300-410 MPLS Practice Questions
The free 300-410: Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) questions that deal with MPLS, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #4
Which technique removes the outermost label of an MPLS-tagged packet before the packet is forwarded to an adjacent LER?
Correct answer: D
Explanation
Penultimate hop popping has the second-to-last LSR remove the outermost label before forwarding to the egress LER, saving that router a lookup. Explicit-null keeps a label with value 0 instead of popping it.
Question #9
What is an MPLS LDP targeted session?
Correct answer: C
Explanation
A targeted LDP session is a label distribution session built with unicast targeted hellos to a neighbor that is not directly connected, such as for AToM or session protection. Ordinary link sessions use multicast hellos between directly connected LSRs.
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