JNCIA-SEC Security Policies Practice Question
An administrator configures a security policy with the action set to 'reject'. Another policy uses the action 'deny'. What is the functional difference between these two actions when a packet matches the policy?
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
✓
'reject' sends an ICMP unreachable message back to the packet source, whereas 'deny' silently drops the packet.
The 'reject' action sends an ICMP unreachable message back to the source, whereas 'deny' (drop) silently discards the packet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
'reject' drops the packet silently, whereas 'deny' sends an ICMP unreachable message.
Why it's wrong here
Incorrect. This reverses the behavior of the two actions.
- ✓
'reject' sends an ICMP unreachable message back to the packet source, whereas 'deny' silently drops the packet.
Why this is correct
Correct. 'reject' sends a notification back, while 'deny' silently drops.
- ✗
'reject' logs the event to the system log, whereas 'deny' suppresses all logging.
Why it's wrong here
Incorrect. Logging is controlled separately by the 'log' modifier on either action.
- ✗
'reject' requires stateful session tracking, whereas 'deny' is applied statelessly.
Why it's wrong here
Incorrect. Both actions are enforced statefully within security policy processing.
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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 JNCIA-SEC 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 JNCIA-SEC exam.