Drag and drop each IPsec mode on the left to its matching header usage on the right.
Drag a concept onto its matching description — or click a concept then click the description.
New IP header + ESP header + original IP packet + ESP trailer
Original IP header + ESP header + payload + ESP trailer
New IP header + AH header + original IP packet
Original IP header + AH header + payload
UDP encapsulation of ESP packet
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ESP tunnel mode: New IP header + ESP header + original IP packet + ESP trailer
Tunnel mode encrypts original IP header and adds new IP header; transport mode encrypts only payload; ESP tunnel adds ESP header between new and original IP; AH transport authenticates payload and original header; AH tunnel authenticates entire new packet.
Quick reference
| 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
This 350-401 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 350-401 exam.