The answer is SR-TE with an explicit path using a segment list, because this technique directly defines a strict, hop-by-hop path through the network by encoding each node or link as a segment in the MPLS label stack, ensuring traffic follows exactly the specified route regardless of IGP shortest-path calculations. On the Cisco SPCOR 350-501 exam, this concept tests your ability to distinguish between traffic-engineering tools: TI-LFA (option B) provides fast reroute protection, not path enforcement, while options involving color or service mapping rely on underlying IGP routing and cannot guarantee strict path adherence. A common trap is confusing SR-TE policies with simple BGP-based steering, but remember that an explicit segment list gives you granular control over every hop. Memory tip: “Explicit list = explicit path; no list = no strict enforcement.”
350-501 Architecture Practice Question
This 350-501 practice question tests your understanding of architecture. 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.
A large SP network uses Segment Routing (SR) with MPLS data plane. They want to enforce a strict path for certain traffic flows across the core while using shortest-path for others. Which technique should be used?
SR-TE with a segment list defines the exact path through the network.
B
Using TI-LFA
Why wrong: TI-LFA provides fast reroute, not strict path enforcement.
C
Configuring bandwidth reservation on all links
Why wrong: Bandwidth reservation is not a strict path mechanism and is not SR-specific.
D
Using SR policies with color extended community based on BGP
Why wrong: Color-based steering uses BGP to map traffic to SR policies, but the underlying path may still be shortest-path unless the policy explicitly defines a segment list.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SR-TE with explicit path using segment list
SR-TE with explicit path using segment lists allows defining a strict path. Option B (TI-LFA) is for fast reroute, not path enforcement. Option C is not SR-related. Option D uses color for service mapping but relies on underlying IGP routing; it doesn't enforce a strict path. Thus A is correct.
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.
✓
SR-TE with explicit path using segment list
Why this is correct
SR-TE with a segment list defines the exact path through the network.
Related concept
Static NAT maps one inside address to one outside address.
✗
Using TI-LFA
Why it's wrong here
TI-LFA provides fast reroute, not strict path enforcement.
✗
Configuring bandwidth reservation on all links
Why it's wrong here
Bandwidth reservation is not a strict path mechanism and is not SR-specific.
✗
Using SR policies with color extended community based on BGP
Why it's wrong here
Color-based steering uses BGP to map traffic to SR policies, but the underlying path may still be shortest-path unless the policy explicitly defines a segment list.
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.
Architecture — This question tests Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: SR-TE with explicit path using segment list — SR-TE with explicit path using segment lists allows defining a strict path. Option B (TI-LFA) is for fast reroute, not path enforcement. Option C is not SR-related. Option D uses color for service mapping but relies on underlying IGP routing; it doesn't enforce a strict path. Thus A is correct.
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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