4A0-114 practice question 3 of 10

Which of the following statements about EVPN services is FALSE?

Full set: 44 questions
Answer options
A: The goal of an EVPN service is to provide layer-2 or layer-3 connectivity among two or more customer sites.
B: A local layer-2 EVPN service is referred to as a backhaul VPLS. Correct answer
C: The same BGP address family can be used to populate the forwarding database of an EVPN VPLS and the route table of an EVPN VPRN.
D: EVPN services support signaling for the use of MPLS and VXLAN tunnels.
Correct Answer:
B. A local layer-2 EVPN service is referred to as a backhaul VPLS.
Explanation

EVPN is a versatile control plane that provides Layer 2 (VPLS-like) and Layer 3 (VPRN-like) connectivity using BGP. It uses a single BGP address family (AFI=25, SAFI=70) to advertise different route types for both L2 MAC addresses and L3 IP prefixes. EVPN is data plane agnostic, supporting encapsulations like MPLS and VXLAN. However, the term "backhaul VPLS" is a specific Nokia application referring to a VPLS service used for transport, often for mobile backhaul, and is not a standard term for a "local layer-2 EVPN service". A local EVPN service is simply an E-LAN or E-Line within a single site or data center.

Why Incorrect

A. This is the fundamental goal of EVPN: to provide flexible L2 and L3 VPN services over a common MPLS or IP network.
C. The EVPN BGP address family (L2VPN/EVPN) carries various route types, including MAC/IP routes (Type-2) for VPLS FDBs and IP Prefix routes (Type-5) for VPRN route tables.
D. EVPN is a control plane that is independent of the data plane encapsulation. It explicitly supports signaling for both MPLS and VXLAN tunnels.

References

1. Nokia 7750 SR OS Services Guide, Release 21.10.R1, "EVPN for VPLS services", Section: Introduction to EVPN. "Ethernet VPN (EVPN) is a BGP control plane solution for Ethernet services."

2. IETF RFC 7432, "BGP MPLS-Based Ethernet VPN", Section 1, Page 4. "This document specifies the procedures for BGP MPLS-based EVPNs."

3. IETF RFC 8365, "A Network Virtualization Overlay Solution Using Ethernet VPN (EVPN)", Section 1, Page 3. "This document describes a solution for network virtualization overlays (NVOs) using EVPN."

4. Nokia 7750 SR OS Services Guide, Release 21.10.R1, "VPLS", Section: Backhaul VPLS. This section describes backhaul VPLS as a specific application, distinct from the general definition of an EVPN service.

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