350-501 Question #36: Real Exam Question with Answer & Explanation

Question

Which component is similar to an EVPN instance?

Options

• AMPLS label
• BIGP router ID
• CVRF
• Drouter distinguisher

Explanation

An EVPN instance (EVI) functions similarly to a Virtual Routing and Forwarding (VRF) instance by providing logical separation for customer services on a shared network.

Common mistakes.

• A. An MPLS label is a short, fixed-length identifier used for forwarding packets within an MPLS network; it is a forwarding mechanism, not a logical isolation construct like an EVI or VRF.
• B. An IGP router ID is an identifier for a router within an Interior Gateway Protocol (IGP) domain; it identifies a router, not a customer-specific service instance.
• D. A router distinguisher (RD) is used in MPLS VPNs to make customer VPN routes unique in the global BGP table, but it is a prefix to a route, not an instance of logical isolation like a VRF or EVI.

Concept tested. EVPN instance (EVI) comparison

Reference. https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-6/mpls/configuration/guide/b-mpls-cg-asr9000-66x/b-mpls-cg-asr9000-66x_chapter_010.html

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