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GCP Associate Cloud Engineer Practice Question

Your VPC contains two managed instance groups in the same region. Instances in the bastion group are created with the service account bastion-sa, and instances in the application group are created with the service account app-sa. You must allow administrators to open SSH sessions (TCP port 22) from the bastion hosts to the application hosts while blocking SSH traffic that originates from any other source. You want to meet the requirement without relying on fixed IP ranges or network tags. What should you do?

  • Create a single ingress firewall rule that applies to instances with the app-sa service account, sets the source service account to bastion-sa, and allows tcp:22.

  • Create an egress firewall rule that applies to instances with the bastion-sa service account, sets the destination service account to app-sa, and allows tcp:22.

  • Add a network tag "bastion" to the bastion instances and an "app" tag to the application instances. Create an ingress rule that allows tcp:22 from source tag "bastion" to target tag "app".

  • Enable OS Login and grant the bastion-sa service account the Compute OS Admin Login IAM role on the project; no firewall rule changes are required.

GCP Associate Cloud Engineer
Planning and implementing a cloud solution
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