352-001 · Question #348
What are two reasons to choose L2TPv3 over other technologies for a VPN solution? (Choose two.)
The correct answer is A. The VPN solution does not contain MPLS on the network core. D. The VPN solution should be industry-standard.. L2TPv3 is preferred when the provider core lacks MPLS and when an open, standards-based Layer 2 VPN solution is required.
Question
What are two reasons to choose L2TPv3 over other technologies for a VPN solution? (Choose two.)
Options
- AThe VPN solution does not contain MPLS on the network core.
- BThe VPN solution should support Frame Relay to Ethernet pseudowire connections.
- CThe VPN solution requires multipoint Ethernet LAN service.
- DThe VPN solution should be industry-standard.
How the community answered
(29 responses)- A83% (24)
- B7% (2)
- C10% (3)
Why each option
L2TPv3 is preferred when the provider core lacks MPLS and when an open, standards-based Layer 2 VPN solution is required.
L2TPv3 (RFC 3931) tunnels Layer 2 frames directly over IP without requiring any MPLS label switching infrastructure in the core, making it the correct choice when the service provider backbone is a pure IP network.
Heterogeneous pseudowire connections such as Frame Relay to Ethernet are better served by Any Transport over MPLS (AToM) with its interworking features, and in any case this is not a distinguishing reason to choose L2TPv3 over other technologies.
Multipoint Ethernet LAN services (VPLS) require a multipoint architecture that L2TPv3 does not natively provide - L2TPv3 establishes point-to-point pseudowires only.
L2TPv3 is defined in IETF RFC 3931, making it a vendor-neutral industry standard - this allows interoperability between different vendors' equipment, unlike proprietary Layer 2 tunneling solutions.
Concept tested: L2TPv3 use cases and selection criteria
Source: https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsl2tpv3.html
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