350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. 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 are characteristics of Segment Routing (SR-MPLS)? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It relies on source routing
Segment Routing uses source routing where the source specifies the path as a list of segments. It does not require LDP or RSVP-TE. It can use both MPLS and IPv6 data planes. Option C is wrong because SR does not require a centralized controller by default (though it can be used with one). Option D is wrong because SR allows intermediate nodes to forward based on the top segment, not IP address.
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.
✓
It relies on source routing
Why this is correct
SR performs source routing by encoding the path as a segment list.
Related concept
Static NAT maps one inside address to one outside address.
✗
It requires a centralized controller for traffic engineering
Why it's wrong here
SR can perform traffic engineering without a controller using explicit segment lists.
✗
It forwards packets based on destination IP address at each hop
Why it's wrong here
SR forwards based on the top segment (label), not IP address.
✗
It requires MPLS LDP for label distribution
Why it's wrong here
SR uses IGP extensions to distribute prefix-SIDs and adjacency-SIDs; LDP is not needed.
✓
It supports both MPLS and IPv6 data planes
Why this is correct
SR can be applied to MPLS (SR-MPLS) or IPv6 (SRv6) data planes.
Related concept
Static NAT maps one inside address to one outside address.
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.
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 350-501 NAT questions on configuration and troubleshooting.
MPLS and Segment Routing — This question tests MPLS and Segment Routing — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: It relies on source routing — Segment Routing uses source routing where the source specifies the path as a list of segments. It does not require LDP or RSVP-TE. It can use both MPLS and IPv6 data planes. Option C is wrong because SR does not require a centralized controller by default (though it can be used with one). Option D is wrong because SR allows intermediate nodes to forward based on the top segment, not IP address.
What should I do if I get this 350-501 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 350-501 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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Question Discussion
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