Which technology is an example of the need for a designer to clearly define features and desired performance when designing advanced WAN services with a service provider?

Which technology is an example of the need for a designer to clearly define features and desired performance when designing advanced WAN services with a service provider?
A . FHRP to remote branches
B . Layer 3 MPLS VPNs secure routing
C . Control protocols (for example Spanning Tree Protocol) for a Layer 3 MPLS service
D . Intrusion prevention, QoS, and stateful firewall support network wide

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Answer: B

Explanation:

VPN is:

.An IP-based network delivering private network services over a public infrastructure.

.A set of sites that are allowed to communicate with each other privately over the Internet or other public or private networks.

The most common implementation of a Layer 3 VPN is MPLS VPN. MPLS is a technology that is used to forward packets over the core network, by doing forwarding decisions that are based on labels. That is sometimes referred to as label switching.

Layer 3 MPLS VPN is the technology that is used to connect multiple customer sites.

MPLS-based VPNs are created in Layer 3 and are based on the peer model.

LAYER 3 SERVICE

Layer 3 MPLS VPNs forward only IP packets. The CE routers become peers of MPLS VPN provider routers. In this case, routing may well be a cooperative venture. Stability of the provider routing, their experience with routing, and speed of provider routing convergence are all valid customer considerations. Layer 3 VPNs can support any access or backbone technology. Service providers can use Layer 3 VPNs as a foundation to provide advanced WAN services.