The Kubernetes yaml shown below describes a networkPolicy. Will the networkPolicy BLOCK this traffic? Solution: a request issued from a pod bearing the tier: backend label, to a pod bearing the…

If the traffic were blocked, the NetworkPolicy would need to select the destination pod and lack an `ingress` rule permitting traffic from `tier: backend`, or select the source pod and lack an `egress` rule permitting traffic to `tier: frontend`.

Given that the traffic is not blocked, the NetworkPolicy either does not select the destination `tier: frontend` pod, meaning all ingress traffic to it is allowed by default. Alternatively, if a policy does select the `tier: frontend` pod, its `ingress` rules must explicitly permit traffic from pods with the `tier: backend` label, or the source pod's `egress` rules allow traffic to `tier: frontend`.