This 350-601 practice question tests your understanding of 350-601 exam topics. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 an ACI fabric, a security policy requires that traffic from EPG1 to EPG2 be denied, but all other inter-EPG traffic is permitted by default. Which type of contract should be used?
Taboo contract
Taboo contracts explicitly deny specified traffic between EPGs.
No contract
Why wrong: Without a contract, no traffic is permitted; but the requirement is to deny specifically, not to block all.
Regular contract with a deny filter
Why wrong: Regular contracts only permit traffic; they cannot deny.
Intra-EPG contract
Why wrong: Intra-EPG contracts are for traffic within the same EPG.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Taboo contract
Taboo contracts are used to explicitly deny traffic between EPGs, overriding the default permit of a contract? Actually, by default, no traffic is permitted between EPGs unless a contract is applied. A taboo contract denies traffic, even if a regular contract exists? In ACI, the default is no communication; contracts permit traffic. To deny specific traffic, you use a taboo contract that explicitly denies.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Taboo contract
Why this is correct
Taboo contracts explicitly deny specified traffic between EPGs.
Related concept
Standard ACLs match source addresses.
No contract
Why it's wrong here
Without a contract, no traffic is permitted; but the requirement is to deny specifically, not to block all.
Regular contract with a deny filter
Why it's wrong here
Regular contracts only permit traffic; they cannot deny.
Intra-EPG contract
Why it's wrong here
Intra-EPG contracts are for traffic within the same EPG.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
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
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
Standard ACLs match source addresses.
The correct answer is: Taboo contract — Taboo contracts are used to explicitly deny traffic between EPGs, overriding the default permit of a contract? Actually, by default, no traffic is permitted between EPGs unless a contract is applied. A taboo contract denies traffic, even if a regular contract exists? In ACI, the default is no communication; contracts permit traffic. To deny specific traffic, you use a taboo contract that explicitly denies.
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.
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
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