CCNP SP MPLS FAQ: MPLS Architecture Q1. Name the four fields that are part of a label. Answer: The four fields that are part of a label are a 20-bit label value, 3 experimental bits, 1 Bottom of Stack bit, and an 8-bit TTL field. Q2. How many labels can reside in a label stack? Answer: Any number of labels can reside in a label stack. Q3. In which layer does MPLS fit in … [Read more...]