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| Section | Weight | Objectives |
|---|---|---|
| Mobility | 25% | - Site Tags - Optimize client roaming - Validate mobility tunneling - Design mobility groups |
| WLAN High Availability | 20% | - Design AP high availability - Design controller high availability |
| Wireless Site Survey | 25% | - Pre-deployment site survey - Post-deployment site survey - Collect design requirements and evaluate constraints - Planning tools and network metrics evaluation - Material attenuation and its design effects - Layer 1 site survey analysis - Predictive site survey |
| Wired and Wireless Infrastructure | 30% | - Physical infrastructure requirements - Design high-density wireless networks - Design for data, voice, video, location - Design wireless bridging (mesh) - Logical infrastructure requirements - Design radio management |
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NEW QUESTION # 58
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?
Answer: A
Explanation:
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.
NEW QUESTION # 59
An engineer is deploying new APs to serve IEEE 802.11g through 802.11ac clients and wants to use the Ekahau Site Survey tool to verify RF coverage. Management wants the engineer to verify and create coverage maps as quickly as possible. Which configuration accomplishes the goal?
Answer: C
Explanation:
In Ekahau Site Survey, passive mode involves listening to beacon frames and probe responses from deployed APs without the survey laptop actively associating to any SSID. This is significantly faster than active mode because no association, DHCP, or throughput test overhead is introduced - the surveyor simply walks the floor while Ekahau passively captures signal strength data from all visible APs simultaneously. Using two wireless adapters in passive mode provides a critical speed advantage: one adapter scans 2.4 GHz channels while the second adapter simultaneously scans 5 GHz channels. Without dual adapters, a single adapter must time-multiplex between bands, reducing the sample rate per band and either slowing the survey walk or producing sparser data. Active mode (Options B and C) is used when throughput measurements are required for specific application validation such as voice or video, but it is inherently slower due to association overhead and sequential testing. The combination of passive scanning and dual adapter configuration delivers the highest possible data collection rate per unit of walk time. Reference: WLSD Study Guide - Ekahau Site Survey Modes, Passive vs. Active Survey Methodology, Multi-Adapter Survey Configuration.
NEW QUESTION # 60
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?
Answer: B
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?5 dB depending on density and depth.
NEW QUESTION # 61
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?
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.
NEW QUESTION # 62
A customer has two Cisco wireless controllers named WLC-A and WLC-B. Each controller is in a different building on a campus. The WLCs have different Layer 3 interfaces and broadcast the same SSIDs from their respective APs. Users must remain connected to the same VLAN and maintain their IP addresses during roaming from the APs attached to WLC-A and WLC-B. Which action accomplishes the requirement?
Answer: D
Explanation:
The requirement for users to retain their VLAN assignment and IP address when roaming between buildings managed by different WLCs is a Layer 3 roaming scenario. In Cisco's wireless architecture, IP address preservation across controller boundaries is achieved through inter- controller mobility -- specifically the foreign-anchor mobility tunnel mechanism. When a client roams from Building A (WLC-A) to Building B (WLC-B), WLC-B becomes the foreign controller and WLC-A becomes the anchor controller. WLC-B tunnels the client's traffic back to WLC-A, allowing the client to retain its original IP address even while physically associated to an AP managed by WLC-B. This requires creating a mobility group between WLC-A and WLC-B with both controllers configured with the same mobility group name -- the group name is the trust identifier that permits the mobility tunnel and anchor-foreign relationship to form.
NEW QUESTION # 63
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