The answer is `show segment-routing traffic-eng policy` and `show mpls forwarding-table labels`. These two commands are most effective because the first verifies that the SR-TE policy is active by displaying its operational state, candidate paths, and segment lists, while the second confirms that the corresponding label has been installed in the forwarding plane, proving traffic is actually being forwarded. On the Cisco SPCOR 350-501 exam, this pairing tests your ability to distinguish between control-plane policy status and data-plane forwarding verification, a common trap being that `show segment-routing traffic-eng policy` alone does not guarantee label installation. Remember the memory tip: “Policy for status, labels for traffic”—if you see the policy is up but the label is missing from the forwarding table, the traffic is not being forwarded despite the policy being active.
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 commands are most effective to verify that an SR-TE policy is active and forwarding traffic? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show segment-routing traffic-eng policy
To verify SR-TE policy, `show segment-routing traffic-eng policy` (C) shows policy status, candidate paths, and segment lists. `show mpls forwarding-table labels` (E) shows the forwarding entry for the SR-TE label, confirming installation. Option A shows BGP-LU labels, not SR-TE. Option B shows IGP segments, not SR-TE policy forwarding. Option D shows segment list details but not active forwarding state.
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.
✓
show segment-routing traffic-eng policy
Why this is correct
Shows the SR-TE policies, their state (active/inactive), and candidate paths.
Related concept
Static NAT maps one inside address to one outside address.
✗
show isis database verbose
Why it's wrong here
Shows IGP segment routing information, not SR-TE policy status.
✓
show mpls forwarding-table labels
Why this is correct
Displays MPLS forwarding entries; the presence of the SR-TE label indicates the policy is installed and forwarding.
Related concept
Static NAT maps one inside address to one outside address.
✗
show segment-routing traffic-eng segment-list
Why it's wrong here
Shows the configured segment lists but not whether the policy is active and forwarding.
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
Shows IGP segment routing information, not SR-TE policy status.
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: show segment-routing traffic-eng policy — To verify SR-TE policy, `show segment-routing traffic-eng policy` (C) shows policy status, candidate paths, and segment lists. `show mpls forwarding-table labels` (E) shows the forwarding entry for the SR-TE label, confirming installation. Option A shows BGP-LU labels, not SR-TE. Option B shows IGP segments, not SR-TE policy forwarding. Option D shows segment list details but not active forwarding state.
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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