JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 58

Which label operation is performed by an MPLS transit router?

Answer options

• A. inject
• B. pop
• C. push
• D. swap

Correct answer: D

Explanation

An MPLS transit router performs the swap operation, replacing the incoming label with a new one for the outgoing path. The other options, such as pop and push, refer to removing or adding labels, which are not the primary function of a transit router in the MPLS architecture.