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Which label operation is performed by an MPLS transit router?

Which label operation is performed by an MPLS transit router?
A . inject
B . pop
C . push
D . swap

Answer: D

Explanation:

http://www.juniper.net/techpubs/software/junos-security/junos-security96/junos­security-swconfig-interfaces-and-routing/mpls-ov.html

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