- A
Contracts with filters and subjects
Contracts specify allowed traffic between EPGs.
- B
Shared L3Out
Why wrong: L3Out is for external connectivity.
- C
VRF route leaking
Why wrong: VRF route leaking is used for inter-VRF, not between EPGs in same VRF.
- D
VMM domain integration
Why wrong: VMM domain integrates with hypervisor, not for inter-EPG communication.
Question 489 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. 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 a Cisco ACI fabric, a tenant has multiple bridge domains with different subnets. The administrator wants to allow traffic between two EPGs in the same tenant but different bridge domains. Which ACI construct is required to enable communication?
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
✓
Contracts with filters and subjects
In Cisco ACI, EPGs in different bridge domains are isolated by default. To enable communication between them, a contract must be applied that defines the allowed traffic. Contracts use filters and subjects to specify permitted protocols and ports, and are the only native ACI mechanism for inter-EPG communication across bridge domains within the same tenant.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Contracts with filters and subjects
Why this is correct
Contracts specify allowed traffic between EPGs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Shared L3Out
Why it's wrong here
L3Out is for external connectivity.
- ✗
VRF route leaking
Why it's wrong here
VRF route leaking is used for inter-VRF, not between EPGs in same VRF.
- ✗
VMM domain integration
Why it's wrong here
VMM domain integrates with hypervisor, not for inter-EPG communication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that EPGs in the same tenant can communicate without a contract, but in ACI, all inter-EPG traffic (even within the same tenant) requires a contract unless the EPGs are in the same bridge domain and have unicast routing enabled.
Detailed technical explanation
How to think about this question
Contracts in ACI operate at Layer 4–7, using filters that reference protocols (e.g., TCP, UDP, ICMP) and port ranges. The contract is applied to a consumer/provider relationship between EPGs, and the ACI leaf switches enforce the policy via hardware ACLs in the forwarding ASICs. A real-world scenario is a multi-tier application where a web EPG in one bridge domain must communicate with an app EPG in another; a contract with the appropriate filters (e.g., HTTP on TCP 80) is required.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Contracts with filters and subjects — In Cisco ACI, EPGs in different bridge domains are isolated by default. To enable communication between them, a contract must be applied that defines the allowed traffic. Contracts use filters and subjects to specify permitted protocols and ports, and are the only native ACI mechanism for inter-EPG communication across bridge domains within the same tenant.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 350-601 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 350-601 exam.
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