Juniper JN0-650 Exam With Confidence Using Practice Dumps

When integrating a QFX Series switch into an EVPN-VXLAN IP fabric, specific BGP and EVPN hierarchy configurations are required to establish the control and data planes:

EVPN Encapsulation (Option A): In Junos OS, the encapsulation vxlan statement must be explicitly configured under the protocols evpn hierarchy. This defines that the EVPN control plane will use VXLAN as the data plane encapsulation method rather than MPLS.

BGP Address Family (Option C): EVPN uses Multiprotocol BGP (MP-BGP) to distribute reachability information. For the control plane to function, you must enable the EVPN signaling address family under the BGP protocol using the command set protocols bgp group < name > family evpn signaling.

Incorrect Options: Option B is incorrect because family vpls is used for traditional VPLS signaled by BGP, not for EVPN-VXLAN. Option D is incorrect because while the loopback interface must be reachable, it is typically advertised via an IGP (like OSPF or IS-IS) to provide the underlay connectivity that BGP then rides upon; BGP itself does not " advertise " the loopback to establish the initial peerings.

In this scenario, the requirement is to authenticate devices based on their MAC addresses using a centralized database.

MAC RADIUS (Option A): This is the standard Juniper method for authenticating " headless " or non-802.1X capable devices based on their hardware (MAC) address. The switch acts as a proxy, sending the device ' s MAC address as the username and password to a centralized RADIUS server (the centralized database). If the MAC address is found in the server ' s database, the device is granted access to the network. This perfectly matches the user ' s requirement for MAC-based authentication and a centralized database.

Captive Portal (Option B): This is a web-based authentication method requiring user interaction (login via a browser), which is not based on MAC address identification for the initial authentication phase.

Supplicant Modes (Options C & D): These define how multiple devices are handled on an 802.1X-enabled port, but they are not authentication methods themselves; they rely on 802.1X (EAP-based) or MAC-RADIUS being already configured.

This scenario describes the standard transition of Class of Service (CoS) metadata from the network edge to the network core.

MF vs. BA Classification: Edge devices use Multifield (MF) classifiers because incoming traffic often lacks markings. MF classification assigns traffic to an internal forwarding class based on multiple fields (IPs, ports, etc.). Core devices use Behavior Aggregate (BA) classifiers because they are faster; they only look at the CoS bits (like DSCP) in the header to determine the forwarding class.

The Problem: Internal forwarding class assignments made by an MF classifier on the edge device do not automatically travel with the packet. If the packet leaves the edge device with its original (potentially zeroed) DSCP bits, the core device ' s BA classifier will not be able to identify the priority.

The Solution (Option A): You must implement rewrite rules on the egress interfaces of the edge devices. A rewrite rule takes the internal forwarding class and loss priority assigned by the MF classifier and " writes " the corresponding DSCP value into the packet header as it exits toward the core. This ensures that the core device sees the correct DSCP marking and can apply the appropriate BA classification.

Incorrect Options: Rewrite rules are strictly an egress function to modify the packet for the next hop. Applying them on ingress (Option B) or core ingress (Option C) does not solve the problem of ensuring the packet header reflects the classification logic used during the internal switching process of the edge device.