Juniper JN0-682 Practice Test - Questions Answers

A) EVPN signaling reduces ARP flooding, while multicast signaling does not. EVPN uses BGP to distribute MAC address information, which can also include IP address bindings, thereby eliminating the need for ARP flooding across the VXLAN overlay. B. EVPN signaling propagates MAC addresses across the network, while multicast signaling does not. In an EVPN environment, MAC address advertisements are distributed via BGP EVPN routes, enabling efficient and scalable MAC address learning and distribution.

EVPN Overview

B) Configure virtual-gateway-accept-data under the IRB interface. This configuration is necessary to ensure that the IRB interfaces on the spine devices can handle traffic destined to the virtual gateway IP address.

D) Configure proxy-macip-advertisement under the IRB interface. This enables the advertisement of proxy MAC/IP routes to remote VTEPs. This is essential in a CRB (Centralized Routing and Bridging) topology to ensure that all hosts, including those connected to the spine devices, have reachability to all IRB interface addresses.

Juniper EVPN Configuration Guide

A) Allowing Junos to dynamically create the virtual MAC address of the IRB interface ensures unique MAC addresses for redundancy and avoids conflicts. C. Configuring both IRB interfaces manually with the same address ensures consistency and helps in creating a redundant Layer 3 gateway setup.

C) Multicast group must match on the VTEPs in the same VXLAN segment to ensure that they can properly participate in the same broadcast domain. D. VNI (VXLAN Network Identifier) must also match to ensure that all VTEPs are part of the same VXLAN overlay network.

B) MPLS EVPN provides for local proxy ARP/ND resolution, which improves efficiency and reduces broadcast traffic. C. MPLS EVPN supports point-to-multipoint connectivity, allowing more flexible and scalable network designs. D. MPLS EVPN facilitates MAC learning in the control plane, which leads to more efficient and scalable network operations.

The Ethernet segment router in EVPN is responsible for preventing BUM traffic from looping back to a multi-homed host. It ensures that BUM traffic is properly handled in scenarios where hosts are connected to multiple leaf nodes.

BGP Additional Paths in EVPN-VXLAN environments enable the advertisement of multiple paths through BGP, which provides faster network convergence in the event of a leaf node link failure. This is especially important in large-scale networks with thousands of MAC addresses.

A) Route distinguishers (RDs) ensure that routes from different clients remain unique within the data center domain by appending a unique identifier to each route, allowing overlapping IP spaces to coexist in the same network.

C) Route targets (RTs) identify the VRF into which the route should be placed. They are used in the import and export policies to control the distribution of routes among different VRFs, ensuring that routes are only shared with the intended VRFs.

Configuring Proxy ARP on leaf devices in an EVPN overlay network enables them to respond to ARP requests on behalf of other hosts. When the leaf device knows the MAC of the intended destination, it can reply to ARP requests with its own MAC address, thus facilitating local resolution and avoiding unnecessary ARP traffic across the overlay.