- A
Label imposition occurs at the ingress LSR.
The ingress LSR pushes a label onto an incoming IP packet to begin MPLS forwarding.
- B
Label imposition occurs at the egress LSR.
Why wrong: The egress LSR pops the label, not imposes it.
- C
The imposed label is determined by the Forwarding Equivalence Class (FEC).
The FEC maps the IP prefix to a label, which is then pushed onto the packet.
- D
The imposed label is always the top label in a label stack.
Why wrong: While the imposed label becomes the top label, this statement is not always true in all contexts (e.g., when pushing multiple labels). However, in basic MPLS, it is the top label, but the key point is that it is determined by FEC.
- E
Label imposition is performed using the 'tag-switching' command.
Why wrong: There is no such command; label imposition is automatic based on MPLS configuration and routing.
300-410 MPLS Operations Practice Question
This 300-410 practice question tests your understanding of mpls operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements about MPLS label imposition (push) are true? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Label imposition occurs at the ingress LSR.
Label imposition occurs at the ingress LSR, which pushes a label onto an unlabeled IP packet. The label is based on the FEC (Forwarding Equivalence Class) derived from the IP destination. The egress LSR pops the label, not imposes it.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Label imposition occurs at the ingress LSR.
Why this is correct
The ingress LSR pushes a label onto an incoming IP packet to begin MPLS forwarding.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Label imposition occurs at the egress LSR.
Why it's wrong here
The egress LSR pops the label, not imposes it.
- ✓
The imposed label is determined by the Forwarding Equivalence Class (FEC).
Why this is correct
The FEC maps the IP prefix to a label, which is then pushed onto the packet.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The imposed label is always the top label in a label stack.
Why it's wrong here
While the imposed label becomes the top label, this statement is not always true in all contexts (e.g., when pushing multiple labels). However, in basic MPLS, it is the top label, but the key point is that it is determined by FEC.
- ✗
Label imposition is performed using the 'tag-switching' command.
Why it's wrong here
There is no such command; label imposition is automatic based on MPLS configuration and routing.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
There is no such command; label imposition is automatic based on MPLS configuration and routing.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 300-410 question test?
MPLS Operations — This question tests MPLS Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Label imposition occurs at the ingress LSR. — Label imposition occurs at the ingress LSR, which pushes a label onto an unlabeled IP packet. The label is based on the FEC (Forwarding Equivalence Class) derived from the IP destination. The egress LSR pops the label, not imposes it.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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