JN0-460 Exam Dumps - Juniper JNCIS-MistAI Questions and Answers

Anorganization-level configuration templatecan only be applied tosite groups, not to individual sites.

Therefore, a single site such as Site A cannot be directly specified inside an org-level template.

According to Juniper Networks' EVPN documentation, an EVPN Type 4 route, also known as an Ethernet Segment route, is a critical component of the BGP EVPN control plane used specifically in multihoming scenarios. When a Customer Edge (CE) device is connected to two or more Provider Edge (PE) routers via a Link Aggregation Group (LAG), these PE routers must coordinate to manage traffic flow and prevent network loops.

The primary purpose of the Type 4 route is to enable Designated Forwarder (DF) election. In a multihomed Ethernet Segment (identified by a unique Ethernet Segment Identifier or ESI), only one PE router—the Designated Forwarder—is permitted to forward Broadcast, Unknown unicast, and Multicast (BUM) traffic from the EVPN core to the CE device. Without this election process, multiple PE routers would forward the same BUM packets to the CE, leading to traffic duplication and potential broadcast storms.

The workflow begins when a PE router is configured with an ESI on a physical or logical interface; it then generates and advertises a Type 4 route to all other PE routers in the network. This route carries the ESI and an "ES-import" extended community, which allows other PEs connected to the same segment to automatically discover their peers. Once these "peering" PEs are discovered, they collectively execute a DF election algorithm—such as the default modulo-based algorithm or the newer preference-based algorithm—to select the DF and Backup Forwarder (BDF) for each VLAN or bridge domain. By ensuring a deterministic and synchronized selection of the forwarder, Type 4 routes provide the foundational stability required for active-active and active-standby multihoming in modern campus and data center fabrics.

Creating a new site requires asite nameandtime zone.

Other parameters (like templates or location data) are optional but recommended for proper reporting.

According to Juniper Mist documentation, Wired Service Level Expectations (SLEs) are designed to provide operational visibility into the wired experience by monitoring Juniper EX and QFX Series switches. These SLEs leverage pre-connection and post-connection performance metrics to ensure network reliability and performance.

Pre-connection metrics are specifically focused on the initial phase of a client's journey to join the network. These metrics show the total number and the time required for successful connects and authentication. By tracking 802.1X events and DHCP snooping data, Mist can identify if clients are failing to onboard due to RADIUS issues, authentication timeouts, or failures in the DHCP binding process. This allows administrators to proactively address onboarding hurdles before they impact the broader user base.

Post-connection metrics, conversely, measure the network experience once a client is already "on the wire" and attempting to pass data. These metrics primarily measure throughput and focus on detecting various network errors and operational anomalies. Specifically, post-connection monitoring detects issues such as Spanning Tree Protocol (STP) loops, interface errors, and congestion. Additional post-connection insights include identifying cable issues, negotiation failures, and MTU mismatches that might occur during active data transmission.

In summary, Juniper Mist divides its telemetry into these two distinct categories to simplify troubleshooting. Pre-connection metrics ensure that users can get on the network, while post-connection metrics ensure that the network can sustain their traffic requirements without errors. This combined approach enables the Mist AI-driven Predictive Analytics and Correlation Engine (PACE) to provide a holistic view of the end-user experience, moving beyond traditional "up/down" monitoring to a deeper understanding of the quality of the client experience.

Syslogis the standard method for exporting Mist AI event and telemetry messages to third-party collectors.

It supports both UDP and TCP delivery for centralized log correlation.

Dynamic Port Configuration (DPC)in Juniper Mist enablesautomatic switch port configurationbased on connected device type (e.g., phones, access points, printers). When setting up DPC, administrators define thematching criteria(such as MAC OUI or LLDP system name) and associate aConfiguration Profilethat determines which settings are applied.

“To configure Dynamic Port Configuration, you must assign the ports where DPC will run and select the configuration profile that defines how the port will be automatically configured when a matching device is detected.”

Option A:Correct— you must select the configuration profile to apply once the device type matches.

Option B:Incorrect — DPC does not use polling; it reacts to real-time LLDP/device discovery.

Option C:Correct— you must assign the ports on which DPC operates.

Option D:Incorrect — DPC is supported across EX models running compatible firmware but does not require manually setting a Junos version in configuration.

Juniper Mist Wired AssuranceprovidesAI-driven operational visibilityfor EX and QFX switches. It defines and tracksService Level Expectations (SLEs)across multiple performance areas including connectivity, throughput, and switch health.

“Wired Assurance uses AI and telemetry to deliver operational visibility, track service level expectations (SLEs), and monitor throughput, successful connects, and switch health through pre- and post-connection metrics.”

Option A:Correct— accurately describes the full scope of Wired Assurance.

Option B:Incorrect — Wired Assurance provides SLEs specifically for EX and QFX switches.

Option C:Incorrect — both pre- and post-connection SLEs are monitored.

Option D:Incorrect — Wired Assurance monitors both connectivity and device health.

Link Layer Discovery Protocol (LLDP)is a Layer 2 discovery protocol that allows network devices to advertise identity and capabilities to directly connected neighbors. While LLDP is useful for basic topology discovery, it has two key limitations inWired Assurance client identification:

“LLDP operates at Layer 2 between directly connected devices and must be explicitly enabled on all participating network elements to provide neighbor information. It cannot discover devices beyond the first physical hop.”

Option A:Correct— LLDP must beconfigured and enabledon each network device to function.

Option B:Incorrect — LLDP itself is scalable but limited to direct adjacency.

Option C:Correct— LLDP only worksbetween directly connected devices.

Option D:Incorrect — not all clients support LLDP; however, the question asks forlimitations of using LLDP, not lack of support.

According to Juniper Networks' software licensing documentation, Juniper utilizes a tiered subscription model for its Junos OS features on EX and QFX Series switches, specifically designed to align with different network use cases. This model is categorized into three main tiers: Standard, Advanced, and Premium. While basic Layer 2 and Layer 3 functions are included in the base or Standard tiers, advanced fabric technologies are reserved for the highest tier.

The Premium License is explicitly required to enable the full EVPN-VXLAN protocol stack on Juniper switches within a campus or data center fabric. As detailed in the Juniper Licensing User Guide, the Premium license serves as a superset that includes all functionality from the Standard and Advanced tiers, while specifically unlocking the advanced routing and virtualization features necessary for modern fabrics. Specifically, this license entitles the user to configure and run Multiprotocol BGP (MP-BGP) with the EVPN address family—which acts as the control plane—and the VXLAN encapsulation required for the data plane.

In a Juniper Mist Wired Assurance environment, there is a clear distinction between the cloud-based management subscription and the local Junos OS license. While the Wired Assurance subscription provides the AI-driven visibility, SLE monitoring, and automation capabilities through the Mist cloud, the Junos OS Premium license is a prerequisite on the physical hardware to execute the EVPN-VXLAN commands and maintain compliance with Juniper's End User License Agreement (EULA). For instance, on platforms like the EX4650 or QFX5120, attempting to commit a configuration involving EVPN without the appropriate Premium Feature License (PFL) will result in system warnings and protocol limitations, as these features are considered "high-value" software capabilities intended for complex, multitenant campus environments.

InMist Cloud,site variablesare used to store and reference common configuration values (such as VLAN IDs, subnet addresses, or gateway IPs) that are reused across multiple devices and templates within a site.

“Site variables allow administrators to define reusable configuration parameters that can be referenced in multiple templates or device configurations, ensuring consistency and reducing manual errors.”

Option A:Incorrect — applies configuration directly, not reusable references.

Option B:Correct— site variables enable you to reference the same VLAN or value in multiple configurations (switches, WLANs, etc.).

Option C:Incorrect — WLAN templates are for wireless SSID configuration.

Option D:Incorrect — switch templates define static configuration but don’t store shared variables.