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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# show crypto isakmp sa detail
Codes: C - IKE configuration mode, D - Dead Peer Detection I - IKE Initiatior, R - IKE Responder
C-id Local Remote I-VRF Status Encr Hash Auth DH Lifetime Cap. 1001 10.1.1.1 10.1.1.2 ACTIVE aes sha md5 2 86400 D
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between IKE Phase 1 and Phase 2 SAs, and candidates may confuse 'show crypto isakmp sa' (Phase 1) with 'show crypto ipsec sa' (Phase 2), leading them to incorrectly select option C.
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
✓
An IKE Phase 1 SA is established with the remote peer using AES encryption and SHA hash.
The output from 'show crypto isakmp sa detail' displays an IKE Phase 1 (ISAKMP) security association with status 'ACTIVE', indicating successful Phase 1 negotiation. The 'Encr' column shows 'aes', 'Hash' shows 'sha', and 'Auth' shows 'md5', confirming AES encryption and SHA hash are used. This matches option A, which correctly identifies an established IKE Phase 1 SA with those parameters.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
An IKE Phase 1 SA is established with the remote peer using AES encryption and SHA hash.
Why this is correct
The SA is ACTIVE with the specified parameters: aes encryption, sha hash, md5 auth, DH group 2.
- ✗
The IKE Phase 1 SA is in a failed state because the authentication method is MD5.
Why it's wrong here
The SA is ACTIVE, not failed; MD5 is a valid authentication method.
- ✗
The IKE Phase 2 SA is established with the remote peer.
Why it's wrong here
This is an IKE Phase 1 SA (isakmp), not Phase 2 (IPsec).
- ✗
The router is the initiator of the IKE Phase 1 SA.
Why it's wrong here
The 'I-VRF' column shows 'I' for initiator, but the output does not specify which side initiated; the 'C-id' column does not indicate initiator/responder.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.