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350-401 Practice Question: Which three statements about MPLS traffic…
Which three statements about MPLS traffic engineering (MPLS-TE) are true? (Choose three.)
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
✓
MPLS-TE uses RSVP-TE to signal LSPs and reserve resources.
MPLS-TE uses RSVP-TE to signal explicit paths and reserve bandwidth. It can use OSPF or IS-IS extended LSAs to advertise link attributes like bandwidth and delay. MPLS-TE allows traffic to be routed away from shortest-path IGP routes. LDP is not involved in TE; RSVP-TE handles label assignment for TE tunnels. MPLS-TE does not use BGP for path computation; it uses CSPF (Constrained Shortest Path First).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
MPLS-TE uses RSVP-TE to signal LSPs and reserve resources.
Why this is correct
Correct because RSVP-TE is the signaling protocol for MPLS-TE, enabling bandwidth reservation and explicit paths.
- ✓
OSPF or IS-IS can be extended to carry TE link attributes.
Why this is correct
Correct because OSPF TE extensions (opaque LSAs) and IS-IS TE extensions advertise link bandwidth, delay, etc.
- ✓
MPLS-TE allows traffic to follow paths that differ from the IGP shortest path.
Why this is correct
Correct because MPLS-TE can steer traffic onto explicit paths that are not the IGP shortest path.
- ✗
MPLS-TE relies on LDP to distribute labels for TE tunnels.
Why it's wrong here
Incorrect because MPLS-TE uses RSVP-TE to assign labels; LDP is not used for TE tunnels.
- ✗
MPLS-TE uses BGP to compute the best path for TE LSPs.
Why it's wrong here
Incorrect because MPLS-TE uses CSPF (Constrained SPF) based on IGP TE database, not BGP.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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