Juniper Updated JN0-460 Exam Questions and Answers by lexie

InEVPN-VXLAN,BUM (Broadcast, Unknown unicast, and Multicast)traffic is handled differently than unicast traffic. EVPN provides two main forwarding mechanisms to distribute BUM traffic betweenVTEPs(VXLAN Tunnel Endpoints):

“BUM traffic in EVPN-VXLAN fabrics is replicated using eitheringress replicationorunderlay multicast(PIM-based). Both methods ensure that broadcast and unknown unicast frames reach all remote VTEPs within the same VXLAN segment.”

Option A:Incorrect — static routes are unrelated to BUM forwarding.

Option B:Incorrect — BGP is thecontrol plane, not a data-plane forwarding method.

Option C:Correct—Ingress replicationreplicates BUM packets to all remote VTEPs in the same VNI using unicast tunnels.

Option D:Correct—Underlay replication (multicast)uses multicast groups in the IP underlay to distribute BUM frames efficiently.

According to Juniper Mist documentation, Dynamic Port Configuration (DPC)—also referred to as Dynamic Port Profiles—is the feature specifically designed to automate the assignment of VLANs and port settings based on the type of device connected to a switch. This technology enables the concept of "colorless ports," where any device (such as a Juniper Mist Access Point, an IP camera, or a VoIP phone) can be plugged into any available switch port without prior manual configuration.

The system functions by using "port assignment rules" that leverage various device properties to identify the connected hardware. These properties include LLDP attributes (System Name, Chassis ID, or Description), MAC addresses (including specific OUI ranges), and RADIUS attributes. For example, a rule can be configured to detect an LLDP System Description starting with "Mist Systems" and automatically apply a "Wireless AP" port profile. This profile typically includes the management VLAN, PoE settings, and Spanning Tree Protocol (STP) parameters required for an access point to function.

The primary benefit of DPC is the reduction of manual labor and the elimination of configuration errors in large-scale deployments. In traditional environments, an administrator would have to manually assign a VLAN to a specific physical port; with DPC, the Juniper Mist cloud detects the device and pushes the relevant configuration to the switch in real-time. If the device is disconnected, the port can be configured to revert to a "restricted" or "guest" VLAN, ensuring that the network remains secure against unauthorized access. This AI-driven approach drives consistency across multiple sites while significantly streamlining the onboarding of new hardware.

In Mist,sitesrepresent the physical or logical grouping of devices within an organization.

You create and manage a site configuration under theLocationhierarchy in the Mist UI.

Each site inherits organization-level settings but can override or customize specific configurations such as VLANs, templates, or switch settings.

Creating a new site requires asite nameandtime zone.

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