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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Topic 2: Wireless Site Survey | 25% | - Post-deployment site survey - Pre-deployment site survey - Planning tools and network metrics evaluation - Collect design requirements and evaluate constraints - Predictive site survey - Material attenuation and its design effects - Layer 1 site survey analysis |
| Topic 3: Mobility | 25% | - Design mobility groups - Site Tags - Optimize client roaming - Validate mobility tunneling |
| Topic 4: Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design wireless bridging (mesh) - Design for data, voice, video, location - Design high-density wireless networks - Logical infrastructure requirements - Design radio management |
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질문 # 25
How are mobility groups created, excluding mobility anchors?
정답：C
설명：
Mobility groups are created by configuring each Wireless LAN Controller (WLC) to use the same mobility domain name (mobility group name) and defining each WLC as a peer in the static mobility members list of every other WLC in the group. This bidirectional configuration establishes the trusted peer relationship and enables WLCs to exchange client information, security credentials, and state data for seamless roaming. The same mobility group name on all WLCs creates a shared identity; the static peer list defines which controllers are trusted mobility partners and provides their management IP addresses and MAC addresses for tunnel establishment.
질문 # 26
An enterprise network is deploying two Cisco Catalyst 9800 WLCs in a data center to ensure uninterrupted wireless services for a campus with thousands of users. The IT management requests a design that enables seamless failover without client reauthentication or loss of connectivity if one controller fails. Ease of configuration and ongoing management are high priorities. The controllers will be connected via a high-speed LAN segment, and both must support full active-passive redundancy for all managed APs. Which design approach meets the requirements?
정답：D
설명：
Cisco Stateful Switchover (SSO) on the Catalyst 9800 platform is the definitive high availability solution when requirements specify zero client reauthentication during failover, active-passive redundancy, and ease of management. With SSO enabled, the active and standby 9800 WLCs maintain a synchronized state database via a dedicated redundancy link -- this includes all client association state, authentication credentials, AP join information, and WLAN configurations.
When the active controller fails, the standby assumes control instantaneously with no CAPWAP session teardown and no 802.1X reauthentication required. The Redundancy Management Interface (RMI) provides a dedicated in-band keepalive and state synchronization path.
질문 # 27
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?
정답：C
설명：
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. Service port IP addresses (Option A) are unique per controller. Interface IDs (Option B) are locally significant identifiers. Management IP addresses (Option C) are unique per WLC and identify each peer in unicast configurations. Reference: WLSD Study Guide - Mobility Group Configuration, Multicast Mobility Messaging, WLC Peer Communication.
질문 # 28
Which issue occurs when wireless access points transmit by using the highest power level in a building that has brick walls?
정답：B
설명：
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.
질문 # 29
An engineer is designing a high-density WLAN that must support 100 concurrent users with 100 Mbps throughput consistently. The design allows for 20 Mbps per cell and per channel on the 5 GHz band. How many channels must the design use to provide 1 Mbps per user prior to RF overhead?
정답：B
설명：
This question requires straightforward wireless capacity engineering calculation. The total throughput requirement is 100 users × 1 Mbps per user = 100 Mbps aggregate. Each channel in the design can support 20 Mbps of usable throughput - this is the per-cell, per-channel allocation defined in the design parameters, representing usable throughput prior to RF overhead as stated in the question. The number of channels required is therefore: total required throughput divided by throughput per channel = 100 Mbps ÷ 20 Mbps per channel = 5 channels. In practice, each channel corresponds to a non-overlapping frequency assignment in the
5 GHz band. With 5 channels and 20 Mbps per channel, the design provides exactly 100 Mbps of aggregate capacity for 100 concurrent users at 1 Mbps each. This calculation methodology is foundational to Cisco ' s high-density WLAN design approach, where the number of spatial streams, channel allocations, and AP placement are all derived from the per-user throughput requirement multiplied by the concurrent user population. Reference: WLSD Study Guide - High-Density WLAN Capacity Planning, Per-User Throughput Calculation, Channel Planning and Spatial Reuse.
질문 # 30
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