JNCIS-ENT Layer 2 Security Practice Question
An administrator wants to deploy MACsec between two EX Series switches using MKA with pre-shared keys. Which THREE configuration steps must be performed on both switches? (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
✓
Enable MACsec on the physical interface.
Configuring MACsec with PSK requires enabling MACsec on the interface, defining connectivity association keys (CAK) and key names (CKN), and selecting the cipher suite or interface 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.
- ✓
Enable MACsec on the physical interface.
Why this is correct
MACsec must be explicitly enabled on the target interfaces.
- ✗
Configure the interface as a trusted port for Dynamic ARP Inspection.
Why it's wrong here
DAI trust settings are unrelated to MACsec encryption setup.
- ✓
Configure matching Connectivity Association Key (CAK) and Connectivity Key Name (CKN).
Why this is correct
Matching pre-shared keys (CAK and CKN) are required for MKA session establishment.
- ✗
Enable DHCP snooping on the transit VLAN.
Why it's wrong here
DHCP snooping is an access layer feature and is not required for MACsec.
- ✓
Configure security association parameters or cipher suites if deviating from defaults.
Why this is correct
Configuring cipher suites or association parameters ensures both peers negotiate encryption correctly.
About these practice questions
This JNCIS-ENT question is part of Courseiva's 506-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.