JNCIS-ENT Layer 2 Security Practice Question
An administrator implements MACsec to secure links between switches. Which THREE operational tasks or verifications are relevant when troubleshooting MACsec and MKA? (Choose three)
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
✓
Verifying MKA peer connectivity state using 'show macsec connections'.
Troubleshooting MACsec involves checking MKA session status, connectivity associations, and encryption/decryption statistics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensuring Layer 2 firewall filters are blocking MACsec EtherType 0x88E5.
Why it's wrong here
Blocking EtherType 0x88E5 would prevent MACsec from functioning entirely.
- ✓
Verifying MKA peer connectivity state using 'show macsec connections'.
Why this is correct
This command shows active MKA sessions and peer connectivity.
- ✗
Inspecting DHCP binding tables to verify MACsec key distribution.
Why it's wrong here
DHCP binding tables have no relation to MACsec key distribution.
- ✓
Verifying that pre-shared key (CAK and CKN) configurations match on both peer switches.
Why this is correct
Matching CAK and CKN settings are essential for successful MKA session establishment.
- ✓
Checking encryption and decryption packet error counters.
Why this is correct
Error counters help identify cryptographic or key mismatch issues.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIS-ENT practice question is part of Courseiva's free Juniper Networks 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 JNCIS-ENT exam.