Kubernetes - Networking
Why does a Kubernetes NetworkPolicy with no egress rules block all outbound traffic by default?
Why does a Kubernetes NetworkPolicy with no egress rules block all outbound traffic by default?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand NetworkPolicy default deny behavior
When policyTypes includes Egress, any traffic not explicitly allowed is denied.Step 2: Clarify effect of no egress rules
Having no egress rules means no allowed outbound traffic, so all egress is blocked.Final Answer:
Specifying policyTypes disables all traffic not explicitly allowed -> Option CQuick Check:
Explicit policyTypes cause default deny for unspecified traffic [OK]
Quick Trick: Explicit policyTypes cause default deny for unspecified traffic [OK]
Common Mistakes:
- Thinking egress is allowed by default always
- Believing NetworkPolicy only controls ingress
- Assuming pods ignore incomplete policies
Master "Networking" in Kubernetes
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