Question 397 of 2,015

WAN Technologies →mediumDrag & DropObjective-mapped

Quick Answer

The correct answer is that the spoke forwards traffic through the hub as the final step. This sequence is dictated by the DMVPN Phase 1 architecture, where the spoke initiates an mGRE tunnel to the hub using a multipoint interface, the hub registers the spoke’s NHRP mapping, and then the spoke dynamically learns routes from the hub via the tunnel before it can forward any traffic. On the ENCOR 350-401 exam, this drag-and-drop task tests your understanding of the control-plane versus data-plane flow in a hub-and-spoke topology; a common trap is placing route learning after traffic forwarding, which would be impossible without a routing table. Remember the mnemonic “Tunnel, Register, Learn, Forward” to lock in the order: the spoke first establishes the tunnel, the hub registers the NHRP mapping, the spoke learns routes, and only then does it forward traffic through the hub.

350-401 WAN Technologies Practice Question

This 350-401 practice question tests your understanding of wan 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 1 spoke-to-hub tunnel setup 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.

Question 1mediumdrag order

Read the full VPN explanation →

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

✓

Spoke configures mGRE tunnel interface to hub

In DMVPN Phase 1, the spoke first establishes an mGRE tunnel to the hub using a multipoint interface. The hub then registers the spoke's NHRP mapping. After registration, the spoke can dynamically learn routes from the hub via the tunnel. Finally, the spoke sends traffic through the hub, which routes it to the destination.

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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FAQ

Questions learners often ask

What does this 350-401 question test?

WAN Technologies — This question tests WAN Technologies — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Spoke configures mGRE tunnel interface to hub — In DMVPN Phase 1, the spoke first establishes an mGRE tunnel to the hub using a multipoint interface. The hub then registers the spoke's NHRP mapping. After registration, the spoke can dynamically learn routes from the hub via the tunnel. Finally, the spoke sends traffic through the hub, which routes it to the destination.

What should I do if I get this 350-401 question wrong?

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 1 spoke-to-hub tunnel setup into the correct order, from first to last.

medium

✓ A.Configure mGRE tunnel interface on spoke
✓ B.Configure NHRP with hub as NHS
✓ C.Spoke registers its NBMA address via NHRP
✓ D.Hub adds spoke to its NHRP database
✓ E.Spoke sends traffic through hub

Why A: In DMVPN Phase 1, the spoke first establishes an mGRE tunnel to the hub using NHRP registration, then the hub learns the spoke's NBMA address, and finally the spoke can route traffic through the hub. The correct order is: configure mGRE tunnel interface on spoke, configure NHRP with hub as NHS, spoke registers its NBMA address via NHRP, hub adds spoke to its NHRP database, and spoke sends traffic through hub.

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