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350-401 Practice Question: Drag and drop the steps of IPsec IKEv2 tunnel…
Drag and drop the steps of IPsec IKEv2 tunnel establishment 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
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IKE_SA_INIT exchange (DH, nonces)
IKEv2 establishment starts with IKE_SA_INIT to negotiate cryptographic parameters and exchange Diffie-Hellman keys. Next, IKE_AUTH authenticates the peers and establishes the first CHILD_SA. Then, additional CHILD_SAs can be created via CREATE_CHILD_SA. Finally, the IPsec SA is used to encrypt data traffic.
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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