CCIE Service Provider (legacy) — Question 4

For MPLS inter-AS Option B, how many labels are associated with packet forwarding between the VPNv4 ASBR neighbors?

Answer options

• A. 0
• B. 1
• C. 2
• D. 3

Correct answer: D

Explanation

The correct answer is D, as MPLS inter-AS Option B utilizes three labels for packet forwarding: one for the outer label, one for the inner label, and one for the VPN label. The other options are incorrect because they do not account for the complete labeling required for this inter-AS scenario.