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Answer: Configure a target instance, and create a protocol forwarding rule for each external IP address to be mapped to the instance.
The requirements are to map multiple reserved external IPs to a Compute Engine instance and process ESP traffic (IP protocol 50). Protocol forwarding rules can be configured to forward ESP traffic to a target instance. Each protocol forwarding rule uses a reserved external IP and specifies the ESP protocol, directing traffic to the target instance. This setup allows the instance to handle ESP traffic across multiple reserved IPs. Options A and B involve load balancers (target pools or backend services), which are unnecessary for a single instance. Option D incorrectly suggests using ephemeral IPs and does not support multiple reserved IPs on a single interface. Option C correctly uses protocol forwarding rules with a target instance to meet both requirements.
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You are deploying an application on Compute Engine instances and need to expose it to a new customer while meeting the following requirements:
• Maps multiple existing reserved external IP addresses to the instance
• Processes IP Encapsulating Security Payload (ESP) traffic
What should you do?
A
Configure a target pool, and create protocol forwarding rules for each external IP address.
B
Configure a backend service, and create an external network load balancer for each external IP address.
C
Configure a target instance, and create a protocol forwarding rule for each external IP address to be mapped to the instance.
D
Configure the Compute Engine instances’ network interface external IP address from None to Ephemeral. Add as many external IP addresses as required.
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