easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show crypto isakmp policy
Global IKE policy Protection suite of priority 10 encryption algorithm: AES - Advanced Encryption Standard (256 bit keys). hash algorithm: Secure Hash Standard 2 (SHA256) authentication method: Pre-Shared Key Diffie-Hellman group: #14 (2048 bit) lifetime: 86400 seconds, no volume limit
Protection suite of priority 20 encryption algorithm: AES - Advanced Encryption Standard (128 bit keys). hash algorithm: Secure Hash Standard 2 (SHA256) authentication method: Pre-Shared Key Diffie-Hellman group: #14 (2048 bit) lifetime: 86400 seconds, no volume limit
Based on this output, which statement is correct?
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
✓
The router has two IKE policies configured; policy 10 will be preferred.
The output shows the configured IKE policies. Both use pre-shared key authentication. This is a normal configuration for IPsec VPN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The router has two IKE policies configured; policy 10 will be preferred.
Why this is correct
Lower priority number is preferred; policy 10 with AES-256 will be tried first.
- ✗
The router has no IKE policies configured; the output is empty.
Why it's wrong here
Two policies are clearly shown.
- ✗
The router uses certificate-based authentication.
Why it's wrong here
The authentication method is Pre-Shared Key.
- ✗
The Diffie-Hellman group is group 2 (1024 bit).
Why it's wrong here
Group 14 is 2048 bit.
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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