Exam Terraform Associate topic 1 question 156 discussion

Answer is D. A dynamic block acts much like a for expression, but produces nested blocks instead of a complex typed value. It iterates over a given complex value, and generates a nested block for each element of that complex value. Reference: https://www.terraform.io/language/expressions/dynamic-blocks

resource "aws_security_group" "many_rules" { name = "many_rules" dynamic "ingress" { for_each = var.ingress_rules content { from_port = ingress.value.from_port to_port = ingress.value.to_port protocol = ingress.value.protocol cidr_blocks = ingress.value.cidr_blocks } } } variable "ingress_rules" { description = "A list of ingress rules" type = list(object({ from_port = number to_port = number protocol = string cidr_blocks = list(string) })) default = [ { from_port = 80 to_port = 80 protocol = "tcp" cidr_blocks = ["0.0.0.0/0"] }, # Add 41 more rules here... ] }

yep, D is correct.

Some additional information comparing each of the options: https://awstip.com/terraform-for-vs-for-each-7ff8506a1f94 Answer is definitely D as the question specifically mentions 'nested config(uration) blocks'

https://developer.hashicorp.com/terraform/tutorials/configuration-language/count

https://www.terraform.io/language/expressions/dynamic-blocks