VXLAN (Virtual Extensible LAN) uses an overlay encapsulation method to carry Layer-2 frames over an IP underlay. This functionality is part of the data plane, which is responsible for packet forwarding and encapsulation/decapsulation.
"In an EVPN-VXLAN fabric, the control plane (via BGP EVPN) learns and advertises MAC and IP information, while the data plane encapsulates and forwards traffic using VXLAN tunnels between VTEPs." Option A is incorrect: IP learning happens in the control plane, not the data plane.
Option B is incorrect: MAC advertisement is done in the control plane through EVPN route types.
Option D is incorrect: MAC learning is handled by EVPN control plane, not the VXLAN data plane.
Option C is correct: the VXLAN data plane encapsulates the traffic in UDP tunnels between VTEPs.
References:
Juniper Mist AI for Wired - EVPN-VXLAN Overview
Juniper Validated Design - EVPN-VXLAN Control and Data Plane Separation Junos OS EVPN-VXLAN Deployment Guide

According toJuniper Mist Wired Assurance documentation, three built-in diagnostic tools available for testing switch functionality areBounce Port,Ping, andCable Test.
Bounce Portallows you to disable and re-enable a port to reset connectivity.
Pingverifies Layer 3 reachability between the switch and target IPs.
Cable Testperforms diagnostics to detect wiring faults, impedance mismatches, or cable lengths.
These tools are accessed directly from theSwitch Testing Toolssection in the Mist dashboard and are available for EX Series and QFX Series switches onboarded to the Mist cloud.
References:Juniper Mist Wired Assurance - Switch Testing Tools Documentation

The exhibit shows:
L2 gateways (blue dots)positioned at the distribution layer.
L3 gateways (red dots)positioned at thecore layer.
EVPN/VXLAN providing fabric connectivity between layers.
Access switches forwarding traffic into the fabric without acting as gateways.
This directly maps to thecentrally-routed bridging (CRB)model, where:
Bridging occurs at the access/distribution layer.
Routing (L3 gateway) occurs centrally at the core layer.
"In the core-distribution CRB model, Layer 2 gateways are deployed at the distribution switches, and Layer 3 gateways are deployed centrally at the core switches." Option A (ERB)is incorrect because ERB places the L3 gateway at the edge/access.
Option B (5-stage IP Clos)is incorrect - that topology has a leaf/spine architecture, not core/distribution.
Option C (3-stage IP Clos)is incorrect - that eliminates the distribution layer.
Option D (CRB)is correct, matching the diagram exactly.
References:
Juniper Mist AI for Wired - Campus Fabric Architecture Guide
Juniper Validated Design - Campus Fabric EVPN-VXLAN Deployment Models
Junos OS EVPN Campus Deployment Examples