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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Wireless Site Survey | 25% | - Post-deployment site survey - Predictive site survey - Material attenuation and its design effects - Pre-deployment site survey - Planning tools and network metrics evaluation - Collect design requirements and evaluate constraints - Layer 1 site survey analysis |
| Topic 2: WLAN High Availability | 20% | - Design controller high availability - Design AP high availability |
| Topic 3: Mobility | 25% | - Optimize client roaming - Validate mobility tunneling - Design mobility groups - Site Tags |
| Topic 4: Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design for data, voice, video, location - Design high-density wireless networks - Design wireless bridging (mesh) - Logical infrastructure requirements - Design radio management |
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NEW QUESTION # 77
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?
Answer: B
Explanation:
When Cisco WLCs are configured to use multicast for mobility group communications, all WLCs participating in the same mobility group must be configured with an identical multicast group IP address. The mobility multicast mode allows a WLC to send a single multicast frame received simultaneously by all other WLCs in the group, rather than sending individual unicast copies to each peer. For this to function correctly, every WLC in the group must join the same IP multicast group address, and the underlying network infrastructure must be configured to support IP multicast routing or IGMP snooping for that specific group address. If any WLC is configured with a different multicast IP address, it will join a different multicast group and will not receive mobility messages from the other WLCs, effectively isolating it from the group's communication plane.
NEW QUESTION # 78
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
Answer: C
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 # 79
A customer designs a Cisco wireless environment to provide connectivity to employees and guests. The guest SSID must be configured on three anchor WLCs named Anchor1, Anchor2, and Anchor3 in a DMZ. The guest anchor priority must be configured to ensure that Anchor1 has the highest priority. Which priority level must be incorporated in the design for Anchor1?
Answer: C
Explanation:
In Cisco's guest anchor WLC deployment model, multiple anchor controllers can be configured in a DMZ to provide redundancy for guest WLAN traffic. The anchor priority value determines which anchor controller is preferred for establishing the guest mobility tunnel from the foreign WLC.
Cisco's anchor priority system assigns the highest preference to the lowest numerical priority value. Priority 1 is the highest priority, meaning the foreign WLC will prefer Anchor1 when establishing the CAPWAP mobility tunnel for anchoring guest client traffic. Priority 2 would be assigned to Anchor2, and Priority 3 to Anchor3, creating a deterministic failover hierarchy. If Anchor1 becomes unreachable, the foreign controller automatically falls over to Anchor2, then to Anchor3. Priority 0 is not a valid anchor priority value in the Cisco WLC configuration. This design pattern is critical for enterprise guest deployments where DMZ anchor redundancy must be maintained without manual intervention.
NEW QUESTION # 80
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?
Answer: C
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.
NEW QUESTION # 81
An engineer must configure the virtual IP address on multiple controllers in a mobility group.
Which rule must the engineer follow to ensure proper roaming?
Answer: C
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non-routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with.
NEW QUESTION # 82
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