Free JN0-460 Practice Test Questions | Know You're Ready for JNCIS-MistAI-Wired

✅ Explanation:

When a switch first connects to the Juniper Mist Cloud, it authenticates using its claimed device serial number and appears in the Inventory page with a status of "Unassigned" . This indicates the switch has successfully established an outbound SSH connection to the Mist cloud (port 2200) but has not yet been mapped to a specific site. A site defines VLANs, port profiles, SLE policies, and other configuration contexts. Until the switch is assigned to a site, Mist does not push any configuration to it, and its status will not change to "Connected" . Once you select the unassigned switch and assign it to a site, Mist deploys the site‑level configuration, and the status transitions to "Connected" .

❌ Why other options are incorrect

A. Rescan QR code
— Incorrect. QR codes are used for Mist Access Points (APs) during initial zero-touch provisioning (ZTP). Switches are adopted via claiming the serial number in the inventory, not via QR codes.

B. Restart each switch
— Incorrect. Restarting does not change assignment status. The switch is already communicating with the cloud; it simply lacks a site assignment. A restart would not resolve this.

C. Troubleshoot with CLI commands
— Incorrect. The show system connections | grep 2200 and show configuration system services outbound-ssh commands are used to verify that the switch can reach the Mist cloud. If the status is "Unassigned," the switch is already connecting successfully. No troubleshooting is needed; assignment to a site is the missing step.

📚 References

Juniper TechLibrary — Switch Adoption Workflow — "After a switch claims successfully, it appears in Inventory as 'Unassigned.' Assign it to a site to complete adoption; status changes to 'Connected.'"

Juniper Mist Adoption Guide for EX Switches— "Unassigned means the switch is communicating with the cloud but not yet bound to a site configuration. Site assignment is mandatory for managed status."

✅ Explanation:

Switch configuration templates in Juniper Mist allow network administrators to define a standardized baseline configuration (VLANs, port profiles, AAA, SNMP, NTP, syslog, etc.) that can be applied to multiple switches across an organization or site. The primary benefit is consistency — ensuring every switch in a given role or location receives identical settings, reducing human error, simplifying compliance, and streamlining changes. When you update a template, all associated switches inherit the change automatically, eliminating the need to manually reconfigure each device.

❌ Why other options are incorrect

A. They improve the performance of switches
— Incorrect. Templates affect configuration consistency and management efficiency, not switch forwarding performance (e.g., throughput, latency). Performance is determined by hardware and Junos forwarding plane.

B. They reduce Junos OS upgrade times
— Incorrect. OS upgrades are independent of configuration templates. Upgrade time depends on image size, device model, and reboot duration. Templates do not accelerate this process.

C. They make it easier to make switch-specific changes
— Incorrect. Templates are designed for shared, consistent settings. Switch‑specific changes (e.g., unique hostname, management IP) are made at the individual device level, overriding the template when necessary. Templates actually discourage per‑device customization to maintain consistency.

📚 References:

Juniper TechLibrary — Switch Templates Overview — "Templates enable consistent configuration across multiple switches, reducing operational overhead and ensuring uniformity."

Juniper Mist Configuration Hierarchy Documentation— "Organization‑level templates provide a baseline; site‑level and device‑level overrides allow exceptions while maintaining overall consistency."

✅ Explanation:

Brownfield adoption refers to the process of onboarding switches that are already deployed in a live network (e.g., EX Series switches with an existing configuration). For these switches to successfully connect to the Juniper Mist Cloud and appear in the inventory for assignment, two fundamental network-layer requirements must be met:

DNS Resolution (A):
The switch must be able to resolve the fully qualified domain name of the Mist cloud endpoint (oc-term.mistsys.net). Without proper DNS resolution, the switch cannot locate the server to initiate the connection.

Internet Connectivity (B):
The switch requires a route to the public internet to reach the Mist cloud infrastructure. This is typically achieved via the management port (me0) or an IRB interface (irb.0).

❌ Why the other options are incorrect

C. An imported Configuration Template:
Incorrect. A configuration template is used to apply consistent settings (like VLANs) after the switch is assigned to a site. It is not required for the initial connection or to change the status from "Unassigned" to "Connected".

D. Outbound UDP 1280 access:
Incorrect. Juniper Mist switches communicate with the cloud using outbound TCP port 2200 (SSH). UDP port 1280 is not used for this purpose.

References
Juniper Networks Documentation: "Onboarding brownfield-existing Junos and troubleshooting"
Juniper Networks Documentation: "Greenfield vs. Brownfield Switches"
Juniper Networks Documentation: "Adopting a Juniper EX Switch"

✅ Explanation:

In Juniper Mist, predefined or custom roles can be created with granular permissions. A role named "Post-Install" typically refers to a limited, task‑specific role designed for field technicians or third‑party installers who need to:

Physically install access points (APs) and switches
Claim devices to the organization
Assign devices to sites
Verify basic connectivity (LED status, cloud connection)
However, they should not have access to:
Configuration templates
WLANs, VLANs, port profiles
SLE dashboards or client history
Organization or billing settings

Thus, the Post-Install role is not an admin, read‑only, or help‑desk role — it is a scoped installer role limited to device adoption and placement.

❌ Why other options are incorrect

A. Help‑desk monitoring for all sites
— Incorrect. A help‑desk role would need read‑only access to SLEs, client events, and device status. Post-Install lacks those permissions.

C. Read‑only access to all sites
— Incorrect. Read‑only (Observer) can view configurations and analytics but cannot install/claim devices. That is the opposite of Post-Install.

D. Full access to all sites
— Incorrect. Full access (Admin) includes billing, organization settings, templates, and all configurations — far beyond installation tasks.

📚 Reference

Juniper Mist RBAC Documentation — Defines roles: Admin (full), Observer (read‑only), Installer (claim & assign devices, no config access). The Post-Install role in practice aligns with Installer.

✅ Explanation:

In Juniper Mist, Marvis Actions are AI‑driven insights that proactively identify network issues (e.g., client failures, high latency, DHCP timeouts). When a Marvis Action is shown as "AI Validated," it means Marvis has automatically verified that the condition which triggered the action has self‑resolved — the issue is no longer present in current telemetry data. This reduces manual ticket resolution for transient problems. The validation is based on continuous monitoring of SLE (Service Level Expectation) metrics and device telemetry.

❌ Why other options are incorrect

A. Set to Resolved status — Incorrect. "Resolved" is a manual status set by an administrator, not an AI‑driven verification. AI Validated means Marvis automatically detected the issue cleared.

B. Observed a new issue — Incorrect. That triggers a new Marvis Action, not an "AI Validated" status. Validation occurs after an issue disappears.

C. Observed a recurring issue — Incorrect. Recurrence would generate a new or updated Marvis Action, not a validated status. AI Validated indicates the specific instance has cleared.

📚 Reference

Juniper TechLibrary — Marvis Actions Overview — "AI Validated status indicates Marvis has determined the condition that triggered the action is no longer active based on ongoing telemetry analysis."

✅ Explanation:

In a campus fabric using EVPN-VXLAN:

Centrally-Routed Bridging (CRB) — The Layer 3 gateway (default gateway for VLANs/subnets) resides on the distribution (spine) layer. Access switches handle only Layer 2 bridging.

Edge-Routed Bridging (ERB) — The Layer 3 gateway moves down to the access (leaf) layer. Each access switch provides routing for its locally attached subnets, reducing traffic tromboning through the distribution layer.

Thus, when moving from CRB to ERB, the gateway moves from distribution to access.

❌ Why other options are incorrect

A. from access to distribution— Incorrect. That describes moving from ERB to CRB, the opposite direction.

B. from distribution to core — Incorrect. In CRB, the gateway is at distribution, not core. In ERB, it moves to access, not core.

D. from core to distribution — Incorrect. The gateway never resides at the core in either model. Core handles inter‑distribution routing if multiple fabrics exist, not client gateway.

📚 Reference

Juniper TechLibrary — CRB vs. ERB in EVPN-VXLAN Fabrics — "CRB locates the L3 gateway on the spine (distribution). ERB moves the L3 gateway to the leaf (access) for optimal traffic forwarding."

✅ Explanation:

The Campus Fabric wizard in Juniper Mist enables you to design and deploy EVPN-VXLAN fabrics using a simple, step-by-step workflow. When deploying a 5-stage IP Clos campus fabric using claim codes, the process follows a specific sequence:

Switches Must Be Assigned to the Site First
Before you can launch the Campus Fabric wizard, all switches that will participate in the fabric must already be claimed and assigned to the target site in the Mist inventory . The wizard operates within a specific Mist site context and needs to "see" the switches in that site's inventory to allow you to assign their roles (spine, leaf, access) . You would typically claim the switches using their claim codes and assign them to the site before starting the fabric wizard .

Switches Do Not Need to Be Online When Starting the Wizard
The initial configuration of the fabric topology—defining roles, underlay settings, overlay settings, and physical connectivity—is performed in the Mist cloud . You can design the entire fabric and assign switch roles even if the physical switches are offline or not yet installed . The configuration is staged in the cloud and only pushed to the switches once they come online and connect to the Mist cloud .

❌ Why the Other Options Are Incorrect

A. The switches do not need to be assigned to the site
— Incorrect. Site assignment is a critical prerequisite. The wizard operates within a specific Mist site, and switches must be assigned to that site before the wizard can recognize them for role assignment .

B. The switches must be online when you begin the Campus Fabric wizard
— Incorrect. While switches must eventually be online to receive the configuration, the initial design phase in the wizard can be completed with switches offline. This allows pre-staging of fabric designs before physical installation .

📚 References

ExamTopics JN0-460 Community Discussion — Confirmed correct answers with explanation of prerequisites for Campus Fabric wizard .

Juniper Mist Documentation — Onboarding — Describes claim process and site assignment requirements for switches .

✅ Explanation:

Juniper Mist Dynamic Packet Capture is an automated troubleshooting feature that significantly reduces the time required to diagnose client connectivity issues. It operates without requiring any manual configuration or administrator intervention.

No Configuration is Necessary [A]:
The feature is enabled by default across the Mist platform. When a qualifying client connection failure occurs, the system automatically captures the relevant packets without any need for an administrator to define capture filters, set up span ports, or enable protocols like ERSPAN. This zero-touch operation is a cornerstone of Mist's AI-driven approach to network assurance.

Automatically Attached to Client Events on the Insights Page [B]:
Once a dynamic packet capture is triggered, it is automatically saved to the Mist cloud. The capture is linked directly to the specific client event that caused the failure. On the Insights page, these events are clearly marked with a paperclip icon (📎). Clicking on the event reveals a Download Packet Capture button, allowing engineers to analyze the traffic flow in tools like Wireshark.

❌ Why the Other Options Are Incorrect

C. It must be globally configured at the organization level:
Incorrect. As noted above, no configuration is required at any level (organization, site, or device) for Dynamic Packet Capture to function. It is an always-on, automated system.

D. It is automatically attached to the Affected Items list in the Successful Connects SLE:
Incorrect. While the "Successful Connects" SLE is a primary tool for identifying client issues (such as authentication or DHCP failures), the Dynamic Packet Capture files are attached to the specific client event found in the Client Events section of the Insights page. You navigate from the SLE to the affected client, view their client events, and find the paperclip icon there. The capture is not directly attached to the "Affected Items" list of the SLE itself.

📚 References:

Juniper Networks Documentation: "Dynamic Packet Captures are automatically saved and available for you to download in the Clients Events section of your Insights page."

Juniper Wi-Fi Assurance Data Sheet:"Capture packets for troubleshooting from the Juniper Mist cloud architecture when the system detects a major issue, such as an authorization failure"