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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Chapter 2

1. Name the four fields that are part of a label.
A1: 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.
2. How many labels can reside in a label stack?
A2: Answer: Any number of labels can reside in a label stack.
3. In which layer does MPLS fit in the OSI reference model?
A3: Answer: MPLS fits in no category of the OSI reference model. The best description for MPLS would be Layer 2.5.
4. Which table does an LSR use to forward labeled packets?
A4: Answer: The LSR uses the LFIB table to forward labeled packets.
5. What type of interfaces in Cisco IOS use the Downstream-on-Demand label distribution mode and the per-interface label space? ...

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