350-501 Architecture Practice Question
Which THREE are requirements for deploying MPLS Traffic Engineering with RSVP-TE?
⚠ Common exam trap
Cisco often tests the misconception that LDP is required for MPLS TE with RSVP-TE, but RSVP-TE can distribute labels independently, making LDP optional.
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
✓
Links must have reservable bandwidth advertised
MPLS TE with RSVP-TE requires that links advertise reservable bandwidth so that the Constrained Shortest Path First (CSPF) algorithm can compute paths that satisfy bandwidth constraints. Without reservable bandwidth advertised via IGP extensions (e.g., OSPF TE or IS-IS TE), RSVP-TE cannot reserve resources along the path.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPFv3 must be the IGP
Why it's wrong here
RSVP-TE can work with IS-IS or OSPFv2; OSPFv3 not required.
- ✗
LDP must be enabled on all routers
Why it's wrong here
RSVP-TE does not require LDP; they can coexist but LDP is not mandatory.
- ✓
Links must have reservable bandwidth advertised
Why this is correct
Bandwidth reservations require links to advertise available bandwidth.
- ✓
CSPF (Constrained SPF) must be implemented for path calculation
Why this is correct
CSPF uses TE database to compute paths meeting constraints.
- ✓
RSVP-TE signaling protocol must be configured
Why this is correct
RSVP-TE is the signaling protocol for MPLS-TE.
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