350-501 MPLS and Segment Routing Practice Question
Which four statements correctly describe the SRv6 micro-SID (uSID) concept? (Choose four.)
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
✓
Micro-SID is incompatible with SR-MPLS.
SRv6 micro-SID uses a compressed SID format where multiple SIDs are encoded in a single 128-bit IPv6 address. It reduces overhead by combining SIDs into a carrier SID. The uSID instruction is usually 16 bits, and the locator block is shared. Micro-SID is incompatible with SR-MPLS because it operates in the IPv6 data plane, whereas SR-MPLS uses MPLS labels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Micro-SID is incompatible with SR-MPLS.
Why this is correct
Correct. Micro-SID is an SRv6 concept and is incompatible with SR-MPLS since it uses IPv6 forwarding.
- ✓
Micro-SID encodes multiple SIDs within a single 128-bit IPv6 address.
Why this is correct
Correct. Micro-SID encodes multiple SIDs within a single 128-bit IPv6 address by using a common locator and individual function bits.
- ✗
Micro-SID requires a dedicated SRH extension header.
Why it's wrong here
Incorrect. Micro-SID does not require a dedicated SRH extension header; instead, the SID is encoded in the destination address of the IPv6 header.
- ✓
Micro-SID uses a common locator block shared by all nodes in the domain.
Why this is correct
Correct. Micro-SID uses a common locator block that is shared across all nodes in the domain for routing.
- ✓
The micro-SID function is typically 16 bits long.
Why this is correct
Correct. The micro-SID function is typically 16 bits long, allowing for a large number of functions within the locator block.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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