Quick Answer
The answer is MPLS TE Fast Reroute (FRR), which is the correct feature for providing bandwidth protection for voice traffic. FRR achieves sub-50 ms failover by pre-computing and pre-signaling a backup tunnel that bypasses a protected link or node, ensuring that delay-sensitive voice traffic experiences minimal packet loss during a failure. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this concept tests your understanding of how FRR differs from standard TE tunnel convergence, which can take seconds. A common trap is confusing FRR with MPLS TE path protection or simple link protection; remember that FRR is the only option that guarantees sub-50 ms restoration without waiting for head-end signaling. For a memory tip, think “FRR = Fast Re-Route = Fifty ms Recovery” to recall its primary advantage for voice traffic.
This 350-501 practice question tests your understanding of networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A network administrator is designing an MPLS TE tunnel for a service provider backbone. The goal is to provide bandwidth protection for voice traffic. Which MPLS TE feature should be configured?
Autoroute announce
Why wrong: Autoroute announces the tunnel as a directly connected interface to IGP.
Path-option
Why wrong: Path-option defines the path for the tunnel.
Fast Reroute (FRR)
FRR provides backup LSPs to protect against link or node failures.
Bandwidth protection
Why wrong: Bandwidth protection is not a specific MPLS TE feature.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Fast Reroute (FRR)
MPLS TE Fast Reroute (FRR) provides sub-50 ms protection against link or node failures by pre-computing and pre-signaling a backup tunnel that bypasses the protected element. This meets the requirement for bandwidth protection of voice traffic, which is sensitive to packet loss and delay during network convergence.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Autoroute announce
Why it's wrong here
Autoroute announces the tunnel as a directly connected interface to IGP.
Path-option
Why it's wrong here
Path-option defines the path for the tunnel.
Fast Reroute (FRR)
Why this is correct
FRR provides backup LSPs to protect against link or node failures.
Related concept
Read the scenario before looking for a memorised answer.
Bandwidth protection
Why it's wrong here
Bandwidth protection is not a specific MPLS TE feature.
Common exam traps
Cisco often tests the distinction between features that provide path selection (Path-option) or traffic steering (Autoroute announce) versus features that provide actual failure protection (FRR), leading candidates to confuse 'bandwidth protection' as a separate feature rather than a benefit of FRR.
Detailed technical explanation
MPLS TE FRR uses the Resource Reservation Protocol (RSVP) to pre-signal a backup tunnel (bypass or detour) that is activated immediately upon detection of a link or node failure via the local repair point. The backup tunnel is established with a different path to avoid the protected resource, and the Point of Local Repair (PLR) performs label switching to the backup tunnel without waiting for IGP convergence or head-end signaling. In real-world deployments, FRR is often combined with one-to-one backup (detour) or facility backup (bypass) modes, where facility backup is more scalable for large networks.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: Fast Reroute (FRR) — MPLS TE Fast Reroute (FRR) provides sub-50 ms protection against link or node failures by pre-computing and pre-signaling a backup tunnel that bypasses the protected element. This meets the requirement for bandwidth protection of voice traffic, which is sensitive to packet loss and delay during network convergence.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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