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300-410 Practice Question: The maximum number of entries that can be…
What is the maximum number of entries that can be configured in a single IPv4 ACL in Cisco IOS?
⚠ Common exam trap
Cisco often tests the 1000-entry limit to catch candidates who assume ACLs are unlimited or who confuse the limit with the 256-entry limit common on older Catalyst switch ACLs.
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
✓
1000
Cisco IOS limits a single IPv4 ACL to a maximum of 1000 entries (ACE lines) to prevent performance degradation and excessive memory consumption on the router. This hard limit applies to both standard and extended numbered ACLs, as well as named ACLs, and is enforced by the software to ensure predictable forwarding behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
1000
Why this is correct
Cisco IOS generally supports up to 1000 ACEs per ACL, though hardware limits may be lower.
- ✗
500
Why it's wrong here
500 is not the standard maximum; 1000 is more common.
- ✗
Unlimited
Why it's wrong here
There is a finite limit; unlimited is incorrect.
- ✗
256
Why it's wrong here
256 is too low; the limit is higher.
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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.