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Question 114 of 1,420
mediumDrag & DropObjective-mapped
350-401 Practice Question: Drag and drop the steps of service function…
Drag and drop the steps of service function chaining (SFC) path setup into the correct order, from first to last.
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
✓
Classifier identifies traffic and maps to service chain
SFC path setup begins with classifying traffic to determine which service chain to apply. Next, the classifier encapsulates packets with an NSH header. Then the SFC path is computed by the controller using the service function path identifier. After path computation, the controller installs forwarding entries in each service function forwarder. Finally, traffic traverses the chain as SFFs forward packets between VNFs.
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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of service function chaining (SFC) path setup into the correct order, from first to last.
medium- ✓ A.Classifier identifies traffic and adds NSH
- ✓ B.First SFF forwards packet to first SF
- ✓ C.SF processes packet and returns to SFF
- ✓ D.SFF forwards packet to next SFF in chain
- ✓ E.Last SFF removes NSH and forwards packet
Why A: SFC path setup starts with the classifier identifying traffic to be steered, then the classifier adds an NSH encapsulation to the packet. The first SFF receives the packet and forwards it to the first SF. After processing, the SF returns the packet to the SFF, which then forwards it to the next SFF in the chain. This repeats until the packet reaches the last SFF, which removes the NSH and forwards the packet.
Last reviewed: Jun 18, 2026
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