Practice Free JN0-452 Exam Online Questions
Which sequence correctly describes how Frequency‑band selection, Modulation scheme, and SLE “Latency” interplay during an 802.11ac frame exchange on a Mist‑managed AP? Choose two.
- A . 5 GHz is preferred; higher‑order 256‑QAM reduces airtime, improving the Latency SLE score
- B . 2.4 GHz is forced by band‑steering; MCS selection is ignored, leading to poorer Latency SLE
- C . Client chooses 5 GHz; AP downgrades to BPSK due to low RSSI, increasing airtime and SLE latency
- D . AP disables 20 MHz channels; 64‑QAM is negotiated, keeping Latency SLE within SLA
- E . Band steering is disabled; adaptive bitrate selects 16‑QAM on 2.4 GHz, which Marvis flags as “coverage hole”
A, C
Explanation:
Preferred 5 GHz with high‑order QAM lowers airtime and latency. Conversely, low RSSI forces a robust (low) MCS like BPSK, inflating airtime and harming Latency SLE. Other statements misuse band‑steering logic or misinterpret SLE triggers.
In Mist WLAN, what is the recommended reason for keeping the number of SSIDs low at each site?
- A . To reduce airtime consumption caused by excessive beacon broadcasts
- B . To minimize the total number of VLANs used
- C . To allow 802.1X to function correctly
- D . To improve BLE scanning performance
A
Explanation:
Each SSID increases broadcast overhead by generating periodic beacon frames, which consume airtime and reduce Wi-Fi efficiency. Mist recommends minimizing SSIDs to avoid this.
A logistics team wants to optimize forklift paths inside a warehouse. They use Mist’s path replay feature but find the tracking is sparse and imprecise. The APs are ceiling-mounted every 25 meters.
What is the best recommendation to improve results?
- A . Reduce transmit power of APs
- B . Switch to 2.4 GHz Wi-Fi only
- C . Add more Mist APs to reduce spacing to 10 meters or less
- D . Replace Mist APs with directional antennas
C
Explanation:
For **vBLE-based accurate indoor positioning**, Mist recommends AP spacing of **≤10 meters**. Wider spacing (e.g., 25m) reduces the triangulation quality significantly.
Which pair of WLAN lifecycle phases overlap with account organization tasks when migrating an existing campus to Juniper Mist? Choose two.
- A . Planning C mapping RF coverage and expected SLE goals
- B . Deployment C assigning subscription SKUs to the tenant
- C . Optimization C adjusting RRM based on post‑cutover RF scans
- D . Operations C monitoring site events and Marvis insights
- E . Retirement C revoking unused API tokens from old controllers
B, E
Explanation:
During deployment you bind subscription licenses to the organization, and in retirement you revoke or clean up account‑level items like API tokens. Planning and optimization concern RF/SLE, and operations focus on monitoring, not account structure.
Which elements are critical for Wi‑Fi location accuracy and for *user‑engagement campaigns driven by Mist? Choose two.
- A . Accurate RF calibration maps that include wall attenuation
- B . Assignment of SLE “Capacity” thresholds per floor
- C . Presence of virtual BLE beacons spaced ≤ 10 m apart
- D . Enabling Multiple‑PSK to differentiate staff from visitors
- E . Organization‑level account split across separate tenants
A, C
Explanation:
Heat‑map calibration and a dense vBLE grid are essential for both precise location and proximity‑triggered engagement. SLE capacity, Multiple‑PSK, and tenant structure do not directly influence positional precision or engagement triggers.
Which combination of Mist Edge capabilities and vBLE functionality enables accurate asset‑visibility use‑cases in a warehouse? Choose two.
- A . Local tunnel termination that keeps BLE telemetry on‑premises
- B . Cloud‑based Marvis Minis continuously injecting BLE beacons
- C . Virtual BLE antenna arrays sending calibrated angle‑of‑arrival data
- D . Access‑point PoE ++ budgeting to power external BLE gateways
- E . Organization‑level subscription that enables advanced Location‑based Services licenses
A, C
Explanation:
Mist Edge can locally terminate traffic (including BLE telemetry) to respect data‑sovereignty rules, while the vBLE antenna array supplies high‑resolution AoA data for asset visibility. Marvis Minis analyse―not inject―BLE, PoE++ is power‑related only, and licensing is prerequisite but not a technical enabler.
Which of the following is a key limitation of the 2.4 GHz frequency band in Wi-Fi?
- A . High interference from other devices
- B . High number of non-overlapping channels
- C . Limited signal range
- D . Low data encryption standards
A
Explanation:
The 2.4 GHz band has only three non-overlapping channels and is used by many household devices like microwaves and baby monitors, leading to higher interference. It offers longer range but suffers from congestion and interference, not encryption limitations.
A stadium deployment needs to ensure SLE “Capacity” targets even during half‑time surges.
Which RRM strategies accomplish this? Choose two.
- A . Enforce an 80 MHz channel plan on 5 GHz
- B . Activate dynamic power scaling with a 3 dB step size
- C . Lock 2.4 GHz radios to 20 MHz and C3 dBm EIRP
- D . Rotate secondary channels every 30 minutes via API
- E . Enable band‑steering with a C15 dB RSSI diff threshold
B, E
Explanation:
Dynamic power and aggressive band‑steering relieve congestion and maintain Capacity SLE. 80 MHz reduces channel count, low 2.4 GHz power limits coverage, and constant channel rotation destabilises clients.
After applying a new SSID configuration template to 150 branch sites, several sites begin reporting “no internet” issues. You open Marvis and ask, “What’s wrong with branch clients?” The AI responds: “High DHCP timeout rate at 26 locations after template push.” What likely caused this?
- A . DHCP pool exhaustion at core
- B . Wi-Fi password expiration
- C . Marvis Minis interference
- D . Incorrect VLAN/DHCP mapping in the new template
D
Explanation:
A **bad VLAN to DHCP assignment** is a common issue during config push. Marvis pinpoints this by correlating DHCP failures with the recent change.
What is a key benefit of using Marvis for root cause analysis (RCA)?
- A . It only requires manual CLI inspection
- B . It uses telemetry data and AI to identify likely failure reasons
- C . It triggers firmware updates on APs
- D . It bypasses SLE analysis completely
B
Explanation:
Marvis RCA leverages Mist telemetry and machine learning to pinpoint common issues like DHCP failures, auth errors, or poor signal coverage.