The answer is bandwidth reservation and priority. MPLS-TE allows network operators to explicitly reserve bandwidth along a path and assign priority levels to different traffic flows, ensuring that critical traffic gets through even during congestion. Unlike standard IGP routing, which always follows the shortest path based on metrics like cost or hop count, MPLS-TE uses explicit paths—either strict or loose—to steer traffic away from congested links, enabling load balancing and administrative policy enforcement. On the Cisco SPCOR 350-501 exam, this question tests your understanding that MPLS-TE is fundamentally about traffic engineering, not just label switching; a common trap is confusing MPLS-TE with basic MPLS forwarding, which lacks bandwidth awareness. Remember that MPLS-TE gives you control over *where* traffic goes and *how much* it can use, while IGP only controls the shortest route. A useful memory tip: think of MPLS-TE as a "reservation system with VIP lanes"—bandwidth is the reservation, priority is the VIP status.
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are characteristics of MPLS-TE (Traffic Engineering)?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Uses explicit paths to route traffic away from shortest-path IGP.
MPLS-TE uses explicit paths (either strict or loose) to direct traffic away from the shortest path determined by the IGP (e.g., OSPF or IS-IS). This allows network operators to engineer traffic flows based on administrative policies, such as load balancing or avoiding congested links, rather than relying solely on the IGP's metric-based shortest path.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Uses explicit paths to route traffic away from shortest-path IGP.
Why this is correct
MPLS-TE can specify explicit paths for traffic engineering.
Related concept
Read the scenario before looking for a memorised answer.
✗
Uses LDP for label distribution along the TE tunnel.
Why it's wrong here
MPLS-TE uses RSVP-TE for label distribution.
✓
Allows bandwidth reservation and priority.
Why this is correct
MPLS-TE supports bandwidth reservation and preemption.
Related concept
Read the scenario before looking for a memorised answer.
✗
Requires per-platform label space for TE tunnels.
Why it's wrong here
MPLS-TE uses per-interface label space for tunnels.
✗
Requires all routers in the TE tunnel to be in the same OSPF area.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between LDP and RSVP-TE, so the trap here is that candidates mistakenly associate MPLS-TE with LDP because both are label distribution protocols, but TE explicitly requires RSVP-TE for constraint-based path setup.
Detailed technical explanation
How to think about this question
Under the hood, MPLS-TE relies on RSVP-TE (RFC 3209) to signal the explicit path and reserve bandwidth. The TE tunnel head-end uses the Constrained Shortest Path First (CSPF) algorithm to compute a path that satisfies constraints (e.g., bandwidth, affinity) while avoiding IGP shortcuts. In real-world deployments, MPLS-TE is often used for fast reroute (FRR) protection or to optimize traffic flow across a multi-area network without requiring all routers to be in the same area.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Uses explicit paths to route traffic away from shortest-path IGP. — MPLS-TE uses explicit paths (either strict or loose) to direct traffic away from the shortest path determined by the IGP (e.g., OSPF or IS-IS). This allows network operators to engineer traffic flows based on administrative policies, such as load balancing or avoiding congested links, rather than relying solely on the IGP's metric-based shortest path.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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