hardMultiple ChoiceObjective-mapped
300-410 Practice Question: The default behavior for an IPv4 ACL applied to…
What is the default behavior for an IPv4 ACL applied to an outbound interface when the packet is generated by the router itself (e.g., ping from the router)?
⚠ Common exam trap
Cisco often tests the misconception that outbound ACLs apply to all traffic leaving an interface, including locally generated packets, leading candidates to incorrectly select Option A or C.
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
✓
The packet bypasses the outbound ACL and is forwarded directly.
When a router generates a packet (e.g., from a ping sourced from its own IP address), the packet is not subject to outbound ACL filtering. Instead, it is forwarded directly out the interface because the ACL is applied only to packets that are routed through the router, not to locally generated traffic. This behavior is consistent with Cisco IOS, where outbound ACLs inspect packets entering the router from another interface, not those originating from the router itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The outbound ACL filters the packet normally.
Why it's wrong here
Outbound ACLs do not apply to locally originated packets.
- ✓
The packet bypasses the outbound ACL and is forwarded directly.
Why this is correct
Locally generated packets are not subject to outbound ACL filtering.
- ✗
The packet is dropped by the implicit deny.
Why it's wrong here
The implicit deny only applies to transit traffic on outbound ACLs.
- ✗
The ACL is applied only if the packet matches a permit statement.
Why it's wrong here
Outbound ACLs do not process local traffic at all.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.