disable all WLAN security
3. Identify the affected frequency range
4. Increase every AP’s power

Correct Answer: 3

Explanation:

Identifying the affected frequency range helps narrow the investigation before making configuration changes. A spectrum-analysis approach can determine whether the interference is concentrated in a particular portion of the band and whether it is persistent, intermittent, narrowband, or broadband. Once the frequency characteristics are understood, the engineer can investigate likely sources and evaluate mitigation options. Randomly replacing APs or increasing transmit power can obscure the actual problem and may worsen RF conditions. A structured interference investigation should therefore begin with measurement and characterization rather than immediate configuration changes.

Question 240.

After relocating an AP, what should be compared with the original design?

1. Employee usernames
2. Updated RF measurements
3. Certificate serial numbers
4. Switch administrator names

Correct Answer: 4

Explanation:

Updated RF measurements should be compared with the original design expectations after an access point is relocated. This helps determine whether the physical change produced the intended coverage and performance improvements without creating new deficiencies. Relevant measurements may include signal levels, noise conditions, channel behavior, and application performance depending on the design objectives. A before-and-after comparison provides evidence for the change rather than relying solely on assumptions. The results should also be documented so future troubleshooting and optimization efforts have a clear reference point.