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350-601 Security Practice Question

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?

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

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.

Answer analysis

Option-by-option breakdown

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.

  • 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.

Visual reference

Source Router + ACL permit 10.0.0.0/8 deny any Server 10.0.0.5 ✓ 192.168.1.1 ✗ dropped ACLs evaluate top-down; first match wins — implicit deny all at end

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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