Question 1,132 of 2,015

ACLs and CoPP →mediumDrag & DropObjective-mapped

Quick Answer

The answer is to apply the inbound ACL to the same interface, but only after evaluating outbound traffic and creating the reflexive entry. This order is correct because a reflexive ACL, also known as dynamic inspection, works by first inspecting outbound packets to dynamically generate a temporary permit entry for the return traffic; that entry is then inserted into the inbound ACL on the same interface, allowing only the corresponding reply packets back in. On the ENCOR 350-401 exam, this concept often appears as a drag-and-drop sequence testing your understanding of stateful filtering logic, with a common trap being the mistaken belief that the inbound ACL is applied first. To avoid this, remember the key principle: outbound traffic must be seen before the inbound rule can be created. A simple memory tip is "Out first, then in" — think of it as the router needing to see the conversation start before it can let the reply through.

350-401 ACLs and CoPP Practice Question

This 350-401 practice question tests your understanding of acls and copp. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Drag and drop the steps of ACL reflexive access list (dynamic inspection) flow into the correct order, from first to last.

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

Question 1mediumdrag order

Study the full ACL explanation →

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

✓

Configure outbound ACL with 'reflect' keyword

Reflexive ACLs work by evaluating outbound traffic, creating a reflexive entry, then applying inbound ACL to permit return traffic. The order ensures proper dynamic inspection.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this 350-401 question test?

ACLs and CoPP — This question tests ACLs and CoPP — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Configure outbound ACL with 'reflect' keyword — Reflexive ACLs work by evaluating outbound traffic, creating a reflexive entry, then applying inbound ACL to permit return traffic. The order ensures proper dynamic inspection.

What should I do if I get this 350-401 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Same concept, more angles

1 more ways this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Drag and drop the steps of ACL reflexive access list (dynamic inspection) flow into the correct order, from first to last.

medium

✓ A.Configure extended ACL for outbound traffic
✓ B.Apply outbound ACL to interface
✓ C.Define reflexive ACL with evaluate keyword
✓ D.Apply reflexive ACL inbound to interface
✓ E.Outbound packet triggers dynamic permit entry

Why A: Reflexive ACLs work by evaluating outbound traffic to create dynamic entries that allow return traffic. The order is: define extended ACL, apply outbound, define reflexive ACL, apply inbound, then the reflexive entry is created dynamically.

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