- A
R1 has a route-map that sets local preference to 200 for prefixes received from R2, causing R3 to prefer the path through R1 over the direct path.
Correct. BGP local preference is propagated to iBGP peers. If R1 sets a high local preference on routes from R2, R3 will prefer the path via R1, even if a direct spoke-to-spoke tunnel is available.
- B
R3 has a static route pointing to R1 for 192.168.1.0/24, overriding BGP.
Why wrong: Incorrect. Static routes have higher administrative distance than BGP, but the issue is about BGP path selection, not static routes.
- C
NHRP redirect is disabled on R1, preventing spoke-to-spoke tunnel establishment.
Why wrong: Incorrect. NHRP redirect is needed for Phase 3, but the issue is BGP path selection, not tunnel establishment.
- D
R2 is advertising the prefix with a MED of 0, causing R3 to prefer the path through R1.
Why wrong: Incorrect. MED is compared only when paths are from the same AS, and local preference is evaluated before MED. The issue is local preference manipulation.
Quick Answer
The answer is that R1 has a route-map setting local preference to 200 for prefixes received from R2, which overrides the normal BGP path selection. This is because BGP local preference is a well-known mandatory attribute that is propagated throughout the autonomous system, and when the hub (R1) manipulates it via a route-map, the higher value (200) is advertised to other spokes like R3. In a DMVPN Phase 3 network, spoke-to-spoke tunnels are established dynamically, but BGP’s best-path algorithm will always prefer the path with the highest local preference, forcing R3 to route through the hub instead of using the direct spoke-to-spoke path. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how BGP path attributes interact with DMVPN overlay routing, and a common trap is forgetting that local preference is transitive within the AS—it affects all iBGP peers, not just the immediate neighbor. Memory tip: “Local pref is king in the AS—if it’s higher, the hub becomes the middleman.”
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 DMVPN Phase 3 network uses BGP for routing between hubs and spokes. R1 (hub) and R2 (spoke) have an eBGP peering. R2 advertises a prefix 192.168.1.0/24 to R1. R3 (another spoke) receives this prefix via R1 but with a higher local preference than expected, causing R3 to prefer the path through R1 even though a direct spoke-to-spoke tunnel exists. What is the root cause?
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
R1 has a route-map that sets local preference to 200 for prefixes received from R2, causing R3 to prefer the path through R1 over the direct path.
BGP local preference is manipulated on the hub (R1) using route-maps or policy, causing the prefix to have a higher local preference when advertised to other spokes. This overrides the normal BGP path selection and forces traffic through the hub, even if a direct spoke-to-spoke tunnel is available.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 has a route-map that sets local preference to 200 for prefixes received from R2, causing R3 to prefer the path through R1 over the direct path.
- ✗
R3 has a static route pointing to R1 for 192.168.1.0/24, overriding BGP.
Why it's wrong here
Incorrect. Static routes have higher administrative distance than BGP, but the issue is about BGP path selection, not static routes.
- ✗
NHRP redirect is disabled on R1, preventing spoke-to-spoke tunnel establishment.
Why it's wrong here
Incorrect. NHRP redirect is needed for Phase 3, but the issue is BGP path selection, not tunnel establishment.
- ✗
R2 is advertising the prefix with a MED of 0, causing R3 to prefer the path through R1.
Why it's wrong here
Incorrect. MED is compared only when paths are from the same AS, and local preference is evaluated before MED. The issue is local preference manipulation.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
- →
DMVPN — study guide chapter
Learn the concepts, then practise the questions
- →
DMVPN practice questions
Targeted practice on this topic area only
- →
All 300-410 questions
2,152 questions across all exam domains
- →
Cisco CCNP ENARSI 300-410 study guide
Full concept coverage aligned to exam objectives
- →
300-410 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 300-410 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Layer 3 Technologies practice questions
Practise 300-410 questions linked to Layer 3 Technologies.
EIGRP Troubleshooting practice questions
Practise 300-410 questions linked to EIGRP Troubleshooting.
OSPF Troubleshooting (v2/v3) practice questions
Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).
BGP Troubleshooting practice questions
Practise 300-410 questions linked to BGP Troubleshooting.
Route Redistribution practice questions
Practise 300-410 questions linked to Route Redistribution.
Policy-Based Routing (PBR) practice questions
Practise 300-410 questions linked to Policy-Based Routing (PBR).
VRF-Lite practice questions
Practise 300-410 questions linked to VRF-Lite.
Route Maps and Route Filtering practice questions
Practise 300-410 questions linked to Route Maps and Route Filtering.
Administrative Distance practice questions
Practise 300-410 questions linked to Administrative Distance.
Route Summarization practice questions
Practise 300-410 questions linked to Route Summarization.
Bidirectional Forwarding Detection (BFD) practice questions
Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).
VPN Technologies practice questions
Practise 300-410 questions linked to VPN Technologies.
Practice this exam
Start a free 300-410 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 300-410 question test?
DMVPN — This question tests DMVPN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: R1 has a route-map that sets local preference to 200 for prefixes received from R2, causing R3 to prefer the path through R1 over the direct path. — BGP local preference is manipulated on the hub (R1) using route-maps or policy, causing the prefix to have a higher local preference when advertised to other spokes. This overrides the normal BGP path selection and forces traffic through the hub, even if a direct spoke-to-spoke tunnel is available.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 18, 2026
This 300-410 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 300-410 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.