View Full Cisco CCNP Wireless 350-101 Exam Dumps and Practice Test Dumps

 

Question 381: During troubleshooting, an AP is unable to discover or join the wireless LAN controller. Which configuration should be checked first when the AP receives its IP address through DHCP?

1. WMM policy
2. RF Profile assignment
3. DHCP Option 43 or DNS-based controller discovery
4. Client exclusion list

Correct Answer: 3. DHCP Option 43 or DNS-based controller discovery

Explanation:
An AP must discover a wireless LAN controller before it can establish a CAPWAP session and join the controller. When the AP receives an IP address through DHCP, DHCP Option 43 can provide controller discovery information. DNS-based discovery can also be used when the appropriate controller hostname is configured. If discovery information is incorrect or unavailable, the AP may obtain network connectivity but still fail to locate a controller. RF Profiles, WMM policies, and client exclusion settings do not provide the initial controller discovery mechanism. Therefore, DHCP Option 43 or DNS-based discovery should be examined when troubleshooting an AP that cannot locate its controller.

Question 382: Which CAPWAP port is used for the data channel between a lightweight AP and a Cisco wireless LAN controller?

1. UDP 5247
2. UDP 5246
3. TCP 5247
4. TCP 5246

Correct Answer: 1. UDP 5247

Explanation:
CAPWAP separates control and data traffic into different UDP channels. UDP 5246 is used for CAPWAP control traffic, while UDP 5247 is used for CAPWAP data traffic. The control channel carries management information required to establish and maintain the AP-controller relationship, whereas the data channel carries wireless client traffic when the deployment uses centralized data forwarding. CAPWAP uses UDP rather than TCP for these channels. Understanding the distinction between UDP 5246 and UDP 5247 is important when troubleshooting firewalls, ACLs, and network connectivity between lightweight APs and controllers.

Question 383: An administrator needs to place users from different WLANs into different VLANs dynamically based on their authentication credentials. Which capability should be configured?

1. CleanAir
2. Dynamic Channel Assignment
3. Client Exclusion
4. Dynamic VLAN assignment using AAA attributes

Correct Answer: 4. Dynamic VLAN assignment using AAA attributes

Explanation:
Dynamic VLAN assignment allows a network to place authenticated wireless clients into different VLANs according to attributes returned by an AAA server. In an 802.1X deployment, the RADIUS server can return VLAN-related attributes that instruct the wireless infrastructure which VLAN should be assigned to the authenticated client. This approach allows different users or groups to receive different network access without requiring separate WLANs for every user category. CleanAir addresses RF interference, Dynamic Channel Assignment manages RF channel selection, and Client Exclusion controls problematic client behavior. AAA-based dynamic VLAN assignment is therefore the appropriate solution.

Question 384: What is the primary purpose of DHCP Proxy on a Cisco wireless LAN controller?

1. To assign RF channels to access points
2. To relay DHCP requests between wireless clients and the DHCP server
3. To authenticate wireless clients using certificates
4. To encrypt CAPWAP data traffic

Correct Answer: 2. To relay DHCP requests between wireless clients and the DHCP server

Explanation:
DHCP Proxy on a Cisco wireless LAN controller assists with forwarding DHCP requests between wireless clients and DHCP servers. The controller can receive a client’s DHCP request and forward it toward the appropriate DHCP server, then return the server’s response to the client. This functionality helps wireless clients obtain network configuration such as an IP address, subnet mask, gateway, and DNS information. DHCP Proxy does not perform RF channel management, certificate-based authentication, or CAPWAP encryption. Understanding DHCP behavior is particularly important when troubleshooting clients that associate successfully with an AP but fail to obtain valid IP addressing.

Question 385: Which component acts as the supplicant in an 802.1X wireless authentication process?

1. The wireless client
2. The RADIUS server
3. The wireless LAN controller
4. The access point’s RF radio

Correct Answer: 1. The wireless client

Explanation:
In an 802.1X architecture, the supplicant is the endpoint requesting network access. In a wireless environment, this role is normally performed by the wireless client. The authenticator, typically represented by the AP or controller depending on the architecture, controls access to the network and relays authentication information. The RADIUS server acts as the authentication server and validates the client’s credentials through the selected EAP method. Understanding these three roles—supplicant, authenticator, and authentication server—is fundamental when troubleshooting enterprise wireless authentication failures.

Question 386: Which RADIUS function provides information about the start and stop of a user’s network session for accounting purposes?

1. Access-Request
2. Access-Reject
3. Access-Accept
4. Accounting-Start and Accounting-Stop

Correct Answer: 4. Accounting-Start and Accounting-Stop

Explanation:
RADIUS accounting provides information about user sessions for monitoring, auditing, and usage tracking. Accounting-Start records the beginning of a session, while Accounting-Stop records its termination and can include information such as session duration and traffic statistics. Access-Request, Access-Accept, and Access-Reject are associated primarily with authentication and authorization rather than session accounting. In enterprise wireless environments, RADIUS accounting can help administrators correlate authentication activity with user sessions and investigate access or usage records. Therefore, Accounting-Start and Accounting-Stop messages provide the session lifecycle information required for RADIUS accounting.

Question 387: Which Cisco wireless feature allows a controller to use different radio settings for different deployment areas?

1. RF Profiles
2. Client Exclusion
3. DHCP Proxy
4. Web Authentication

Correct Answer: 1. RF Profiles

Explanation:
RF Profiles allow administrators to apply a collection of radio-frequency settings to access points or AP groups according to deployment requirements. Different environments may require different channel widths, transmit power limits, data rates, or other RF parameters. For example, a high-density area may require more conservative channel planning than a low-density office environment. RF Profiles provide a structured method for applying these settings consistently to appropriate APs. Client Exclusion deals with problematic clients, DHCP Proxy handles DHCP forwarding, and Web Authentication provides an authentication mechanism. RF Profiles are therefore the appropriate feature for area-specific RF configuration.

Question 388: A guest user must authenticate through a web page before receiving normal network access. Which wireless security feature provides this functionality?

1. 802.11k
2. CleanAir
3. Web Authentication
4. Dynamic Channel Assignment

Correct Answer: 3. Web Authentication

Explanation:
Web Authentication provides a browser-based authentication mechanism commonly used for guest WLANs and other environments where users must accept terms or provide credentials through a web portal. A client can associate with the WLAN and receive limited access before being redirected to the authentication page. After successful authentication, the appropriate network access can be granted according to the configured policy. 802.11k assists with radio measurements and roaming, CleanAir addresses RF interference visibility, and Dynamic Channel Assignment manages channel selection. Therefore, Web Authentication is the feature directly associated with browser-based guest access.

Question 389: Which Cisco wireless capability provides centralized visibility into client health, connectivity, and wireless performance trends?

1. Wireless Assurance
2. CAPWAP Discovery
3. DHCP Proxy
4. Dynamic VLAN Assignment

Correct Answer: 1. Wireless Assurance

Explanation:
Wireless Assurance provides analytics and visibility into wireless client and network performance. It can help administrators examine information related to connectivity, client experience, device health, RF conditions, and historical performance trends. This type of visibility can be useful for identifying recurring problems that may not be obvious from a single device or isolated event. CAPWAP Discovery is associated with AP-controller discovery, DHCP Proxy handles DHCP forwarding, and Dynamic VLAN Assignment controls client VLAN placement. Wireless Assurance is therefore the capability most directly associated with centralized analytics and operational visibility for wireless networks.

Question 390: In a Cisco wireless network, what is the primary purpose of a Mobility Group?

1. To allow controllers to share client mobility information for roaming
2. To assign VLANs dynamically through RADIUS
3. To select the best RF channel automatically
4. To detect spectrum interference

Correct Answer: 1. To allow controllers to share client mobility information for roaming

Explanation:
A Mobility Group allows multiple Cisco wireless LAN controllers to participate in a common mobility domain and exchange information required to support client roaming between controllers. Mobility relationships help maintain client connectivity as users move between APs that are managed by different controllers. This is particularly important in larger wireless deployments where a client may travel across controller boundaries. Dynamic VLAN assignment is an AAA function, channel selection is handled by RF management mechanisms such as DCA, and interference detection is associated with tools such as CleanAir. Mobility Groups therefore support controller-to-controller client mobility.

Question 391: Which Cisco feature is specifically designed to optimize multicast traffic delivery over a wireless network?

1. Multicast optimization
2. 802.11k Neighbor Reports
3. Client Exclusion
4. RF Profile

Correct Answer: 1. Multicast optimization

Explanation:
Multicast optimization can improve the efficiency of multicast delivery over wireless networks by reducing the impact of multicast traffic on wireless airtime. Wireless multicast frames can consume significant airtime because they may be transmitted using rates that provide reliable coverage rather than the highest available unicast rates. Optimizing multicast behavior can therefore help reduce unnecessary airtime consumption and improve overall WLAN efficiency. 802.11k assists with neighbor information, Client Exclusion addresses problematic clients, and RF Profiles define radio settings. Multicast optimization is consequently the feature directly associated with improving multicast traffic handling.

Question 392: Which RF measurement compares the strength of a received wireless signal with the surrounding noise level?

1. RSSI
2. Channel utilization
3. SNR
4. EIRP

Correct Answer: 3. SNR

Explanation:
Signal-to-Noise Ratio, or SNR, represents the relationship between the received signal strength and the background noise level. A higher SNR generally provides better conditions for reliable wireless communication because the desired signal is more clearly distinguishable from noise. RSSI represents a measurement of received signal strength, but it does not directly describe the relationship between signal and noise. Channel utilization indicates how much airtime is being used, while EIRP describes effective radiated transmit power. When troubleshooting wireless quality and determining whether the signal is sufficiently above the noise floor, SNR is therefore a particularly important measurement.

Question 393: What is the main purpose of Cisco CleanAir technology?

1. To identify and help mitigate non-Wi-Fi RF interference
2. To assign IP addresses to wireless clients
3. To perform RADIUS authentication
4. To provide CAPWAP encryption

Correct Answer: 1. To identify and help mitigate non-Wi-Fi RF interference

Explanation:
Cisco CleanAir is designed to detect, classify, and provide visibility into RF interference, including interference generated by devices that do not use standard Wi-Fi protocols. Examples can include certain wireless video devices, microwave sources, cordless technologies, and other RF emitters. By identifying interference sources and providing information about their impact, CleanAir can help administrators troubleshoot degraded wireless performance and make informed RF-management decisions. CleanAir does not perform client IP addressing, RADIUS authentication, or CAPWAP encryption. Its primary role is therefore RF-spectrum visibility and interference identification.

Question 394: In a high-density 5 GHz deployment, why can using very wide channels reduce available capacity?

1. Wide channels prevent clients from using 802.11ax
2. Wide channels consume more spectrum and reduce the number of non-overlapping channels available for reuse
3. Wide channels disable WPA3 authentication
4. Wide channels eliminate the need for transmit-power planning

Correct Answer: 2. Wide channels consume more spectrum and reduce the number of non-overlapping channels available for reuse

Explanation:
Wide channel configurations combine multiple adjacent 20-MHz channels into larger channel widths. Although wider channels can increase the theoretical throughput of an individual client under suitable conditions, they also consume more RF spectrum. In a high-density environment, this can reduce the number of distinct channels available for spatial reuse and increase co-channel contention between nearby APs. Careful channel-width selection is therefore an important part of capacity planning. Wide channels do not inherently disable modern wireless security or 802.11ax capabilities, nor do they remove the need for transmit-power and RF planning.

Question 395: Which Cisco RRM function primarily determines the transmit power level of an access point radio?

1. Dynamic Transmit Power Control
2. Dynamic Channel Assignment
3. CleanAir
4. Client Exclusion

Correct Answer: 1. Dynamic Transmit Power Control

Explanation:
Dynamic Transmit Power Control, commonly associated with RRM, determines suitable transmit-power levels for access point radios based on RF conditions and the configured wireless design. Adjusting transmit power can help maintain appropriate coverage while limiting excessive cell overlap and unnecessary co-channel contention. Dynamic Channel Assignment focuses on selecting suitable RF channels rather than transmit power. CleanAir provides interference detection and spectrum visibility, while Client Exclusion can restrict problematic clients. DTP-related RRM decisions are therefore important for maintaining an appropriate RF cell size and supporting efficient wireless coverage.

Question 396: Which wireless technology allows an AP and client to exchange information about neighboring access points to assist roaming decisions?

1. 802.11v BSS Transition Management
2. 802.11w Protected Management Frames
3. 802.11k Neighbor Reports
4. 802.11r Fast Transition

Correct Answer: 3. 802.11k Neighbor Reports

Explanation:
802.11k provides mechanisms for a wireless client to obtain information about neighboring APs and their radio characteristics. Neighbor Reports can help a capable client identify suitable candidate APs without having to perform a full scan of every possible channel. This can reduce scanning overhead and improve roaming efficiency, particularly in enterprise environments. 802.11r focuses on fast authentication during roaming, while 802.11v provides network-assisted BSS transition management. 802.11w protects certain management frames. Therefore, 802.11k Neighbor Reports are the feature specifically associated with providing neighboring AP information.

Question 397: A wireless client has excellent RSSI but experiences low throughput and frequent retransmissions. Which condition should be investigated first?

1. High channel utilization or RF interference
2. DHCP Option 43
3. RADIUS accounting
4. DNS controller discovery

Correct Answer: 1. High channel utilization or RF interference

Explanation:
Strong RSSI does not guarantee good wireless performance. A client can have an excellent received signal while still experiencing poor throughput because of high channel utilization, co-channel contention, adjacent-channel interference, or other RF problems. Retransmissions are a useful indicator that frames are not being delivered efficiently. Administrators should therefore examine channel utilization, interference levels, noise, retry rates, and related RF statistics. DHCP Option 43 and DNS discovery are primarily involved in AP-controller discovery, while RADIUS accounting records sessions. When strong RSSI exists alongside poor throughput and retransmissions, RF conditions should be investigated.

Question 398: What is the primary purpose of 802.11v BSS Transition Management?

1. To provide WPA3 encryption
2. To provide neighbor RF measurements
3. To protect management frames
4. To allow the network to suggest that a client transition to a different BSS

Correct Answer: 4. To allow the network to suggest that a client transition to a different BSS

Explanation:
802.11v BSS Transition Management provides mechanisms that allow the wireless infrastructure to communicate with capable clients about potential BSS transitions. The network can provide transition suggestions or candidate information to help a client move toward a more suitable AP. This can be useful for load distribution, coverage optimization, and roaming assistance. The client ultimately participates in the roaming decision and support varies by client implementation. 802.11k is associated with neighbor measurements, 802.11w protects management frames, and WPA3 provides wireless security. Therefore, BSS Transition Management is the function associated with assisting clients in selecting another BSS.

Question 399: Which measurement is most useful for determining whether a wireless signal is sufficiently above the RF noise floor?

1. SNR
2. BSSID
3. VLAN ID
4. DHCP lease time

Correct Answer: 1. SNR

Explanation:
SNR, or Signal-to-Noise Ratio, indicates how much stronger the desired wireless signal is compared with the surrounding noise floor. This makes it particularly useful when evaluating whether RF conditions are suitable for reliable communication. A strong RSSI value by itself does not necessarily indicate good quality because the noise level could also be high. BSSID identifies a wireless network interface, while VLAN IDs and DHCP lease times relate to network configuration rather than RF quality. During wireless troubleshooting and site surveys, SNR can therefore provide valuable insight into the quality and reliability of the RF environment.

Question 400: In a high-density wireless environment, which design approach generally helps improve capacity?

1. Use maximum transmit power on every AP
2. Use appropriate channel reuse, smaller cells, and sufficient AP density
3. Configure every AP to use the widest available channel
4. Disable all RF management features

Correct Answer: 2. Use appropriate channel reuse, smaller cells, and sufficient AP density

Explanation:
High-density wireless environments require capacity-focused RF planning rather than simply maximizing coverage. Appropriate channel reuse, carefully controlled cell sizes, and sufficient AP density can increase the amount of available airtime and allow more clients to be served efficiently. Excessive transmit power can enlarge cells unnecessarily and increase co-channel contention. Using the widest available channels everywhere can also reduce the number of channels available for reuse. RF management should not be disabled because dynamic optimization can provide useful assistance when properly configured. Therefore, a carefully engineered combination of channel reuse, cell sizing, and AP density is important for high-density capacity planning.