350-701 Network Security Practice Question
A Cisco ASA is configured with a site-to-site VPN using IKEv2. Which component defines the encryption and authentication algorithms for the IPsec tunnel?
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
✓
Transform set
A transform set specifies the encryption (e.g., AES) and authentication (e.g., SHA) algorithms for IPsec. ISAKMP policy is for IKE phase 1, and crypto map binds the policy to an interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transform set
Why this is correct
Transform set defines IPsec encryption and authentication.
- ✗
ISAKMP policy
Why it's wrong here
ISAKMP policy defines phase 1 parameters, not IPsec algorithms.
- ✗
IKEv2 proposal
Why it's wrong here
IKEv2 proposal is used in Firepower, not ASA; but still defines IKE parameters, not IPsec.
- ✗
Crypto map
Why it's wrong here
Crypto map binds the transform set and other parameters to an interface.
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
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