mediumMultiple SelectObjective-mapped
300-410 Practice Question: Which THREE statements about IPsec transform sets…
Which THREE statements about IPsec transform sets are true? (Choose THREE.)
⚠ Common exam trap
Cisco often tests the misconception that AH provides encryption, when in fact AH only offers authentication and integrity, while encryption is exclusively the domain of ESP.
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
✓
A transform set can specify both ESP and AH protocols.
An IPsec transform set can specify both ESP and AH protocols simultaneously. This allows a single transform set to define the combined use of AH for authentication and ESP for encryption (or encryption plus authentication), providing flexibility in securing IPsec traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A transform set can specify both ESP and AH protocols.
Why this is correct
A transform set can include ESP (with or without encryption) and AH for authentication.
- ✗
A transform set must include an encryption algorithm.
Why it's wrong here
ESP can be used without encryption (ESP-null) for authentication only; AH does not provide encryption.
- ✓
Multiple transform sets can be configured and tried in order.
Why this is correct
You can configure multiple transform sets in a crypto map entry, and they are proposed in order during IKE negotiation.
- ✗
AH provides both authentication and encryption.
Why it's wrong here
AH provides authentication and integrity, but not encryption.
- ✓
The 'crypto ipsec transform-set' command is used to define the transform set.
Why this is correct
This command is used to create and name a transform set with specified algorithms.
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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