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hardDrag & DropObjective-mapped
300-410 Practice Question: Drag and drop the troubleshooting steps for DMVPN…
Drag and drop the troubleshooting steps for DMVPN adjacency or connectivity failures into the correct order, from first to last.
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
✓
Verify physical and IP connectivity to hub
Troubleshooting DMVPN connectivity starts with verifying physical and IP reachability to the hub. Next, check NHRP registration status on the spoke. Then verify mGRE tunnel interface parameters and IPsec phase 1 (IKE) status. Finally, examine NHRP resolution between spokes to isolate the failure point.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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