Alcatel-Lucent NRS II – Frame Relay and ATM Services — Question 12

Which of the following about the VPRN data plane is TRUE?

Answer options

• A. A packet receives a service label and a transport label at the ingress PE.
• B. A packet has its service label swapped at each P router.
• C. The egress PE pops the service label, and the transport label is forwarded.
• D. The service label is popped by the remote CE.

Correct answer: A

Explanation

Answer A is correct because, at the ingress PE, a packet indeed receives both a service label and a transport label for proper routing. Option B is incorrect as the service label is not swapped at each P router; it remains until it reaches the egress PE. Option C misstates the process, as the transport label is not simply forwarded but is relevant to the transport layer. Option D is wrong because the service label is not popped by the remote CE but rather at the egress PE.