Exam : NSE5_FWF_AD-7.6
Title : Fortinet NSE 5 - Secure
Wireless LAN 7.6
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1.Scenario: A convention center manages 48 FortiAP devices through a FortiGate integrated wireless
controller. The 5 GHz radios use a shared custom FortiAP profile configured for 80 MHz channels,
DARRP, and automatic transmit power between 14 dBm and 23 dBm. During large events, the WiFi
dashboard shows channel utilization above 85%, high retry rates, and strong average client RSSI, while
client counts remain evenly distributed across the radios. DARRP changes several primary channels, but
neighboring cells continue to occupy overlapping 80 MHz channel blocks and aggregate throughput does
not improve.
A. Retain 80 MHz channels, divide the FortiAP devices between two profiles with separate
primary-channel lists, and reduce the DARRP evaluation interval so congested radios can change
channels more frequently..
B. Create a high-density FortiAP profile using 20 MHz channels, a locally appropriate DARRP channel list,
and lower bounded automatic transmit power to increase channel reuse and reduce excessive cell
overlap..
C. Preserve the existing channel width, lower the AP handoff threshold, and reduce the maximum client
count so FortiGate distributes associations more evenly before channel utilization reaches the current
level..
D. Change the profile to 40 MHz channels, preserve the current transmit-power range, and increase the
DARRP weighting assigned to channel load so the controller avoids the busiest neighboring radios.
Answer: B
Explanation:
B is correct because the evidence shows an RF reuse problem rather than a client-distribution or
signal-strength problem. Each 80 MHz radio consumes four contiguous 20 MHz channels, leaving too few
independent channel blocks for a dense deployment. A 20 MHz design provides more reusable cells,
while an appropriate DARRP channel list and lower bounded power reduce both channel overlap and
oversized contention domains.
Option A may organize primary channels more carefully, but frequent DARRP changes cannot create
additional independent 80 MHz spectrum and can introduce service instability.
Option C addresses association distribution even though the clients are already balanced, and AP
handoff does not reduce contention among neighboring cells using overlapping spectrum.
Option D is an improvement over 80 MHz, but retaining the high power range can preserve excessive
overlap, and channel-load weighting alone cannot provide the reuse efficiency of the narrower-channel
design.
2.Scenario: A manufacturing plant operates FortiAP devices near automated welding systems and
variable-frequency motor drives. During production cycles, clients associated with one 5 GHz radio
maintain an RSSI near -53 dBm, but their MCS values fall sharply and transmit retries increase. FortiGate
monitoring shows that the radio noise floor rises from approximately -93 dBm to -62 dBm during the same
periods, while authentication latency, client count, and wired uplink utilization remain normal. DARRP is
enabled, but every channel currently permitted by the radio profile is affected during the production cycle.
A. Configure a per-FortiAP transmit-power override near the regulatory maximum and retain the current
channels so the stronger downlink signal produces a larger margin above the measured noise floor..
B. Increase the ARRP weighting for channel load, reduce the weighting for noise floor, and shorten the
DARRP schedule so the radio reacts primarily to client contention rather than intermittent external
energy..
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