Question 1mediumdrag order
Read the full VPN explanation →Question 811 of 2,015
Quick Answer
The answer is that the final step in DMVPN Phase 2 NHRP resolution is Spoke1 and Spoke2 establishing a direct mGRE tunnel. This is correct because Phase 2 allows spokes to learn each other’s real public IP addresses via the hub, enabling dynamic spoke-to-spoke tunnels without routing all traffic through the hub. The process begins when Spoke1 sends an NHRP Resolution Request to the hub, which proxies the request to the destination spoke; that spoke replies with its public address, the hub forwards the reply, and only then do the two spokes build a direct tunnel. On the ENCOR 350-401 exam, this drag-and-drop task tests your ability to sequence the NHRP resolution flow, and a common trap is placing the direct tunnel establishment before the reply is received. Remember the key distinction: Phase 2 supports spoke-to-spoke shortcuts, while Phase 1 forces all traffic through the hub. A helpful mnemonic is “Request, Forward, Reply, Forward, Tunnel” — think of the hub as a relay, not a router.
CCNP VPN Technologies Practice Question
This 350-401 practice question tests your understanding of vpn technologies. 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.
Drag and drop the steps of DMVPN Phase 2 NHRP resolution process into the correct order, from first to last.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Spoke1 sends NHRP Resolution Request to hub
In DMVPN Phase 2, the spoke sends an NHRP Resolution Request to the hub to learn the public address of the destination spoke. The hub forwards this request to the destination spoke, which replies with an NHRP Resolution Reply containing its public address. The hub forwards the reply back to the requesting spoke, and then the two spokes establish a direct tunnel.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 350-401 NAT questions on configuration and troubleshooting.
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VPN Technologies — study guide chapter
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FAQ
Questions learners often ask
What does this 350-401 question test?
VPN Technologies — This question tests VPN Technologies — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Spoke1 sends NHRP Resolution Request to hub — In DMVPN Phase 2, the spoke sends an NHRP Resolution Request to the hub to learn the public address of the destination spoke. The hub forwards this request to the destination spoke, which replies with an NHRP Resolution Reply containing its public address. The hub forwards the reply back to the requesting spoke, and then the two spokes establish a direct tunnel.
What should I do if I get this 350-401 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 350-401 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Same concept, more angles
1 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of DMVPN Phase 2 NHRP resolution process into the correct order, from first to last.
medium- ✓ A.Spoke sends NHRP Resolution Request to hub
- ✓ B.Hub forwards request to destination spoke
- ✓ C.Destination spoke sends NHRP Resolution Reply
- ✓ D.Hub relays reply to originating spoke
- ✓ E.Originating spoke installs NHRP shortcut entry
Why A: In DMVPN Phase 2, the spoke sends an NHRP Resolution Request to the hub to learn the destination spoke's NBMA address. The hub forwards the request to the destination spoke, which replies with an NHRP Resolution Reply. The hub relays this reply back to the originating spoke. Finally, the originating spoke installs the NHRP shortcut entry and can initiate a direct tunnel to the destination spoke.
Last reviewed: Jun 18, 2026
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