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350-401 Practice Question: Drag and drop the steps of IKEv2 fragmentation…
Drag and drop the steps of IKEv2 fragmentation and DPD keepalive process into the correct order, from first to last.
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Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IKEv2 packet exceeds MTU on sender
IKEv2 fragmentation occurs when the IKE packet exceeds the MTU. The sender fragments the packet, marks it with a fragment number, and sends all fragments. The receiver reassembles them. DPD keepalives are sent periodically to verify the peer is still reachable; if no response is received, the peer is declared dead.
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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Variation 1. Drag and drop the steps of IKEv2 fragmentation and DPD keepalive process into the correct order, from first to last.
medium- ✓ A.Sender fragments IKE packet if over MTU
- ✓ B.Receiver reassembles fragmented IKE packet
- ✓ C.Peers send DPD keepalive messages
- ✓ D.Peer retransmits DPD if no response
- ✓ E.Peer declares SA dead and deletes it
Why A: During IKEv2, if the IKE packet exceeds the MTU, the sender fragments it into smaller pieces. The receiver reassembles the fragments into the original packet. After the IKE SA is established, the peers send Dead Peer Detection (DPD) keepalives to verify connectivity. If no response is received, the peer retransmits the DPD. After multiple failures, the peer declares the SA dead and deletes it.
JA
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.