350-501 MPLS and Segment Routing Practice Question
In SRv6, which Segment Identifier (SID) format is used to encode a function that performs IPv6 decapsulation and forwarding?
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
✓
End.DT4
SRv6 SIDs are 128-bit and structured as Locator:Function:Arguments. End.DT4 is a function that decapsulates the outer IPv6 header and forwards the inner IPv4 packet based on destination.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
End.X
Why it's wrong here
End.X performs cross-connect to a specific link.
- ✗
End.B6
Why it's wrong here
End.B6 is for encapsulation in another SRv6 policy.
- ✓
End.DT4
Why this is correct
Correct.
- ✗
End
Why it's wrong here
End performs endpoint function without decap.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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