MPLS
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ExploreAbout this exam
The MPLS exam validates practical knowledge of Multiprotocol Label Switching as it is deployed in service provider and large enterprise networks. It suits network engineers, design and operations staff, and candidates moving from pure IP routing into label-switched transport, L3VPN and L2VPN services, traffic engineering, and modern Segment Routing evolution. Expect the exam to test why labels exist and how they are pushed, swapped, and popped; how LDP and RSVP-TE distribute and signal label bindings; how VRF tables, MP-BGP, and route targets build L3VPNs; how pseudowires and VPLS carry Layer 2; how TE tunnels and QoS classes shape traffic; how fast reroute and protection restore forwarding; how to verify and troubleshoot a label path with show and trace commands; and how Segment Routing changes the control plane. Preparation should combine a solid IP routing base (OSPF or IS-IS, BGP) with hands-on lab work on a router or virtual platform: build an LDP core, add a VRF and MP-BGP VPN, then a TE tunnel with FRR, and read the label stack at each hop. The official certification body publishes current exam logistics, including question count, duration, fees, and passing score, on its own site; candidates should confirm those details there before booking.
What you'll study
About MPLS preparation
What is the MPLS exam actually testing?
It tests whether you can explain and operate label-switched forwarding end to end: label distribution and signalling, stack operations and penultimate hop popping, L3VPN control and data planes, L2VPN pseudowires, traffic engineering and QoS, fast reroute, troubleshooting, and Segment Routing concepts. Expect scenario questions, not just definitions.
How many questions are on the exam, and how long do I get?
The official certification body publishes the current question count, time limit, and passing score on its own website. Those figures change between versions, so check the official page before you schedule rather than relying on forums or older study material.
How difficult is it compared with a general routing exam?
Most candidates find it harder than an intermediate routing exam because it layers label semantics over IP routing. If you already know OSPF or IS-IS and BGP, the new material is mainly label distribution, VPN route targets, and stack behaviour. Weak BGP skills are the most common reason people struggle.
What study order do you recommend?
Start with fundamentals and forwarding: labels, FEC, LIB/LFIB, PHP. Then LDP, followed by MP-BGP and L3VPN. Add L2VPN pseudowires, then RSVP-TE and QoS, then protection and troubleshooting. Finish with Segment Routing. Lab each topic before moving on; reading alone will not expose stack errors.
Can I pass with only reading and no lab?
It is possible but risky. Many questions describe a symptom and ask for the cause, such as a missing route target, a broken LSP, or an unexpected label stack. Building a small labelled core and VPN in a lab, then breaking it deliberately, teaches that diagnostic reasoning faster than text.
What are the most common failure modes?
Candidates lose marks by confusing the control plane (LDP, RSVP, BGP) with the forwarding plane; by mixing up route targets and route distinguishers; by forgetting that PHP removes the outer label before the egress; and by not knowing which command verifies which table. Practise mapping each symptom to a specific show command.
What happens if I fail, and can I retake it?
Retake rules, waiting periods, and any fees are set by the official certification body and published on its site. Check the current policy there before booking a second attempt, and use your score report to identify which domains to revisit rather than repeating the same preparation.
How much time should I plan for preparation?
There is no official figure. A practical plan for someone already comfortable with IP routing is several weeks of part-time study with lab sessions, weighted toward L3VPN and signalling because they carry the most exam weight. Candidates new to BGP should allow more time.
Does the exam cover Segment Routing?
Yes, at a smaller weight than classic MPLS topics. Focus on why SR removes per-LSP signalling state, how segment lists and node or adjacency SIDs steer a path, and how SR interworks with LDP and RSVP in an existing core. Deep SR policy detail is less likely than conceptual understanding.
Is this an official certification page?
No. This is independent study material and is not affiliated with or endorsed by any vendor or certification body. Always confirm exam format, registration, pricing, and policy details on the official body's website before making decisions.