- A
Create a contract with a subject that includes a filter for HTTP only
Contracts allow traffic; only the HTTP filter is applied, implicitly denying others.
- B
Use an external firewall for filtering
Why wrong: The question asks for ACI policy elements.
- C
Create a taboo contract to deny all traffic and a separate contract to allow HTTP
Why wrong: Taboo contracts deny specific traffic, but the whitelist model uses contracts to allow, not deny.
- D
Create a filter for HTTP and apply it directly to the EPGs
Why wrong: Filters must be part of a contract subject.
Question 109 of 1,000
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
In ACI, a tenant requires that all traffic between two EPGs is denied except for specific HTTP traffic. Which policy elements must be configured?
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
✓
Create a contract with a subject that includes a filter for HTTP only
ACI uses a whitelist model. To allow only HTTP, a contract with a subject and filter for HTTP is applied, and no other filters are included.
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a contract with a subject that includes a filter for HTTP only
Why this is correct
Contracts allow traffic; only the HTTP filter is applied, implicitly denying others.
Related concept
Standard ACLs match source addresses.
- ✗
Use an external firewall for filtering
Why it's wrong here
The question asks for ACI policy elements.
- ✗
Create a taboo contract to deny all traffic and a separate contract to allow HTTP
Why it's wrong here
Taboo contracts deny specific traffic, but the whitelist model uses contracts to allow, not deny.
- ✗
Create a filter for HTTP and apply it directly to the EPGs
Why it's wrong here
Filters must be part of a contract subject.
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.
Visual reference
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 350-601 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this 350-601 question test?
Security — This question tests Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a contract with a subject that includes a filter for HTTP only — ACI uses a whitelist model. To allow only HTTP, a contract with a subject and filter for HTTP is applied, and no other filters are included.
What should I do if I get this 350-601 question wrong?
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 350-601 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
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