350-501 Networking Practice Question
In OSPFv3 (for IPv6), which of the following statements is true regarding OSPFv3 packet format and authentication?
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
✓
OSPFv3 relies on IPsec for authentication and encryption.
OSPFv3 uses IPsec for authentication and does not include authentication fields in the OSPF header. It runs per-link instead of per-subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPFv3 relies on IPsec for authentication and encryption.
Why this is correct
OSPFv3 uses IPsec AH or ESP for authentication and confidentiality.
- ✗
OSPFv3 does not support authentication.
Why it's wrong here
OSPFv3 supports authentication via IPsec.
- ✗
OSPFv3 authenticates using the Authentication field in the OSPF header.
Why it's wrong here
OSPFv3 header has no authentication fields.
- ✗
OSPFv3 uses the same authentication mechanisms as OSPFv2.
Why it's wrong here
OSPFv2 uses simple password or MD5; OSPFv3 uses IPsec.
Visual reference
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.