350-501 MPLS and Segment Routing Practice Question
A network engineer is designing a Segment Routing over IPv6 (SRv6) deployment. Which TWO statements are true about the SRv6 SID format and behaviors? (Choose two.)
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.DT6 behavior is used for IPv6 L3VPN services.
SRv6 SID is 128 bits and consists of locator, function, and optional argument. End.DT6 is used for IPv6 L3VPN services. End.DT4 is for IPv4 L3VPN, not for L2VPN. End.X is not the default behavior; the default is End. The SRH is an extension header that does not replace the IPv6 header. Therefore, the correct answers are B and D.
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 behavior is a default behavior for any SID that is not explicitly defined.
Why it's wrong here
Incorrect. End.X is for cross-connect to a specific neighbor; default is End.
- ✓
End.DT6 behavior is used for IPv6 L3VPN services.
Why this is correct
Correct. End.DT6 decapsulates and forwards to IPv6 VPN.
- ✗
End.DT4 behavior is used for EVPN L2VPN services over SRv6.
Why it's wrong here
Incorrect. End.DT4 is for IPv4 L3VPN; End.DT2U is for L2VPN.
- ✓
The SRv6 SID is 128 bits long and consists of a Locator, Function, and optional Arguments.
Why this is correct
Correct. SRv6 SID is 128-bit IPv6 address with locator:function:argument.
- ✗
The SRH (Segment Routing Header) is an extension header that replaces the IPv6 header when SR is used.
Why it's wrong here
Incorrect. SRH is an extension header, not a replacement for the IPv6 header.
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