350-501 Services Practice Question
Which TWO of the following are characteristics of Segment Routing (SR-MPLS) compared to traditional LDP-based MPLS? (Select two.)
⚠ Common exam trap
Cisco often tests the misconception that SR-MPLS cannot do traffic engineering or fast reroute, when in fact it supports both through segment lists and TI-LFA, respectively.
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
✓
SR-MPLS does not require LDP or RSVP-TE for label distribution.
Segment Routing (SR-MPLS) eliminates the need for label distribution protocols like LDP or RSVP-TE. Instead, SR-MPLS encodes label information directly in the packet header as a segment list, and routers use the IGP (e.g., OSPF or IS-IS) to advertise segment identifiers (SIDs). This simplifies the control plane and removes protocol dependencies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
SR-MPLS requires a dedicated label range from 16 to 99.
Why it's wrong here
No such restriction.
- ✗
SR-MPLS does not support traffic engineering.
Why it's wrong here
SR-MPLS supports traffic engineering via SR-TE policies.
- ✓
SR-MPLS does not require LDP or RSVP-TE for label distribution.
Why this is correct
Labels are distributed via IGP extensions.
- ✗
SR-MPLS cannot provide fast reroute protection.
Why it's wrong here
SR-MPLS uses TI-LFA for fast reroute.
- ✓
SR-MPLS uses a segment list to encode the path in the packet header.
Why this is correct
Segment list defines the path.
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Senior Network & Security Engineer · founder of Courseiva
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