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mediumDrag & DropObjective-mapped
CAS-004 Practice Question: Drag and drop the steps to configure a…
Drag and drop the steps to configure a site-to-site IPsec VPN on a firewall into the correct order.
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
✓
Configure IKE policy, then configure IPsec policy, then create VPN tunnel, then define interesting traffic, then apply crypto map to the outgoing interface.
IPsec VPN configuration follows a logical order: first define IKE policy, then IPsec policy, create tunnel, permit traffic, and finally apply crypto map.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure IKE policy, then configure IPsec policy, then create VPN tunnel, then define interesting traffic, then apply crypto map to the outgoing interface.
Why this is correct
This is the correct order because IKE (Phase 1) must be configured first to establish a secure channel, followed by IPsec (Phase 2) for data encryption, then the tunnel is created, traffic is defined, and the crypto map is applied to activate the VPN on the interface.
- ✗
Configure IPsec policy, then configure IKE policy, then create VPN tunnel, then define interesting traffic, then apply crypto map.
Why it's wrong here
This is incorrect because IPsec policy depends on IKE parameters; configuring IPsec before IKE can lead to missing references or authentication failures.
- ✗
Create VPN tunnel, then define interesting traffic, then configure IKE policy, then configure IPsec policy, then apply crypto map.
Why it's wrong here
This is incorrect because the tunnel cannot be properly created without first defining the IKE and IPsec policies, and traffic must be defined before applying the crypto map.
- ✗
Define interesting traffic, then configure IKE policy, then configure IPsec policy, then create VPN tunnel, then apply crypto map.
Why it's wrong here
This is incorrect because defining traffic early is possible but the typical order requires IKE and IPsec policies before tunnel creation; however, the main error is that the crypto map should be applied after the tunnel is created.
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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