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300-110 Exam Prep Guide: Prep guide for the 300-110 Exam
NEW QUESTION # 43
An engineer is estimating the loss between two floors of an office building. Using Ekahau, they have measured -45 dBm at the ground level of the floor with the access point and -50 dBm at the ceiling level of the floor below it. Which value is the loss of the floor?
- A. -95 dB
- B. 5 dB
- C. -5 dB
- D. 95 dB
Answer: B
Explanation:
Floor loss calculation is a fundamental skill in multi-floor wireless site survey methodology. The floor attenuation value represents the signal power reduction caused by penetrating through a single floor structure including the floor decking, subfloor, ceiling material, plenum space, and any structural elements. In this measurement scenario, the engineer has two data points: -45 dBm measured at the ground level of the floor containing the access point (the signal level just below the AP ' s floor) and -50 dBm measured at the ceiling level of the floor below (the signal level just after passing through the floor structure). The floor loss is simply the difference between these two measurements: (-45 dBm) - (-50 dBm) = -45 + 50 = 5 dB. The result is expressed as a positive value (5 dB) representing attenuation - signal power decreases by 5 dB when passing through the floor. Expressing it as -5 dB (Option B) would incorrectly imply a signal gain. The 95 dB values (Options A and D) result from incorrectly adding rather than subtracting the dBm values - a common error when working with negative dBm figures. This floor attenuation value (5 dB) would then be entered into Ekahau ' s floor material properties to improve predictive model accuracy. Reference: WLSD Study Guide - Multi-Floor Signal Propagation, Floor Attenuation Factor (FAF), Ekahau Floor Loss Measurement Methodology.
NEW QUESTION # 44
A school deploys a Cisco wireless infrastructure in its classrooms to support a high density of mobile devices.
The network administrator wants to bond channels in groups of two and only allow APs to send 802.11 management frames at 24 Mbps. What should be included in the design to accomplish this objective?
- A. Set the channel width for 802.11b to 40 MHz and set data rates to 24 Mbps and Supported.
- B. Set the channel width for 802.11a to 40 MHz and set data rates to 24 Mbps and Supported.
- C. Set the channel width for 802.11b to 40 MHz and set data rates to 24 Mbps and Mandatory.
- D. Set the channel width for 802.11a to 40 MHz and set data rates to 24 Mbps and Mandatory.
Answer: D
Explanation:
For a high-density classroom deployment using 5 GHz with channel bonding in groups of two (40 MHz channels), the correct configuration is to set the channel width for 802.11a (5 GHz) to 40 MHz and set the 24 Mbps data rate to Mandatory. Channel bonding refers to combining two adjacent 20 MHz channels into a single 40 MHz channel, doubling the channel width. Since the requirement specifies 5 GHz operation (where high-density design is appropriate), this must be applied to the 802.11a radio profile, not 802.11b (which operates only on 2.4 GHz). Setting 24 Mbps as Mandatory ensures that APs transmit management frames (beacons, probe responses, and other control frames) only at 24 Mbps - this is how the ' only allow APs to send 802.11 management frames at 24 Mbps ' requirement is implemented. Setting it as Supported (Options B and D) would allow the AP to use lower rates for management frames. Options A and D incorrectly target
802.11b, which does not support 40 MHz channels. Reference: WLSD Study Guide - High-Density WLAN Design, 802.11a Channel Configuration, Data Rate and Channel Width Settings.
NEW QUESTION # 45
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment. Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
- A. Create a mobility group with the same names on both wireless controllers.
- B. Open HTTPS port 443 between the wireless controllers.
- C. Create a mobility tunnel between the wireless controllers.
- D. Create a static RF group leader on one of the wireless controllers.
- E. Open UDP ports 16666 and 16667 between the wireless controllers.
Answer: C,E
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D). UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic - both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function. HTTPS port 443 (Option B) is used for web management and API communication, not for mobility tunneling. A static RF group leader (Option C) is a RRM configuration unrelated to AP failover capability. Creating a mobility group with the same names (Option E) is a component of the configuration but alone is insufficient without the mobility tunnel and open firewall ports. Reference:
WLSD Study Guide - Inter-Site WLC Failover Design, Mobility Tunnel Requirements, Firewall Port Planning for WAN-Separated Controllers.
NEW QUESTION # 46
An educational organization recently deployed an anchored WLAN and has a high number of client connections at any given time that stream video. The wireless infrastructure includes two Cisco 9800 WLCs.
To prevent web traffic being slow, an engineer must configure the deployment to prevent excessive fragmentation of the client data. Which configuration must the engineer apply?
- A. Adjust the TCP MSS value below the fragmentation point.
- B. Set the MTU on both controllers to match.
- C. Set the do not fragment bit on the mobility tunnel.
- D. Increase the MTU on both controllers.
Answer: A
Explanation:
In an anchored WLAN deployment, client traffic is encapsulated within CAPWAP mobility tunnels between the foreign WLC (where the AP joins) and the anchor WLC (in the DMZ or designated network segment).
This tunneling adds encapsulation overhead - CAPWAP/mobility tunnel headers consume a portion of the available MTU on the transport path. When video streaming clients generate large TCP segments, these segments may exceed the effective MTU of the mobility tunnel path, causing IP fragmentation at the WLC or along the path to the anchor. Fragmentation significantly degrades throughput and increases CPU overhead for high-volume video traffic. The correct solution is TCP MSS Clamping - reducing the Maximum Segment Size value advertised in TCP SYN packets so that TCP endpoints negotiate a segment size remaining below the fragmentation threshold. The Cisco 9800 WLC supports TCP MSS adjustment, which intercepts TCP handshake packets and rewrites the MSS option to a value accounting for CAPWAP tunnel overhead. Setting matching MTUs (Option A) does not prevent fragmentation if the effective tunnel MTU is lower than the client segment size. Increasing the MTU (Option B) is often constrained by physical infrastructure. Setting the DF bit (Option D) would cause packets to be dropped rather than fragmented.
Reference: WLSD Study Guide - Anchored WLAN Design, CAPWAP Mobility Tunnel MTU, TCP MSS Clamping.
NEW QUESTION # 47
A company has three Cisco WLCs that are joined as a mobility group. Mobility multicast messaging is enabled. All the WLCs in the mobility group communicate via a multicast. Which configuration must be identical between the three WLCs to validate communication?
- A. service port IP address
- B. multicast IP address
- C. interface IDs
- D. management IP address
Answer: B
NEW QUESTION # 48
An enterprise is using wireless as the main network connectivity for clients. To ensure wireless network availability, two standalone controllers are installed in the head office. APs are connected to the controllers using a round-robin approach to load balance the traffic. After a power cut, the wireless clients disconnect while roaming. An engineer tried eping from the controller but fails. Which protocol needs to be allowed between the networks that the controllers are installed?
- A. IP Protocol 77
- B. IP Protocol 97
- C. IP Protocol 87
- D. IP Protocol 67
Answer: B
Explanation:
When eping (EoIP ping) fails between two Cisco Wireless LAN Controllers, it indicates that the data path of the mobility tunnel is blocked. In Cisco AireOS wireless networks, the mobility data path uses IP Protocol 97 (EtherIP - Ethernet-over-IP encapsulation) for tunneling client traffic between the anchor and foreign controllers. This is distinct from the control path, which uses UDP port 16666. When the mobility data path (IP Protocol 97) is blocked by a firewall or ACL between the two controllers ' networks, eping will fail because eping specifically tests the EoIP data encapsulation path. After a power cut, when clients disconnect and attempt to roam between APs on different controllers, the mobility tunnel must be operational for session continuity. If IP Protocol 97 is blocked, the mobility data plane cannot function, causing client disconnections during inter-controller roaming events. The other IP protocols listed (67, 77, 87) are not used for Cisco WLC mobility tunneling. Reference: WLSD Study Guide - Mobility Tunnel Data Path, IP Protocol 97 (EtherIP), eping Command and Troubleshooting.
NEW QUESTION # 49
The wireless team must configure a new voice SSID for optimized roaming across multiple WLCs with Cisco
8821 phones. Which two settings accomplish this goal? (Choose two.)
- A. Use AVC to tag traffic voice traffic as best effort.
- B. Configure AVC profile on new SSID.
- C. Configure AP groups between WLCs.
- D. Configure mobility groups between WLCs.
- E. Use Cisco Centralized Key Management for authentication.
Answer: D,E
Explanation:
For optimized roaming across multiple Wireless LAN Controllers (WLCs) with Cisco 8821 IP phones, two critical settings must be configured. First, configuring mobility groups between WLCs (Option A) allows for seamless inter-controller roaming by establishing mobility tunnels between controllers, enabling them to share client security context, preventing re-authentication when a phone roams from an AP on one WLC to an AP on another. Second, using Cisco Centralized Key Management (CCKM) for authentication (Option B) reduces the time required for re-authentication during roaming from a full 802.1X exchange to a single- message re-key process. CCKM stores the wireless security keys at the WLC level, enabling rapid key re- derivation during roaming without contacting the RADIUS server. AP groups (Option C) control SSID and VLAN assignments per AP cluster but have no impact on inter-controller roaming. AVC profiles (Options D and E) control application visibility and QoS marking - marking voice as best effort (Option E) would actually degrade rather than improve voice quality. Reference: WLSD Study Guide - VoWLAN Mobility Optimization, CCKM Configuration, Mobility Group Design for Multi-Controller Deployments.
NEW QUESTION # 50
An enterprise is using two wireless controllers to support the wireless network. The data centre is located in the head office. Each controller has a corporate WLAN configured with different SSID names. The APs are installed using a round-robin approach to load balance the traffic. What should be changed in the configuration to optimize roaming?
- A. Use the same WLAN name for the corporate network on both controllers.
- B. Place the access points per floor on the same controller.
- C. Use the same WLAN name for the corporate network on both controllers.
- D. Move all access points to one controller and use the other as N+1 HA.
Answer: A
Explanation:
To optimize roaming in a wireless network with multiple controllers, it is essential to use the same WLAN name (SSID) across all controllers. When SSIDs differ between controllers, clients perceive them as different networks and must perform a full re-association and re-authentication when roaming between APs managed by different controllers. This causes a roaming disruption equivalent to connecting to an entirely new network. By using identical SSID names on both controllers, clients can seamlessly roam between APs on different controllers within the same mobility group - the controllers exchange client state information via the mobility tunnel, enabling seamless handoff. In the scenario described, ' Copr-NET390595865WLC-1 ' and
' Copr-NET6837l638WLC-2 ' are different SSIDs, meaning clients cannot roam transparently between them.
Making both controllers broadcast the same SSID name (and using a mobility group to connect the controllers) resolves this. Reference: WLSD Study Guide - SSID Consistency Across Controllers, Inter- Controller Roaming, Mobility Group Configuration.
NEW QUESTION # 51
A customer is migrating from a legacy Cisco AireOS WLC to a new Cisco 9800 IOS XE WLC with Cisco
9100 APs. The new APs must associate to the Catalyst 9800 WLC, and wireless clients must seamlessly roam between the old and new WLCs even during SSO. The new Catalyst 9800 WLC deployment is configured to use SSO. Which command must be added to meet the requirements?
- A. C9800(config)# ip default-gateway < IP >
- B. C9800# wireless mobility mac-address < MAC >
- C. C9800(config)# management gateway-failover enable
- D. C9800# chassis redundancy ha-interface local-ip < local IP > subnet < local IP subnet > remoteip < remote >
Answer: B
Explanation:
In a mixed deployment where a Cisco Catalyst 9800 IOS XE WLC operating in SSO is required to establish a mobility peer relationship with a legacy AireOS WLC, the critical configuration requirement is that the 9800 SSO pair presents a single, consistent mobility MAC address to all peer WLCs. When the 9800 is in SSO mode, the active and standby controllers function as a single logical entity, but AireOS WLCs identify mobility peers by MAC address. If the MAC address changes during an SSO switchover, the AireOS peer will detect the change and tear down the mobility tunnel, disrupting inter-controller client roaming. The command ' wireless mobility mac-address < MAC > ' configures a static, persistent mobility MAC address on the 9800 SSO pair that remains constant regardless of which physical unit is active. This ensures the AireOS WLC always identifies the 9800 pair by the same MAC address, maintaining the mobility tunnel and enabling seamless client roaming. Option A configures the HA interface for SSO synchronization but not for AireOS mobility interoperability. Option B sets a default gateway. Option D enables management gateway failover, unrelated to mobility peer identification. Reference: WLSD Study Guide - IOS XE WLC SSO Configuration, AireOS to 9800 Migration, Mobility Peer MAC Address Management.
NEW QUESTION # 52
During a post-deployment site survey, issues are found with non-Wi-Fi interference. What should the engineer use to identify the source of the interference?
- A. Wireless intrusion prevention
- B. Cisco spectrum expert
- C. Network analysis module
- D. Wireshark
Answer: B
Explanation:
Cisco Spectrum Expert is a dedicated spectrum analysis tool designed to identify and analyze non-Wi-Fi interference sources at Layer 1. During a post-deployment site survey, it can detect interference from various devices such as cordless phones, Bluetooth devices, microwave ovens, video cameras, and other unlicensed RF emitters. The tool provides a visual representation of the RF environment across the frequency spectrum, allowing engineers to pinpoint the exact source of interference and characterize it by duty cycle, frequency, and interference pattern. A network analysis module (Option A) operates at Layer 2 and above, unable to detect non-802.11 RF emissions. Wireless intrusion prevention (Option B) detects rogue APs and 802.11 attacks but not Layer 1 RF noise. Wireshark (Option C) is a packet capture tool for Layer 2-7 analysis and cannot detect non-Wi-Fi RF energy. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Post- Deployment Survey, Non-Wi-Fi Interference Identification.
NEW QUESTION # 53
An engineer configured the optimized client roaming on Cisco WLC with an RSSI threshold of -72 dBm.
Clients report frequent disconnections. What must be configured for the AP to guide the client to a better AP?
- A. Disable optimized roaming and enable 802.11v support on the SSID.
- B. Enable BSS transition on the SSID and optimized roaming at the radio level.
- C. Disable coverage hole detection on the SSID and enable BSS transition on the SSID.
- D. Enable BSS transition at the radio level and optimized roaming on the SSID.
Answer: B
Explanation:
The scenario presents a critical distinction in where Cisco WLC features are configured. Optimized roaming on Cisco WLC is a radio-level feature that monitors connected client RSSI and, when a client ' s signal falls below the configured threshold (-72 dBm), triggers a disassociation to force the client to reconnect to a stronger AP. However, without a mechanism to guide the client proactively before reaching the threshold, clients that disassociate simply reconnect to whatever AP their device selects, potentially causing the reported frequent disconnections. BSS Transition Management (802.11v) is configured at the SSID level and provides the complementary mechanism: before the client reaches the RSSI threshold, the AP sends a BSS Transition Management Request pointing the client toward a specific target AP with stronger signal. The correct architecture requires: optimized roaming configured at the radio level (triggering disconnection when RSSI falls too low) combined with BSS transition enabled at the SSID level (guiding the client to a better AP before forced disconnection). Options C and D incorrectly reverse the configuration levels for these features.
Disabling coverage hole detection (Option B) addresses a different problem and would not resolve the disconnection issue. Reference: WLSD Study Guide - Optimized Roaming Configuration, BSS Transition Management (802.11v), Client Roaming Architecture on Cisco WLC.
NEW QUESTION # 54
A customer has a single anchor WLC named Anchor A. Anchor A is in a DMZ and provides guest access.
The customer wants to deploy an additional anchor controller named Anchor B to provide redundancy if Anchor A fails. Which design approach should be taken for the guest WLAN priority on the foreign WLC for each anchor WLC?
- A. Set Anchor A to priority 3 and Anchor B to priority 1.
- B. Set Anchor A to priority 1 and Anchor B to priority 3.
- C. Set Anchor A to priority 1 and Anchor B to priority 1.
- D. Set Anchor A to priority 3 and Anchor B to priority 3.
Answer: B
Explanation:
In a wireless network design where anchor redundancy is required for guest access, setting different priorities for the anchor controllers ensures deterministic primary and backup behavior. Cisco anchor priority uses a lower numerical value to indicate higher preference - Priority 1 is the highest priority (most preferred) anchor, and Priority 3 is lower priority. Setting Anchor A to priority 1 (Option D) makes it the primary anchor controller - all new guest client sessions will preferentially anchor to Anchor A. Setting Anchor B to priority
3 makes it the standby anchor - guest clients will only be anchored to Anchor B when Anchor A is unavailable. This creates a clear primary/backup relationship with deterministic failover. Setting both anchors to the same priority (Options A and C) would result in load balancing between the two anchors rather than active/standby behavior. Option B incorrectly reverses the priorities, making Anchor B the primary and Anchor A the backup. Reference: WLSD Study Guide - Guest Anchor Redundancy Design, Anchor Priority Configuration, DMZ Anchor WLC Architecture.
NEW QUESTION # 55
What causes the most signal attenuation based on the wireless design tools?
- A. cinder block wall
- B. glass wall
- C. office window
- D. metal door
Answer: D
Explanation:
Metal doors cause the most signal attenuation among common building materials due to the fundamental electromagnetic properties of metal. Metal is highly reflective and absorptive of radio frequency signals - it creates what is effectively a Faraday cage effect around any room or space it encloses. In wireless design attenuation modeling tools such as Ekahau, metal is assigned the highest attenuation value among standard building materials, typically 30+ dB per surface. Cinder block walls (Option A) are dense and provide significant attenuation (10-15 dB) but are not as RF-impenetrable as solid metal. Glass walls (Option C) and office windows (Option D) have relatively low attenuation values (2-4 dB) due to the minimal RF-absorbing properties of glass. When engineers model attenuation materials in predictive survey tools, metal doors and metal-containing structures consistently produce the highest per-surface attenuation values, making them the primary barrier obstacles to plan around. Reference: WLSD Study Guide - RF Signal Attenuation, Building Material Attenuation Values, Predictive Survey Material Modeling.
NEW QUESTION # 56
A consulting engineer is preparing to survey a brownfield deployment for a 6000-sqft building with four floors that have APs. The entire building is being remodeled and the furniture, office walls, and decoration are being updated. The engineer must perform a survey analysis on the potential RF impact of newer furniture materials. How must the survey be conducted?
- A. Use a survey tool with the existing AP positions using building floor maps and material configuration.
- B. Evaluate the neighbor APs strength and density based on the radio statistics information of each AP.
- C. Perform a sweep analysis first to predict the signal strength across each point in a floor.
- D. Measure upstream and downstream data rates based on the remodeling of the building.
Answer: A
Explanation:
A brownfield deployment scenario involves an existing operational wireless network where a physical remodel will change the RF environment. The engineer ' s task is to assess the impact of new furniture and wall materials on the existing AP placement - a scenario requiring a predictive re-analysis of how changed materials will alter propagation from the existing AP locations. Using a survey tool such as Ekahau with the known AP positions superimposed on updated floor plans, the engineer can reconfigure material attenuation properties to reflect new construction materials and re-run the predictive propagation model. This produces a before/after comparison identifying coverage gaps or interference hotspots introduced by the remodel without requiring physical downtime or temporary infrastructure changes. Option A (sweep analysis) measures existing signal strength but does not model future material changes. Option B (neighbor AP statistics) evaluates the current RF environment using WLC data, not future conditions. Option C (throughput measurements) tests current performance, not future RF impact. Reference: WLSD Study Guide - Brownfield Survey Methodology, Material Attenuation Modeling, Post-Remodel RF Impact Analysis.
NEW QUESTION # 57
A network engineer is designing a new wireless network. The network must include these requirements: * optimized performance * avoid interference * availability in high-density areas * roaming Which two approaches must be taken? (Choose two.)
- A. 2.4 GHz frequency band with 40 MHz channels
- B. 2.4 GHz frequency band with 20 MHz channels
- C. 5 GHz frequency band with 40 MHz channels
- D. 5 GHz frequency band with 80 MHz channels
- E. 5 GHz frequency band with 20 MHz channels
Answer: B,E
Explanation:
The design requirements - optimized performance, interference avoidance, high-density support, and roaming capability - collectively point to a dual-band strategy using narrow channel widths. For 5 GHz operation (Option A), 20 MHz channels are the correct choice for high-density and campus-scale deployments. The 5 GHz band has significantly more non-overlapping channels compared to 2.4 GHz (up to
24 non-overlapping 20 MHz channels in UNII-1, UNII-2, and UNII-3), enabling a robust channel reuse plan with minimal co-channel interference and excellent roaming cell separation. Wider 5 GHz channels (Options C and E - 80 MHz and 40 MHz) would consume multiple channel blocks, dramatically reducing the number of available non-overlapping channels and increasing co-channel interference in dense deployments. For 2.4 GHz operation (Option B), 20 MHz channels are mandatory - there are only three non-overlapping 20 MHz channels (1, 6, 11) in the 2.4 GHz band. Using 40 MHz channels in 2.4 GHz (Option D) eliminates all non- overlapping channel separation, causing massive co-channel interference and is universally contraindicated in enterprise designs. Reference: WLSD Study Guide - Channel Planning, High-Density Design, Frequency Band Selection.
NEW QUESTION # 58
A wireless engineer must design a WLAN for a university that requires outdoor Wi-Fi access. Which obstruction has the greatest effect on wireless signal propagation?
- A. wind
- B. poles
- C. trees
- D. rain
Answer: C
Explanation:
In outdoor wireless deployments, foliage - particularly dense trees - represents the most significant and variable RF obstruction that engineers must account for during site survey and design. Trees are problematic for multiple compounding reasons: the high water content of living tissue causes signal absorption consistent with the principle that water is an effective absorber of 2.4 GHz and 5 GHz RF energy; the irregular branching structure causes multi-path scattering; and foliage density changes seasonally, meaning signal propagation characteristics measured during winter may differ substantially from summer readings when leaves are fully developed. A fully leafed deciduous tree can attenuate a 5 GHz signal by 6-15 dB depending on density and depth. Wind (Option A) causes only momentary mechanical movement of foliage and is not an obstruction itself. Rain (Option B) causes some absorption at higher frequencies but its effect at 2.4 GHz and
5 GHz in typical conditions is marginal compared to foliage. Poles (Option D) are thin structures with minimal RF impact. Outdoor surveys for university campuses must specifically account for tree locations, canopy density, and seasonal variation. Reference: WLSD Study Guide - Outdoor Wireless Design, Environmental RF Attenuation Factors, Outdoor Site Survey Considerations.
NEW QUESTION # 59
An engineer is designing a solution where guests terminate on an anchor controller in the DMZ. The engineer is having issues and wants to test connectivity between members of a mobility group. Which two steps must be performed to test whether a mobility control packet can be reached over the management interface?
(Choose two.)
- A. Use the mping command on both WLCs.
- B. Open IP protocol 97 between both WLCs.
- C. Use the eping command on both WLCs.
- D. Use the tracert command on the WLC.
- E. Open UDP port 16666 between both WLCs.
Answer: A,E
Explanation:
To test whether mobility control packets can reach between WLC peers in a mobility group (used to validate the anchor controller DMZ setup), two steps are required. First, the mping (mobility ping) command (Option A) is the Cisco WLC CLI tool specifically designed to test mobility control path connectivity between WLC peers. Running mping on both WLCs verifies that mobility control messages (UDP port 16666) can be exchanged bidirectionally. Second, UDP port 16666 must be open between the WLCs (Option C) - mping uses this port, and if it is blocked by a firewall (which is common when the anchor is in a DMZ), the mobility control path cannot be established. These two steps together - sending mping packets and confirming the firewall permits UDP 16666 - validate mobility control plane connectivity. The eping (EoIP ping) command (Option B) tests the data path tunnel, not the control path. IP Protocol 97 (Option D) is for the data plane in legacy mobility mode. Tracert (Option E) traces routing paths but does not validate mobility protocol connectivity. Reference: WLSD Study Guide - Mobility Group Troubleshooting, mping Command, UDP
16666 Firewall Requirements.
NEW QUESTION # 60
A customer has multiple WLCs running in N+1 redundancy with APs load balanced between the WLCs. The customer performs AP failover testing between the WLCs and notices that some of the APs do not move back to their primary WLC after it recovers. What are two points that must be addressed in the design? (Choose two.)
- A. AP Fallback is not enabled on one of the WLCs.
- B. DHCP Option 43 information is incorrect.
- C. APs do not have their primary WLC information configured correctly.
- D. APs do not have their secondary WLC information configured correctly.
- E. APs failover priorities are set to Low.
Answer: A,C
Explanation:
In an N+1 redundancy deployment, an AP ' s ability to return to its designated primary WLC after that controller recovers depends on two distinct configuration requirements working in concert. First, the AP Fallback feature (Option C) must be enabled on the WLC. AP Fallback instructs APs to monitor the availability of their configured primary controller and automatically reconnect to it when it becomes available again, rather than remaining permanently joined to the N+1 backup controller. Without AP Fallback enabled, APs stay connected to whichever controller they most recently joined. Second, the APs must have their primary WLC information correctly configured (Option D). If an AP does not have the primary controller ' s name, IP address, or FQDN correctly set, it cannot identify when its designated primary has recovered and therefore cannot initiate a return fallback. DHCP Option 43 (Option A) is used for initial AP discovery only.
Secondary WLC configuration (Option B) addresses failover direction but not the return path. AP failover priority (Option E) controls which APs are moved first during a failover event, not whether fallback occurs.
Reference: WLSD Study Guide - N+1 Redundancy Design, AP Fallback Configuration, Controller Primary, Secondary and Tertiary Assignment.
NEW QUESTION # 61
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