Alcatel-Lucent NRS II – Wide Area Network Services — Question 24

Which of the following regarding MPLS Encapsulation is FALSE?

Answer options

• A. The customer's Layer 2 header is preserved at the iLER for Layer 2 services.
• B. The customer's Layer 2 Header is preserved at the iLER for Layer 3 services.
• C. The service provider's Layer 2 header is added at the iLER for Layer 2 services.
• D. The service provider's Layer 2 header is added at the iLER for Layer 3 services.

Correct answer: B

Explanation

The correct answer is B because in Layer 3 services, the customer's Layer 2 header is not preserved at the iLER; instead, it is removed and replaced with the service provider's encapsulation. Options A, C, and D are accurate statements about how MPLS handles Layer 2 and Layer 3 services.