The answer is PCEP with stateful delegation to the controller. This approach allows the SDN controller to dynamically compute, initiate, and update SR-TE tunnel paths in real time, ensuring fast convergence and scalability across the backbone. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of how stateful PCEP shifts path computation from individual routers to a centralized controller, enabling automated tunnel lifecycle management without manual intervention. A common trap is confusing PCEP stateful delegation with RSVP-TE or static configuration—remember that RSVP-TE is not segment-routing based, while static config lacks the dynamic adaptability required for large-scale deployments. For a memory tip, think of “stateful delegation” as giving the controller the keys to the car: it can steer tunnels instantly, while stateless PCEP only lets it suggest a route.
350-501 Automation and Assurance Practice Question
This 350-501 practice question tests your understanding of automation and assurance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 plans to deploy SR-TE tunnels across the backbone using an SDN controller for path computation. To ensure fast convergence and scalability, which automation approach should be used for tunnel creation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
PCEP with stateful delegation to controller
PCEP with stateful delegation allows the controller to compute and update paths dynamically, providing fast convergence and scalability. Static configuration lacks automation, RSVP-TE is not SR-based, NetFlow is for monitoring, and SNMP traps are for alerts, not tunnel creation.
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.
✗
Static configuration on each router
Why it's wrong here
Static configuration is manual and lacks dynamic adaptation, leading to slower convergence.
✓
PCEP with stateful delegation to controller
Why this is correct
Stateful PCEP enables the controller to optimize and update SR-TE paths in real time, improving convergence.
Related concept
Static NAT maps one inside address to one outside address.
✗
RSVP-TE tunnels
Why it's wrong here
RSVP-TE is not based on Segment Routing and is less scalable for large networks.
✗
NetFlow-based path selection
Why it's wrong here
NetFlow is for traffic analysis, not for tunnel creation or path computation.
✗
SNMP traps
Why it's wrong here
SNMP traps are for event notifications, not for configuring tunnels.
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.
Automation and Assurance — This question tests Automation and Assurance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: PCEP with stateful delegation to controller — PCEP with stateful delegation allows the controller to compute and update paths dynamically, providing fast convergence and scalability. Static configuration lacks automation, RSVP-TE is not SR-based, NetFlow is for monitoring, and SNMP traps are for alerts, not tunnel creation.
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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