350-501 Question #311: Real Exam Question with Answer & Explanation

Question

What is a characteristic of MVPN?

Options

• AIt bypasses the use of MPLS in the service provider core and transmits packets using IP only.
• BIt uses pseudowires to route unicast and broadcast traffic over either a service provider MPLS or
• CIt allows VRF traffic to use the service provider MPLS VPN to route multicast traffic.
• DIt creates GRE tunnels to route multicast traffic over a service provider IP core.

Explanation

Multicast VPN (MVPN) is a technology that extends multicast services to customers connected to an MPLS VPN. Its key characteristic is enabling multicast traffic from a specific VPN Routing and Forwarding (VRF) instance to traverse the service provider's MPLS VPN backbone.

Common mistakes.

• A. MVPN is designed for use with MPLS VPNs, allowing multicast services to leverage the MPLS core, rather than bypassing it.
• B. MVPN primarily focuses on multicast traffic within VPNs and does not typically use pseudowires to route unicast and broadcast traffic; pseudowires are more commonly associated with Layer 2 VPNs.
• D. While some MVPN modes can use GRE, the core characteristic of MVPN is its integration with the MPLS VPN framework, not just creating generic GRE tunnels over an IP core independently of MPLS VPN services.

Concept tested. MVPN characteristics and function

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_mvpn/configuration/xe-3s/imc-mvpn-xe-3s-book/imc-mvpn-overview.html

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