300-420 · Question #21
An enterprise customer has these requirements: - end-to-end QoS for the business-critical applications and VoIP services based on CoS marking. - flexibility to offer services such as IPv6 and…
The correct answer is D. VPLS. VPLS (Virtual Private LAN Service) is the correct answer because it satisfies all three requirements. It operates at Layer 2 and provides a full-mesh logical topology across all sites in the VPN, fulfilling the Layer 2 full-mesh requirement. Because VPLS delivers a transparent…
Question
An enterprise customer has these requirements:
- end-to-end QoS for the business-critical applications and VoIP
services based on CoS marking.
- flexibility to offer services such as IPv6 and multicast without any
reliance on the service provider.
- support for full-mesh connectivity at Layer 2.
Which WAN connectivity option meets these requirements?
Options
- AVPWS
- BMPLS VPN
- CDMVPN
- DVPLS
How the community answered
(27 responses)- A7% (2)
- B33% (9)
- C11% (3)
- D48% (13)
Explanation
VPLS (Virtual Private LAN Service) is the correct answer because it satisfies all three requirements. It operates at Layer 2 and provides a full-mesh logical topology across all sites in the VPN, fulfilling the Layer 2 full-mesh requirement. Because VPLS delivers a transparent Ethernet service, the customer retains complete control over Layer 3 protocols including IPv6 and multicast without any dependency on the service provider's routing capabilities. CoS (Class of Service) markings in Ethernet frames are preserved end-to-end, enabling customer-driven QoS policies. VPWS (A) is point-to-point Layer 2, not full-mesh. MPLS VPN (B) is a Layer 3 service where the SP controls routing, and multicast/IPv6 support depends on SP configuration. DMVPN (C) is an overlay tunnel solution that operates at Layer 3 and does not provide native Layer 2 full-mesh connectivity.
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