Practice Free JN0-452 Exam Online Questions
In a Juniper Mist deployment using Multiple‑PSK and WxLAN Policy, which activities occur before a guest user successfully reaches the captive portal? Choose three.
- A . 802.11 open authentication followed by association
- B . Mapping the user’s PSK to a WxLAN policy tag
- C . Marvis proactive alert identifying a “Captive‑portal connection issue”
- D . REST API call that creates a short‑lived guest WLAN object
- E . DHCP exchange that conveys the portal URL through option 43
A, B, E
Explanation:
The user must first authenticate/associate, Mist maps their PSK to the correct WxLAN tag for policy enforcement, and DHCP typically provides captive‑portal details. Marvis alerts and ad‑hoc REST API provisioning can occur later but are not mandatory steps in the normal flow.
A network engineer wants Marvis to make changes such as adjusting AP power or applying RF optimizations without manual approval, but only for warehouse locations.
What is the best way to enable this?
- A . Enable SNMP traps at the site
- B . Apply custom SLE thresholds to those sites
- C . Enable auto-execution for Marvis Actions scoped to warehouse sites only
- D . Configure AP CLI profiles
C
Explanation:
Mist allows admins to configure **site-level Marvis Action automation policies**. Enabling auto-execution **only for warehouse sites** gives control over where Marvis can act independently.
An enterprise wants to integrate Mist with its ServiceNow platform. The goal is to receive real-time alerts when APs go offline and automatically create IT tickets.
Which Mist feature is used in this integration?
- A . Syslog forwarding
- B . BLE triangulation events
- C . REST API with hourly polling
- D . Webhooks with event-based triggers
D
Explanation:
Mist supports Webhooks to push real-time notifications (e.g., AP offline, SLE violations) to third-party platforms like ServiceNow, Teams, or Slack for automated incident handling.
Which two Mist Edge tunnel modes support layer‑2 redundancy for guests? Choose two.
- A . GRE‑over‑IPSec L2
- B . VXLAN‑in‑UDP
- C . L2TPv3 point‑to‑point
- D . CAPWAP L3
- E . SSL VPN L3
A, B
Explanation:
GRE‑IPSec and VXLAN both preserve L2 frames; L2TPv3 is P2P, CAPWAP/SSL are L3.
A technician is analyzing performance metrics of a Mist AP and observes that a large number of Wi-Fi frames are being retransmitted.
Which metric is most directly impacted by this, and what could be a possible cause?
- A . SNR C caused by incorrect password attempts
- B . Retry Rate C caused by interference or poor signal quality
- C . Channel Width C caused by large frame sizes
- D . RSSI C caused by excessive DFS channel switching
B
Explanation:
A high Retry Rate means data frames are failing on the first attempt and need to be retransmitted, often due to interference, collisions, or low SNR. It directly impacts throughput and latency in the network.
What is the purpose of Mist’s Client Journey Timeline feature?
- A . Display system logs of controller uplink status
- B . Show step-by-step logs of client connection events (association, auth, DHCP, etc.)
- C . Monitor Wi-Fi security compliance reports
- D . Control SSID broadcast timers
B
Explanation:
Mist’s Client Journey Timeline shows the client’s full connection path: association, authentication, DHCP, DNS, and SLE metrics. It’s ideal for troubleshooting.
What is the main advantage of using Mist SLEs over traditional network health metrics?
- A . They are user-experience focused and track connection success, not just signal metrics
- B . They measure SNMP uptime per AP
- C . They only apply to the 2.4 GHz band for precision
- D . They replace the need for authentication logs
A
Explanation:
SLEs shift the focus from infrastructure metrics like signal strength to user-centric experience indicators like time to connect and roaming success.
When a Mist AP detects DFS radar, which actions could RRM take that indirectly raise the SLE “Capacity” on the affected radio? Choose two.
- A . Migrate clients to 6 GHz radios
- B . Reduce channel width from 80 MHz to 40 MHz
- C . Temporarily boost transmit power by 6 dB
- D . Re‑select a non‑DFS 5 GHz channel
- E . Initiate a Marvis Minis latency test
A, D
Explanation:
Moving clients to clean bands or changing to non‑DFS channels prevents capacity loss; power hikes can violate reg‑domain; width reduction can shrink capacity; Minis tests do not raise capacity.
Which vBLE antenna array characteristics enhance both user‑engagement push accuracy and asset visibility? Choose two.
- A . Four‑element phased array per AP
- B . 45‑degree AoA resolution or better
- C . 1 W EIRP output power
- D . Integrated omnidirectional beacon
- E . 30 s beacon advertising interval
A, B
Explanation:
More elements and fine AoA give precise positioning; high power, omni beacons, and long intervals don’t.
An IT team at a university is trying to resolve complaints from students who say it takes too long to connect to Wi-Fi. The admin checks the Mist dashboard and finds that the **Time to Connect SLE** is consistently above 4 seconds.
Which tool or capability should they use to identify the exact failure step in the client process?
- A . AP Health Metrics
- B . RRM Power Analysis
- C . Client Journey Timeline
- D . DHCP Server Logs
C
Explanation:
The Client Journey Timeline allows admins to trace each step in a client’s connection attempt―association, authentication, DHCP, DNS―and see where delays occur. It’s the most efficient way to troubleshoot SLE issues like long connection times.