Juniper Updated JN0-253 Exam Questions and Answers by kamari

The duplex mismatch parameter is beyond the scope of Marvis Actions’ Connectivity category. According to the official Juniper Mist documentation, Marvis Actions within the Connectivity category are designed to troubleshoot common network connectivity issues for wireless clients, including DHCP failure, DNS failure, authentication failure, and ARP failure. These actions automatically detect and provide detailed insights about failures most likely to impact client onboarding, IP addressing, and network services. Duplex mismatch, on the other hand, is a wired networking issue where there is a disagreement between network devices (such as switches and end hosts) regarding duplex settings (half-duplex or full-duplex), and it typically causes performance problems like collisions and slow speeds. Marvis's focus for the Connectivity troubleshooting category is wireless protocol-level connectivity and service reachability, so duplex mismatch falls outside its direct scope of detection and automatic remediation.

Thepacket capture featureinJuniper Mist Cloudallows administrators to remotely capture live network traffic from managed devices such as Access Points (APs) or switches for detailed troubleshooting.

According to theJuniper Mist Network Troubleshooting and Diagnostics Guide:

“Once a packet capture session is stopped or completed, the captured data is saved as a downloadable .pcap file that can be analyzed offline using tools such as Wireshark.”

This ensures administrators can inspect packet-level details for issues such as authentication failures, DHCP errors, or connectivity drops. The data is stored temporarily and made available through the Mist UI for download before automatic cleanup.

OptionsB,C, andDare incorrect because captured data is not stored permanently in the cloud, does not trigger automated alerts, and is not discarded immediately. The purpose is to make the data accessible foroffline inspection and analysis.

Therefore, the correct answer isA. It is saved as a downloadable capture file for offline inspection.

In theJuniper Mist Cloud platform, user roles define the scope of permissions that determine what administrative functions an individual can perform within an organization. TheSuper Userrole represents thehighest level of administrative authoritywithin a Juniper Mist organization and carries full control over both organization-wide and site-specific configurations.

According to theJuniper Mist Cloud Administration and User Management documentation, the Super User role is described as:

“The Super User role provides full read and write access across the entire organization. Only Super Users can manage organization-level settings, add or remove other administrators, and assign privileges to users.”

This means that only a Super User canadd new administrators, managesubscription entitlements, configureorganization-level policies, and performfull lifecycle device management. Unlike site administrators, Super Users are not restricted to specific locations—they have unrestricted visibility and control across all sites within the organization.

Therefore, the correct answer isD, since the Super User role is explicitly required toadd administratorsto an organization and perform top-level management operations.

InJuniper Mist Wireless Assurance,Service Level Expectations (SLEs)are key metrics that measure different aspects of the end-user experience. Each SLE focuses on a distinct area of network performance such asConnection,Roaming,Throughput, andCoverage.

TheCoverage SLEspecifically measures whether wireless clients are receiving adequate signal strength (RSSI) and signal quality (SNR) from access points. According to theJuniper Mist AI Operations and SLE Analytics Guide, this metric is defined as:

“The Coverage SLE quantifies the percentage of client sessions that meet the required signal strength and quality thresholds. Low coverage indicates areas with weak or inconsistent RF signal levels.”

When users experienceweak signal or dead zones, theCoverage SLEprovides insight into where and why these issues occur. Mist AI identifies sub-classifiers such asSignal Quality,Wi-Fi Interference, orAirtime Utilization, allowing administrators to isolate the cause of poor signal conditions.

Therefore, in the exhibit shown, an administrator would investigate theCoverage SLE (79%), as it directly relates to signal weakness or RF coverage problems.