This CKAD practice question tests your understanding of services and networking. 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.
A NetworkPolicy is applied to a namespace with the following rules: ``` apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: deny-all spec: podSelector: {} policyTypes: - Ingress ``` What is the effect on pods in that namespace?
All inbound traffic is denied, outbound traffic is allowed
Correct.
All traffic is allowed
Why wrong: The policy denies ingress traffic.
Only traffic from specific namespaces is allowed
Why wrong: No allow rules are defined.
All inbound and outbound traffic is denied
Why wrong: Only ingress is denied; egress is not affected because only Ingress is listed under policyTypes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
All inbound traffic is denied, outbound traffic is allowed
This policy selects all pods and only specifies Ingress, so all incoming traffic to pods is denied unless other policies allow it. Egress is unaffected.
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.
All inbound traffic is denied, outbound traffic is allowed
Why this is correct
Correct.
Related concept
Standard ACLs match source addresses.
All traffic is allowed
Why it's wrong here
The policy denies ingress traffic.
Only traffic from specific namespaces is allowed
Why it's wrong here
No allow rules are defined.
All inbound and outbound traffic is denied
Why it's wrong here
Only ingress is denied; egress is not affected because only Ingress is listed under policyTypes.
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 CKAD ACL questions on filtering logic and placement.
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FAQ
Services and Networking — This question tests Services and Networking — Standard ACLs match source addresses..
The correct answer is: All inbound traffic is denied, outbound traffic is allowed — This policy selects all pods and only specifies Ingress, so all incoming traffic to pods is denied unless other policies allow it. Egress is unaffected.
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 CKAD ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 21, 2026
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