5b Describe Variable Scope Within Modules TERRAFORM-ASSOCIATE-004 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A module creates a VPC and defines `output "vpc_id" { value = aws_vpc.this.id }`. The root configuration references `module.vpc.vpc_id` in a resource. The module is later refactored to use a local value `vpc_id` instead of the resource attribute directly in the output. What must be done to keep the root configuration working?

   • AChange the root reference to `module.vpc.vpc_id_local`.
   • BReference the local value directly from the root as `module.vpc.vpc_id`.
   • CNothing; update the output's value to reference the local value.
   • DRemove the output and use a variable instead.
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2. 22expert · medium

   A team maintains a module that provisions a load balancer. The module declares `variable "listener_port" { type = number }` and `output "listener_arn" { value = aws_lb_listener.this.arn }`. The root configuration passes `listener_port = 443`. Later, the team wants the root configuration to also know the listener's protocol, which is hardcoded as `HTTPS` inside the module. What is the minimal change to expose the protocol to the root configuration?

   • AAdd `output "listener_protocol" { value = "HTTPS" }` to the module.
   • BMove the protocol to a local and reference it from the root.
   • CAdd `variable "listener_protocol" { default = "HTTPS" }` to the module.
   • DReference `module.lb.listener_protocol` in the root without any module change.
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4. 23application · medium

   A module declares `variable "instance_type" { type = string }` with no default. The root configuration calls the module and passes `instance_type = "t3.micro"`. Later, the root configuration is modified to remove that argument from the module block. What happens on the next plan?

   • AThe module uses an empty string for `instance_type`.
   • BThe module falls back to the root variable of the same name.
   • CTerraform errors because `instance_type` is required and not set.
   • DThe module uses the previously applied value from state.
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5. 24foundation · easy

   Which block is used to pass values from the parent configuration into a module's input variables?

   • Aoutput
   • Bmodule
   • Cvariable
   • Dlocals
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6. 25expert · easy

   A root configuration has `variable "tags" { default = { Env = "dev" } }`. It calls a module that declares `variable "tags" { type = map(string) }` with no default. The module block passes `tags = { Env = "prod" }`. Inside the module, a resource uses `var.tags`. What value does the resource see?

   • A{ Env = "dev" }
   • B{ Env = "prod" }
   • CAn error because the root and module variables have the same name.
   • DAn empty map
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