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Following questions and answers are all new published by Cisco Official Exam Center: http://www.lead2pass.com/642-887.html
QUESTION 101
How many labels does an MPLS packet have, with a bottom-of-stack label set to zero?
A. The packet has no label.
B. The packet has one label.
C. The packet may have one or more labels.
D. The packet has at least two labels.