GCP Associate Cloud Engineer Practice Question

You run a multi-zone Compute Engine web application behind a global external HTTP(S) load balancer that currently uses Premium Tier. Billing analysis shows that 95 % of traffic originates from the United States, and management asks you to reduce egress costs even if a small increase in latency is acceptable. You want to keep a managed HTTPS load-balancing service and make the smallest possible architectural change. What should you do?

Deploy a new regional external HTTP(S) load balancer in a U.S. region with a Standard Tier IP address, point it at the existing backend service, and update DNS to use the new regional IP.
Keep the current Premium Tier global load balancer but enable Cloud CDN to reduce egress charges.
Change the network tier of the existing global external HTTP(S) load balancer's forwarding rule from Premium to Standard.
Move the application's VM instances to Standard Tier while continuing to use the same global external HTTP(S) load balancer.

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Answer Description

Premium Tier keeps user traffic on Google's private backbone until it reaches the closest Google point of presence and supports global external HTTP(S) load balancing. Standard Tier is less expensive but only supports regional external HTTP(S) load balancers. Because you cannot downgrade an existing global load balancer to Standard Tier and Standard Tier does not support global load balancing, the least disruptive cost-saving action is to create a new regional external HTTP(S) load balancer in a U.S. region using Standard Tier, attach the existing backend service to it, reserve a regional Standard Tier IP address, and update DNS to direct traffic to the new address. The other options either attempt an unsupported network-tier change on a global load balancer or make no change to the network tier, so they do not meet the cost-reduction goal.

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