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350-501 Services Practice Question
This 350-501 practice question tests your understanding of services. 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 THREE of the following L3VPN services require the use of a dedicated control plane per VPN instance?
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
✓
6VPE
6VPE (IPv6 VPN Provider Edge) requires a dedicated control plane per VPN instance because it uses separate per-VPN routing tables and a distinct BGP session (typically MP-BGP with the IPv6 address family) to exchange IPv6 VPN routes. This ensures that each customer's IPv6 routing information is isolated and processed independently, which is a core requirement for L3VPN services that maintain per-VPN forwarding and control plane separation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all MPLS-based VPN services (including VPLS and MDT VPN) require per-VPN control planes, but only L3VPN services that maintain per-VPN routing tables and separate routing protocol instances (like MPLS L3VPN, 6VPE, and CSC VPN) actually need dedicated control planes per VPN instance.
Detailed technical explanation
How to think about this question
In MPLS L3VPN and Carrier Supporting Carrier (CSC) VPN, each VPN instance maintains its own VRF (Virtual Routing and Forwarding) table, which includes a separate routing protocol process (e.g., OSPF, EIGRP, or BGP) and a distinct RIB/FIB, ensuring complete control plane isolation. For 6VPE, this isolation extends to IPv6 address families, where the PE router runs separate MP-BGP sessions per VPN to exchange IPv6 VPN-IPv6 routes (RFC 4659), and each VRF contains its own IPv6 routing table. CSC VPNs further require per-VPN control planes because the carrier's carrier scenario involves separate IGP and BGP sessions between the customer carrier and the provider carrier for each VPN, preventing route leakage between different customer networks.
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 practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this 350-501 question test?
Services — This question tests Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 6VPE — 6VPE (IPv6 VPN Provider Edge) requires a dedicated control plane per VPN instance because it uses separate per-VPN routing tables and a distinct BGP session (typically MP-BGP with the IPv6 address family) to exchange IPv6 VPN routes. This ensures that each customer's IPv6 routing information is isolated and processed independently, which is a core requirement for L3VPN services that maintain per-VPN forwarding and control plane separation.
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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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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