PCNE Configuring Network Services Practice Question
Which TWO of the following are required when setting up an internal TCP/UDP load balancer (ILB) in a shared VPC environment?
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
✓
A health check must be configured for the backend service.
Correct answers: A and D. A: A health check is mandatory for an internal TCP/UDP load balancer (ILB) backend service to determine instance health. D: The ILB forwarding rule must be in the same region as the backend instances because ILB is a regional load balancer. B: Incorrect. ILB does not use proxy-only subnets; firewall rules for proxy-only subnets are required only for load balancers that use Envoy proxies (e.g., HTTP(S) LB). C: Incorrect. While the forwarding rule's IP address is taken from a subnet in the shared VPC (owned by the host project), this is not a separate requirement; the critical requirement is that the forwarding rule and backends are in the same region. E: Incorrect. Global routing is not needed for ILB; it operates within a single region.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A health check must be configured for the backend service.
Why this is correct
Health checks are required to determine instance health.
- ✗
A firewall rule must allow traffic from the proxy-only subnet.
Why it's wrong here
ILB uses the health check firewall rules, not a proxy subnet.
- ✗
The forwarding rule's IP address must be from the host project's subnet.
Why it's wrong here
The IP can be from any subnet in the service project.
- ✓
The load balancer forwarding rule must be in the same region as the backend instances.
Why this is correct
ILB is regional.
- ✗
Global routing must be enabled in the VPC.
Why it's wrong here
ILB does not require global routing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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