hardMultiple SelectObjective-mapped
300-410 Practice Question: Which TWO statements about the behavior of IPv4…
Which TWO statements about the behavior of IPv4 ACLs with the 'established' keyword are true? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the misconception that the 'established' keyword performs stateful inspection or works with UDP, when in reality it is a simple stateless TCP flag check limited to extended 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
✓
The 'established' keyword matches TCP packets that have the ACK or RST bit set.
Only option A is true. The 'established' keyword matches TCP packets with the ACK or RST bit set. It is a stateless TCP flag check, cannot be used with UDP, and is not supported in standard ACLs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The 'established' keyword matches TCP packets that have the ACK or RST bit set.
Why this is correct
Correct. The 'established' keyword matches TCP packets that have the ACK or RST bit set, allowing return traffic for established sessions.
- ✗
The 'established' keyword can be applied to extended ACLs for UDP traffic to permit return packets.
Why it's wrong here
Incorrect. The 'established' keyword is specific to TCP; it cannot be applied to UDP traffic because UDP has no flags.
- ✗
The 'established' keyword checks the state of the session in the router's state table.
Why it's wrong here
Incorrect. The 'established' keyword is stateless; it does not check the router's state table but rather inspects the TCP flags in the packet header.
- ✗
The 'established' keyword can be used in both standard and extended ACLs.
Why it's wrong here
Correct. The 'established' keyword can be used in both standard and extended ACLs, though it is most commonly associated with extended ACLs.
- ✗
The 'established' keyword will match a TCP SYN packet sent from a client to initiate a connection.
Why it's wrong here
Incorrect. The 'established' keyword will not match a TCP SYN packet because a SYN packet typically has only the SYN flag set, not ACK or RST.
Visual reference
Go deeper
Related to this question
About these practice questions
One of 1,966 original 300-410 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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.