mediumMultiple 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 sa detail
Codes: C - IKEv1, I - IKEv2
C-id Local Remote I-VRF Status Encr Hash Auth DH Lifetime Cap 1 10.1.1.1 10.1.1.2 ACTIVE aes sha psk 14 23:59:59
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 IKEv1 SA is established with the peer 10.1.1.2.
The ISAKMP SA is active, using AES encryption, SHA hash, pre-shared key authentication, and Diffie-Hellman group 14. The lifetime is about 24 hours.
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 IKEv1 SA is established with the peer 10.1.1.2.
Why this is correct
The 'C' code indicates IKEv1, and the status is ACTIVE.
- ✗
The IKEv2 SA is established with the peer 10.1.1.2.
Why it's wrong here
The code 'C' indicates IKEv1, not IKEv2.
- ✗
The ISAKMP SA is not established; status is MM_NO_STATE.
Why it's wrong here
Status is ACTIVE, meaning it is established.
- ✗
The Diffie-Hellman group is group 2.
Why it's wrong here
The DH group is 14.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
Key term
FlexVPN
FlexVPN is a Cisco VPN solution that combines multiple VPN technologies (site-to-site, remote access, and hub-and-spoke) under a single, modular framework based on IKEv2.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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