CCIE Service Provider (legacy) — Question 5

Which are the two purposes of the MPLS label value 1? (Choose two.)

Answer options

• A. it is used for MPLS OAM packets.
• B. it indicates an implicit null label.
• C. it is used for VPNv6 packets.
• D. it is used to carry the QoS value in the label stack.
• E. it indicates an explicit null label.
• F. it indicates a router alert label.

Correct answer: C, F

Explanation

The correct answers are C and F because label value 1 is specifically utilized for VPNv6 packets and also serves as a router alert label. The other options describe functions associated with different MPLS labels or misinterpret the role of label value 1.