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

✅ Explanation:

LLDP (Link Layer Discovery Protocol) is a standard layer 2 protocol used by network devices to advertise their identity and capabilities. To identify wired clients, Mist Wired Assurance and other management platforms rely on LLDP information received from switches. However, LLDP has two significant limitations as a client identification method:

A. It requires LLDP to be configured on network devices
— LLDP is not enabled by default on many network devices (though Mist-managed switches with Wired Assurance do enable it). Administrators must explicitly configure LLDP on legacy or non‑Mist devices for the protocol to function. Without LLDP enabled, devices cannot advertise or receive neighbor information, making client identification impossible.

C. It only operates between directly connected devices
— LLDP frames are not forwarded beyond the immediate physical link. A switch can only see LLDP information from a device directly connected to one of its ports. It cannot discover devices two hops away. This means end hosts (desktops, printers, phones) must support and send LLDP advertisements for the switch to identify them — which many do not.

❌ Why other options are incorrect

B. It is not scalable to large networks
— Incorrect. LLDP is actually quite scalable. It operates locally per port with minimal overhead (frames sent every 30 seconds by default). Large networks with thousands of switches handle LLDP without issues. Scalability is not a meaningful limitation.

D. It is supported by all wired client devices
— Incorrect. This statement is false, but it represents a limitation of LLDP. In fact, many client devices (legacy printers, IoT sensors, some desktop OSes) do not support LLDP. The limitation is that LLDP is not universally supported. However, the question asks for limitations, and option D is phrased as a false positive statement. The correct limitation is the lack of universal support, but the option says "supported by all," which is incorrect as a statement of fact, not a limitation. The exam expects you to recognize that requiring LLDP configuration (A) and only working on direct links (C) are the two valid limitations.

📚 References:

Juniper TechLibrary — Wired Assurance Client Identification — "LLDP provides neighbor discovery but requires configuration on participating devices and only identifies directly connected neighbors."

IEEE 802.1AB (LLDP Standard) — Defines LLDP operation as link‑local only; frames are not forwarded beyond the immediate segment.

✅ Explanation:

A 5-stage IP Clos network is an extension of the classic 3-stage Clos (leaf-spine) architecture. In a 3-stage Clos, every leaf (access) connects to every spine (distribution). When campus networks grow beyond the port density or scaling limits of a single spine layer, a 5-stage Clos adds:

Super-spine layer — Connects multiple spine blocks together.
Resulting stages — Access (leaf) → Distribution (spine) → Core (super-spine) → Distribution → Access.
Thus, the architecture supports large-scale campus deployments by enabling north-south and east-west traffic to scale horizontally across many spine blocks. Juniper Mist supports this model for EVPN-VXLAN fabrics in very large campuses or multi-building deployments.

❌ Why other options are incorrect

A. A routing protocol
— Incorrect. A 5-stage IP Clos is a physical/logical topology, not a routing protocol. Routing protocols (e.g., EBGP, OSPF) may run over it, but they are not the definition.

B. A type of EVPN tunnel encapsulation
— Incorrect. EVPN tunnel encapsulation refers to VXLAN, Geneve, or MPLS. The Clos architecture describes how switches are interconnected, not how tunnels are encapsulated.

C. A hierarchical architecture with distribution, core, and access layers
— Incorrect. This describes a traditional 3-tier campus design (access-distribution-core), which is not a 5-stage Clos. Traditional 3-tier has different switching logic (STP, VPC, etc.) and lacks the Clos properties (full mesh between stages, non-blocking fabric).

📚 Reference:

Juniper TechLibrary — Campus Fabric Architecture Overview — "A 5-stage Clos extends the 3-stage model by adding a super-spine layer, enabling large-scale campus deployments beyond the scaling limits of a single spine block."

Juniper Design Guide — EVPN-VXLAN Fabric — Diagrams distinguish 3-stage (leaf-spine) from 5-stage (leaf-spine-super-spine) Clos networks.

✅ Explanation:

In the Juniper Mist dashboard, the Alerts Configuration section is the dedicated, centralized location for setting up all types of notifications . This is where you configure the rules that define which network events (e.g., a switch going offline, high CPU usage, or a port status change) should trigger an alert, and specify the notification channels—such as email, SMS, or webhooks—that will be used to deliver them .

To set up email notifications for switch issues, you would navigate to Monitor > Alerts and click the "Alerts Configuration" button. Within this configuration, you define the scope (e.g., the entire organization or a specific site) and list the email recipients who should be notified .

❌ Why the other options are incorrect

A. Marvis conversational interface
— Incorrect. Marvis is Juniper's AI engine, used for natural language queries, proactive insights, and troubleshooting via the Marvis Actions and Virtual Network Assistant (VNA) . It is not the tool for configuring email distribution lists for alerts.

B. Wired SLEs
— Incorrect. Service Level Expectations (SLEs) are used to define and monitor performance thresholds for specific metrics (e.g., "Successful Connects" or "Throughput") . While you can monitor SLE violations, the central policy for sending email alerts about switch issues is not configured directly within the SLE menu.

D. Marvis Actions
— Incorrect. Marvis Actions proactively identify and explain the root cause of network issues, presenting them in a prioritized list . While they provide valuable insight, the configuration of notifications to deliver this information via email is handled in the Alerts Configuration section.

📚 Reference:

Juniper Mist Documentation
— Alert Framework — "The Alerts page on the Mist dashboard will help you maintain full and constant visibility across your sites... You may also configure alerts to receive Email notifications for certain types of events detected on your network" .

Juniper Support Portal — How to Configure Alerts — Describes enabling alerts and e-mail notifications for infrastructure events, explicitly directing users to Monitor > Alerts > Alerts Configuration to set up the alert rules and email recipients .

✅ Explanation:

In the context of Wired Assurance, "configuration automation" refers to the ability to programmatically manage network devices without manual, per-switch CLI commands. The two unique advantages that enable this are:

A. 100% open APIs
The Juniper Mist platform is built on a 100% programmable, API-first architecture . Every feature visible in the Mist UI can be accessed and automated via comprehensive REST APIs . This openness allows seamless integration with third-party systems like ServiceNow and Splunk for automated ticketing and troubleshooting, and prevents vendor lock-in .

C. Programmable workflows
Building on the open APIs, Mist enables the creation of sophisticated, multi-step automation scripts . You can develop workflows that automatically provision a new switch, assign it to a site, apply configuration templates, and validate operations—all without manual intervention . This transforms static configurations into dynamic, intent-based automation.

These two capabilities work together: the open APIs provide the interface, and programmable workflows provide the logic to orchestrate complex automation tasks.

❌ Why the other options are incorrect

B. client SLEs — Incorrect. Service Level Expectations (SLEs) are monitoring and visibility features that track metrics like throughput and successful connects . While valuable for assurance, they are not a configuration automation advantage; they are observability tools .

D. switch insights — Incorrect. Switch insights provide visibility into switch health metrics (CPU, memory, temperature, port status) . Like SLEs, insights are a Day 2 operations feature for monitoring, not a mechanism for automating configuration changes .

📚 References

Juniper Wired Assurance Official Page — "Open APIs means no vendor lock-in. Harness the power of 100% open and programmable APIs to fully automate switch activation, onboarding, and configuration."

✅ Explanation:

When a switch is claimed in a Mist organization using an activation (claim) code, it is added to the Organization's inventory. At this stage, the switch has been "introduced" to the cloud but has not yet completed the full onboarding process, leading to two specific and simultaneous device states in the Mist dashboard: Active and Unassigned.

C. Active:
The "Active" status is a critical concept in the Mist inventory. A switch can be Active without being connected to the cloud . The term "Active" in the inventory indicates that the device has been claimed and exists within the organization's asset list, distinguishing it from an "Inactive" device which has been removed or never claimed. A switch is considered claimed as soon as the activation code is entered, making it "Active" in the organization even before it is physically online and communicating.

D. Unassigned:
Immediately after claiming, the switch is placed in the global organization inventory but has not yet been mapped to a specific Site (e.g., "Building A" or "Data Center 1") . A site defines the configuration context (VLANs, port profiles, etc.), so until it is assigned to one, the switch remains in this "Unassigned" pool. Official documentation confirms that after claiming, the switch appears in the Inventory page with the status Unassigned .

To achieve a status of Connected (Option A), the switch must not only be claimed and assigned to a site but also physically powered on and able to establish an outbound SSH connection to the Mist cloud (TCP port 2200).

❌ Why the Other Options Are Incorrect

A. Connected: This is incorrect as an immediate result of the claim process. A switch can only show as "Connected" after it has been both claimed and assigned to a site, and it has successfully established a network connection to the Mist cloud. Immediately after entering the activation code, the switch is in the inventory but almost certainly not yet physically connected to the network .

B. Inactive: This is incorrect. "Inactive" generally refers to a device that has been removed or unclaimed from the organization, or a license that has expired. Claiming a switch using an activation code explicitly makes it "Active" in the inventory .

📚 References

Juniper Official Documentation (Claim a Switch): Confirms the steps to claim and notes that switches are added to the Inventory .

Juniper Support Portal: States explicitly: "You will need to assign it to a site to configure it," confirming the Unassigned state after claiming .

✅ Explanation:

The Client Events section on the Insights page in Juniper Mist is a chronological log of every significant interaction between a client and the network. This includes both successful (Good) events and failed (Bad) events. The platform automatically logs events related to the core phases of network connectivity: Association, Authentication, (Reassociation), and IP Address Management (DHCP).

A. Reassociation:
This occurs when a client device moves between Access Points (APs) within the same network (roaming). The client sends a Reassociation Request to the new AP to maintain its connection without having to fully re-authenticate. This is a standard IEEE 802.11 event and is displayed in the timeline to track client mobility.

D. DHCP Denied:
This is a specific failure event generated when the network's DHCP server sends a DHCP NAK (Negative Acknowledgment) packet to a client. This typically happens when the client requests an IP address that is no longer valid, is already in use elsewhere, or is not allowed by the server's configuration. This event is critical for troubleshooting IP address assignment failures.

❌ Why the Other Options Are Incorrect

B. Restart by User:
The Mist platform does not receive a specific event or notification from a client device indicating that the user manually initiated a restart or reboot. While the device going offline will be detected, the cause cannot be attributed to a "user restart."

C. Reflection (Loop Detection):
This event refers to a network layer issue (Layer 2 loops) typically prevented by protocols like Spanning Tree Protocol (STP) or detected by loop protection features on switches. This is considered a switch/network infrastructure event, not a specific event generated by a client device that would appear in the client's event timeline.

📚 Reference:

Juniper Mist Documentation — Dynamic Packet Captures: States that failing events such as "Reassociation" failures and "DHCP Denied" are shown in the Client Events section.

Juniper Mist Documentation
— Troubleshooting: Confirms that the Client Events page is used to view "Good or Bad events" including DHCP failures and association/reassociation attempts

✅ Explanation:

Webhooks in Juniper Mist provide a real-time, "push" mechanism for sending specific event information from the Mist cloud to an external server. When you configure a webhook, you subscribe to specific topics, which are categories of events. When an event related to one of those topics occurs, Mist immediately sends the relevant data to your designated URL .

The two commonly supported topics for which webhooks can reliably stream information are:

B. Alarms:
You can configure webhooks to send real-time notifications for alarms. These are system-defined events that are typically configured in the Alert Framework on a per-site basis. They include critical issues such as a device going down, authentication failures, or other performance degradations .

D. Audit Logs:
The audit topic allows Mist to stream information in real-time about changes made to the system configuration. This includes actions like creating, updating, or deleting WLANs, sites, and administrator privileges. This allows external systems to track who changed what and when, directly from the Mist Audit Logs .

❌ Why the Other Options Are Incorrect

A. Location coordinates of RFID tags:
While Mist does support location-based webhooks, these are specifically for virtual Bluetooth Low Energy (vBLE) beacons and client location updates, typically triggered by zone entry/exit events. The official documentation does not list raw "RFID tag coordinates" as a standard, out-of-the-box webhook topic. Location data is generally more about assets and BLE clients rather than generic RFID tags .

C. SLE metrics of clients:
Service Level Expectations (SLEs) are metrics (like "Time to Connect" or "Throughput") that are calculated by the Mist cloud . This data is not typically "streamed" in real-time via webhooks. Instead, it is a calculated data point visible in the dashboard and typically retrieved by polling the Mist REST API for specific insights, not pushed by a webhook .

📚 Reference

Juniper Mist Documentation: Setting up Webhooks in Mist
Juniper Mist Documentation: Monitoring Mist with Webhooks
Juniper Mist Documentation: Webhooks for Location

✅ Explanation:

Webhooks are the primary method for forwarding event messages from the Mist cloud to an external log collector . When an event such as an alarm or device status change occurs, Mist uses webhooks to push real-time HTTP notifications to a specified URL . The Juniper Alert Format Relay can then receive these webhooks and convert the data into standard formats—including Syslog and SNMP traps—for integration with legacy monitoring tools . This approach allows Mist to push events as they happen rather than requiring an external system to poll APIs for updates .

❌ Why Other Options Are Incorrect

A. Syslog: Mist does not generate native Syslog streams directly. Syslog is a destination format achieved by first enabling webhooks and converting the data via the Alert Format Relay .

C. NETCONF: NETCONF is used for configuration management (pushing configurations to Junos devices), not for forwarding real-time event messages from the Mist cloud to external collectors.

D. SNMP traps: Mist does not send native SNMP traps. Like Syslog, SNMP trap forwarding requires webhooks and the Alert Format Relay to perform the conversion .

📚 Reference

Juniper Alert Format Relay Overview: "The Juniper Alert Format Relay provides you with Juniper Mist monitoring information by using selected data through webhooks. The information is parsed into pre-defined formats such as SNMP Traps and SYSLOG messages" .

Mist Webhook Monitoring Service Datasheet: "Alert Format Relay converts Mist cloud alerts received via webhooks to SNMP traps and system log messages for seamless integration with existing tools" .