Aug-2026 Cisco 300-110 Actual Questions and Braindumps
300-110 Dumps To Pass Cisco Exam in 24 Hours - PDFDumps
NEW QUESTION # 53
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. Wireshark
- B. Cisco spectrum expert
- C. Wireless intrusion prevention
- D. Network analysis module
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 # 54
A customer has a Cisco wireless network that supports VoWLAN services. The customer wants supported voice clients to receive roaming recommendations and suggestions from APs. This functionality must not impact non-VoWLAN clients. What should be enabled on the VoWLAN SSID?
- A. 802.11r Fast Transition
- B. CCKM with 802.1X
- C. 802.11k neighbor lists
- D. 802.11v BSS Transition Management
Answer: D
Explanation:
IEEE 802.11v BSS Transition Management is the standard that enables the network (via the AP) to actively provide roaming recommendations and suggestions to associated clients. When enabled on a SSID, the AP can send BSS Transition Management Request frames to clients, informing them of preferred target APs ranked by signal quality, load, and channel conditions. Critically, BSS Transition Management is a voluntary mechanism - clients that support 802.11v can act on the AP ' s recommendation, while clients that do not support 802.11v simply ignore the BSS Transition Request frames and continue operating normally. This selective applicability directly satisfies the requirement that non-VoWLAN clients must not be impacted.
802.11k (Option A) enables clients to build neighbor lists through measurement reports - this is a client- initiated process, not an AP-to-client recommendation. CCKM (Option B) is a Cisco proprietary fast roaming mechanism for legacy clients, unrelated to roaming guidance. 802.11r (Option D) accelerates the re- association handshake during roaming but does not provide proactive roaming recommendations. Reference:
WLSD Study Guide - VoWLAN Design, 802.11v BSS Transition Management, Roaming Optimization Protocols.
NEW QUESTION # 55
Which strategies must the engineer use for the antenna deployment model in a warehouse?
- A. wall-mounted, patch directional antennas
- B. ceiling-mounted, directional antennas
- C. ceiling-mounted, high-gain, omnidirectional antennas
- D. wall-mounted, low-gain, omnidirectional antennas
Answer: A
Explanation:
Warehouse wireless deployments present unique RF engineering challenges: extremely high ceilings (often
25-45 feet), dense metallic shelving systems that create specular reflections and RF shadows, narrow aisles between rack systems, and the need to cover linear travel paths for RF scanner devices. The recommended Cisco antenna strategy for warehouses is wall-mounted patch (directional) antennas. Patch antennas provide a forward-facing radiation pattern that can be aimed precisely down warehouse aisles, delivering concentrated RF energy where RF scanners actually operate - in the aisles between shelving - rather than dispersing energy into metallic shelving structures. Wall mounting at intermediate height (typically 10-15 feet on aisle- end walls) places the antenna at a height that aligns the main lobe with the working zone of handheld scanners. Ceiling-mounted omnidirectional antennas (Options A and C) at warehouse ceiling height suffer from excessive path loss to floor-level devices and metal shelving obstructions. Low-gain wall-mounted omnidirectional antennas (Option B) lack the directivity needed to focus energy down specific aisles.
Reference: WLSD Study Guide - Warehouse Wireless Design, Antenna Selection and Placement, Industrial RF Environment Considerations.
NEW QUESTION # 56
What causes the most signal attenuation based on the wireless design tools?
- A. office window
- B. cinder block wall
- C. glass wall
- 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 # 57
An engineer is using Ekahau Site Survey to create a WLAN plan for a warehouse. The plan is to use patch antennas. Which setting is adjusted when simulated APs are placed on the map?
- A. AP channel
- B. Wi-Fi technology
- C. antenna downtilt
- D. AP transmission power
Answer: C
Explanation:
In Ekahau Site Survey, when planning a warehouse deployment using patch (directional) antennas, the antenna downtilt setting is the critical adjustment made when placing simulated APs on the floor plan map.
Patch antennas have a defined radiation pattern with a main lobe that must be aimed precisely at the intended coverage zone. In a warehouse environment, APs with patch antennas are typically wall-mounted and aimed down aisles. The downtilt angle determines the vertical component of the antenna ' s aim - adjusting the downtilt in Ekahau tilts the simulated antenna ' s main radiation lobe downward toward the warehouse floor and the working zone of RF scanner devices, rather than projecting RF energy horizontally at an ineffective angle. Ekahau allows engineers to specify the horizontal and vertical orientation of the antenna in three dimensions, and the downtilt value directly controls how the software models the antenna ' s coverage pattern in the vertical plane. AP channel (Option A) is set during channel planning, not during AP placement. Wi-Fi technology (Option B) determines the modulation and protocol standard but is set as an AP property. AP transmission power (Option D) controls cell radius but is set separately from antenna orientation. Reference:
WLSD Study Guide - Ekahau Predictive Survey, Directional Antenna Configuration, Warehouse RF Design and Antenna Orientation.
NEW QUESTION # 58
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. Set the MTU on both controllers to match.
- B. Increase the MTU on both controllers.
- C. Adjust the TCP MSS value below the fragmentation point.
- D. Set the do not fragment bit on the mobility tunnel.
Answer: C
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 # 59
A customer is planning to replace older access points with Cisco 4800 Series Access Points. Unaware of the infrastructure requirements, the client has an engineer investigate the inline power requirement. Which IEEE
802.3 standard complies with the Cisco 4800 Series Access Points?
- A. 802.3at
- B. 802.3bt
- C. 802.3ac
- D. 802.3af
Answer: B
Explanation:
The Cisco Aironet 4800 Series Access Point is a tri-radio, high-performance access point designed for high- density environments. It draws significantly more power than older dual-radio APs and requires IEEE 802.3bt (also known as PoE++), which provides up to 90W per port at the Power Sourcing Equipment. IEEE 802.3af (Type 1 PoE) delivers only 15.4W and 802.3at (Type 2 PoE+) provides up to 30W - both are insufficient for full functionality of the 4800 series, which has a dedicated third scanning radio that requires the additional power budget provided by 802.3bt. IEEE 802.3ac is a standard related to VLAN tagging and is entirely unrelated to Power over Ethernet. Engineers designing wired infrastructure for Cisco 4800 deployments must ensure switches support 802.3bt Type 3 or Type 4 to guarantee full AP functionality across all three radios simultaneously. Reference: WLSD Study Guide - Wired Infrastructure Design, PoE Standards and Power Budget Planning, Cisco 4800 Series AP Specifications.
NEW QUESTION # 60
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 1 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 3 and Anchor B to priority 3.
- D. Set Anchor A to priority 3 and Anchor B to priority 1.
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 # 61
A wireless engineer is using Ekahau site survey to validate that an existing wireless network is operating as expected. Which type of survey should be used to identify end-to-end network performance?
- A. Passive
- B. Spectrum analysis
- C. GPS assisted
- D. Active ping
Answer: D
Explanation:
An active ping survey is used to validate network performance by sending and receiving data packets to measure end-to-end network performance, including latency, packet loss, and throughput. Ekahau site survey tools can perform active ping surveys to test the connectivity and performance of the wireless network while the surveyor walks the floor plan, producing a geographically correlated map of network performance metrics.
This differs fundamentally from passive surveys, which only measure signal strength from beacons. A GPS- assisted survey (Option A) is used for large outdoor areas to automate location tracking. Spectrum analysis (Option B) identifies Layer 1 RF conditions but does not measure network performance. A passive survey (Option C) measures RSSI and SNR but does not test actual data connectivity or throughput. Active ping is the correct tool for validating that the network delivers the expected end-to-end service levels. Reference:
WLSD Study Guide - Ekahau Survey Types, Active Survey Methodology, Post-Deployment Validation.
NEW QUESTION # 62
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. Wireshark
- B. Cisco spectrum expert
- C. Wireless intrusion prevention
- D. Network analysis module
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 # 63
An engineer is performing a Layer 1 passive wireless site survey utilizing a channel analyzer software in the
2.4 GHz spectrum. Which chart indicates the ratio of interference present during the duration of the capture?
- A. Option D
- B. Option C
- C. Option B
- D. Option A
Answer: B
Explanation:
In a Layer 1 passive wireless site survey using a channel analyzer tool (such as Metageek Chanalyzer or Cisco Spectrum Expert) in the 2.4 GHz spectrum, the chart that indicates the ratio of interference present during the capture duration is the Duty Cycle chart. The duty cycle chart displays the percentage of time that detected energy - including both Wi-Fi and non-Wi-Fi signals - is present on each channel. A high duty cycle on a channel indicates that the channel is occupied by transmissions for a significant portion of time, reducing available airtime for Wi-Fi clients. This chart directly communicates the ratio of interference because it shows what fraction of the observation period had detectable RF energy above the noise floor. Signal strength charts show amplitude (how strong), while duty cycle charts show temporal occupancy (how often) - the latter is the correct metric for quantifying interference ratio. Reference: WLSD Study Guide - Layer 1 Spectrum Analysis, Duty Cycle Chart Interpretation, Spectrum Analyzer Methodology.
NEW QUESTION # 64
A network engineer must review the design for a Cisco wireless deployment at a hospital. The deployment will have two Cisco 9800 WLCs configured with SSO, one Cisco 9800 WLC joined to the SSO controllers using a mobility tunnel, and one Cisco 9800 WLC that will be used as a service/dev controller and not joined using a mobility tunnel. Which high availability option must be incorporated in the design to ensure that APs choose the service/dev controller last when trying to associate?
- A. primary
- B. tertiary
- C. secondary
- D. AP failover priority
Answer: B
Explanation:
In Cisco ' s AP controller preference hierarchy, each AP can be configured with a primary, secondary, and tertiary controller designation. The AP will attempt to join controllers in this exact order: primary first, secondary second, and tertiary third. When no controllers from the preference list are available, the AP may fall back to any reachable controller through standard CAPWAP discovery. In this hospital deployment, the service/development controller must be the controller of last resort - it should only receive AP associations when all other options are exhausted. Configuring the service/dev controller as the tertiary controller in the APs ' preference configuration ensures exactly this behavior: APs will attempt the SSO pair (primary) first, then the third production WLC joined via mobility tunnel (secondary), and only then the service/dev controller (tertiary). This prevents development traffic from disrupting production service, and ensures production APs do not inadvertently join the service environment during partial outages. Configuring it as primary (Option A) or secondary (Option C) would allow APs to join the service controller before exhausting production options. AP failover priority (Option D) governs which APs are processed during controller recovery, not the controller preference order during join. Reference: WLSD Study Guide - AP Controller Preference Configuration, Primary/Secondary/Tertiary WLC Assignment, Hospital WLAN High Availability Design.
NEW QUESTION # 65
An engineer is conducting a Layer 2 site survey. Which type of client must the engineer match to the survey?
- A. best client available
- B. worst client available
- C. phone client
- D. normal client
Answer: B
Explanation:
When conducting a Layer 2 site survey, it is recommended to match the survey to the worst client available.
This ensures that the wireless network is designed to provide adequate coverage and performance even for clients with the poorest RF capabilities, thereby providing a consistent user experience for all devices. The worst client typically has fewer antennas, lower receiver sensitivity, and less sophisticated chipsets. By designing to its limitations, the engineer guarantees that every device in the environment meets the minimum performance threshold. Using the best client (Option A) or an average client (Option C) would result in coverage gaps for less capable devices. A phone client (Option B) may have unique characteristics but is not a universally applicable standard for general survey purposes. Reference: WLSD Study Guide - Site Survey Methodology, Client Selection for Survey, Layer 2 Pre-Deployment Survey.
NEW QUESTION # 66
A network engineer is configuring high availability on an access point. What is the maximum number of controllers that can be configured?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
When configuring high availability on a Cisco access point, the AP can be configured with a maximum of three controllers: a primary controller, a secondary controller, and a tertiary controller. This three-tier hierarchy defines the failover order - the AP first attempts to join its primary controller, then the secondary if the primary is unavailable, and finally the tertiary if both the primary and secondary are unreachable. After exhausting all three configured options, the AP enters a discovery process to find any available controller.
This three-controller configuration (primary, secondary, tertiary) allows network engineers to implement N+1 redundancy where critical APs can be directed to specific backup controllers in a deliberate sequence.
Limiting the configuration to only 2 controllers (as stated in Option B which would be incorrect) would reduce redundancy options for environments with geographically distributed controllers requiring specific failover paths. Reference: WLSD Study Guide - AP High Availability Configuration, Primary/Secondary
/Tertiary Controller Assignment, AP Failover Design.
NEW QUESTION # 67
A wireless engineer is using Ekahau Site Survey to validate that an existing wireless network is operating as expected. A Cisco CleanAir AP is used for Layer 1 survey by using Metageek Chanalyzer only on the current operating channel. Which operating mode is configured for the Cisco CleanAir AP?
- A. Local
- B. SE-connect
- C. Monitor
- D. Sniffer
Answer: B
Explanation:
When using Metageek Chanalyzer in conjunction with a Cisco CleanAir-capable AP for Layer 1 spectrum analysis, the AP must be configured in SE-Connect mode (Spectrum Expert Connect). SE-Connect mode enables the AP ' s CleanAir radio to operate as a dedicated spectrum analyzer, feeding raw spectrum data to the connected Chanalyzer software for visualization and analysis. In this mode, the AP does not serve any Wi- Fi clients and instead focuses all radio resources on spectrum scanning. Metageek Chanalyzer uses the SE- Connect mode specifically to receive the CleanAir ASIC ' s spectrum analysis data. Local mode (Option A) serves clients normally, only providing periodic CleanAir reports. Sniffer mode (Option B) captures 802.11 frames for protocol analysis and does not provide raw spectrum data to Chanalyzer. Monitor mode (Option C) performs WIDS scanning and RRM measurements but does not support the direct Chanalyzer integration. SE- Connect is the specific mode that enables external spectrum analysis software to use the CleanAir ASIC ' s spectrum data in real time. Reference: WLSD Study Guide - Cisco CleanAir Technology, AP Operating Modes, SE-Connect Mode for Spectrum Analysis.
NEW QUESTION # 68
A customer has two Cisco WLCs configured in a SSO cluster. The wireless network supports a large warehouse. The customer purchases new iPads to replace legacy scanners. Both devices connect to a single SSID named Scanning by using WPA2 Personal. The customer wants to use a standards-based method for fast roaming on the new iPads. Which approach meets the scanner requirement and still supports the legacy scanners?
- A. Enable FT PSK and set Fast Transition to Adaptive for the Scanning SSID.
- B. Enable FT 802.1X and set Fast Transition to Adaptive for the Scanning SSID.
- C. Enable optimized roaming globally and enable FT PSK on the Scanning SSID.
- D. Enable optimized roaming globally and enable FT 802.1X on the Scanning SSID.
Answer: A
Explanation:
The design challenge is enabling IEEE 802.11r Fast BSS Transition for the new iPads (the standards-based fast roaming method) while maintaining backward compatibility for legacy RF scanners that may not support
802.11r. The SSID uses WPA2 Personal (PSK), not 802.1X enterprise authentication - therefore the correct Fast Transition variant is FT PSK (pre-shared key), not FT 802.1X (Options A and B). The critical configuration parameter is setting Fast Transition to Adaptive mode rather than mandatory. Adaptive mode is a Cisco feature that allows the AP and SSID to support both 802.11r-capable clients (which will use FT PSK for fast roaming) and non-802.11r legacy clients (which will use the standard pre-FT roaming process). In Adaptive mode, legacy scanners that cannot negotiate 802.11r during association will fall back transparently to standard roaming, while the new iPads leverage FT PSK for minimal-interruption handoffs. If Fast Transition is set to mandatory, legacy clients that do not support 802.11r will fail to associate entirely. Option C uses optimized roaming globally, which is a different mechanism and does not address the iPads ' specific need for a standards-based fast roaming solution. Reference: WLSD Study Guide - 802.11r Fast BSS Transition, FT PSK Configuration, Adaptive Fast Transition for Mixed Client Environments.
NEW QUESTION # 69
An engineer must perform a predictive design for a wireless network. The customer has devices that can tolerate at most 100 ms of delay when roaming. Which design criteria must be used?
- A. location
- B. voice
- C. video
- D. data
Answer: B
Explanation:
Devices that can tolerate at most 100 ms of delay when roaming are voice devices. The 100 ms maximum roaming delay threshold is the Cisco-specified design criterion for VoWLAN implementations - it defines the maximum time a handset can tolerate being disconnected from the wireless network during a roam event before the voice call is degraded or dropped. This threshold drives specific design requirements: 15-20% cell overlap at -67 dBm, fast roaming mechanisms (802.11r, CCKM, or OKC), and AP placement along user movement paths. Location services (Option A) have flexible latency requirements. Data applications (Option B) can tolerate much higher latency - typically several hundred milliseconds. Video (Option C) streaming has buffering mechanisms that allow for higher latency tolerance than real-time voice. Only voice applications have the strict 100 ms roaming delay requirement that directly influences the predictive design criteria. Reference: WLSD Study Guide - VoWLAN Roaming Design, Roaming Delay Requirements, Predictive Survey Criteria.
NEW QUESTION # 70
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
- A. narrowband interference
- B. hidden node
- C. wideband interference
- D. reflection
Answer: B
Explanation:
The hidden node problem is a classic RF design flaw that emerges when APs transmit at excessive power levels relative to the attenuation characteristics of the environment. In a brick-walled building, AP signals penetrate walls with significant attenuation. When an AP transmits at maximum power, its signal propagates far beyond the intended cell boundary and reaches client devices that may be physically near other APs but unable to detect the original transmitting AP due to wall attenuation between them. These clients can hear the distant AP ' s signal but cannot hear each other - making them hidden from one another. This leads to simultaneous transmissions, frame collisions at the AP receiver, and dramatic throughput degradation. The
802.11 CSMA/CA mechanism depends on all stations being able to sense the medium before transmitting; hidden nodes defeat this mechanism entirely. The WLSD curriculum consistently identifies excessive AP transmit power in high-attenuation environments as a primary cause of hidden node conditions. The solution is to reduce AP transmit power so that cell sizes remain appropriate for the physical environment. Reference:
WLSD Study Guide - RF Design Fundamentals, Hidden Node Problem, Transmit Power and Cell Size Optimization.
NEW QUESTION # 71
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