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

Answer: C

Explanation:

This answer is an example that show that the designer did not clearly defined his needs because the SP gave a L3 service when L2 was needed. In other dumps from Internet answer is B and I think it is right, because designer must be sure that SP provides secure routing service with needed performance, but how control protocols works inside SP net designer.

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