Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 59

What are two MPLS label characteristics? (Choose two.)

Answer options

• A. The label edge router swaps labels on the received packets.
• B. Labels are imposed in packets after the Layer 3 header.
• C. LDP uses TCP for reliable delivery of information.
• D. An MPLS label is a short identifier that identifies a forwarding equivalence class.
• E. A maximum of two labels can be imposed on an MPLS packet.

Correct answer: C, D

Explanation

Option C is correct because LDP indeed uses TCP to ensure reliable delivery of label mapping information. Option D is also correct as it accurately describes an MPLS label's function in identifying a forwarding equivalence class. Options A, B, and E are incorrect because they misrepresent MPLS label behavior and limitations.