diff --git a/terraform/environments/dev/main.tf b/terraform/environments/dev/main.tf
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diff --git a/terraform/environments/dev/outputs.tf b/terraform/environments/dev/outputs.tf
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diff --git a/terraform/environments/dev/variables.tf b/terraform/environments/dev/variables.tf
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diff --git a/terraform/modules/compute/main.tf b/terraform/modules/compute/main.tf
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diff --git a/terraform/modules/compute/outputs.tf b/terraform/modules/compute/outputs.tf
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diff --git a/terraform/modules/compute/variables.tf b/terraform/modules/compute/variables.tf
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diff --git a/terraform/modules/iam/main.tf b/terraform/modules/iam/main.tf
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diff --git a/terraform/modules/iam/outputs.tf b/terraform/modules/iam/outputs.tf
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diff --git a/terraform/modules/iam/variables.tf b/terraform/modules/iam/variables.tf
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diff --git a/terraform/modules/network/main.tf b/terraform/modules/network/main.tf
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+++ b/terraform/modules/network/main.tf
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+# À vous de créer :
+# 1. Un VPC personnalisé avec auto_create_subnetworks = false
+resource "google_compute_network" "VPC" {
+    name = "vpc"
+    auto_create_subnetworks = false
+}
+
+# 2. Trois sous-réseaux (frontend, backend, database)
+resource "google_compute_subnetwork" "frontend" {
+    name          = "${var.project_name}-frontend"
+    ip_cidr_range = var.frontend_cidr
+    region        = var.region
+    network       = google_compute_network.vpc.id
+}
+resource "google_compute_subnetwork" "backend" {
+    name          = "${var.project_name}-backend"
+    ip_cidr_range = var.backend_cidr
+    region        = var.region
+    network       = google_compute_network.vpc.id
+}
+resource "google_compute_subnetwork" "database" {
+    name          = "${var.project_name}-database"
+    ip_cidr_range = var.database_cidr
+    region        = var.region
+    network       = google_compute_network.vpc.id
+}
+
+# 3. Règles de firewall :
+# HTTP/HTTPS → frontend
+resource "google_compute_firewall" "frontend_http" {
+    name    = "${var.project_name}-frontend-http"
+    network = google_compute_network.vpc.name
+
+    allow {
+        protocol = "tcp"
+        ports    = ["80", "443"]
+    }
+
+    target_tags = ["frontend"]
+    source_ranges = ["0.0.0.0/0"]
+}
+
+# SSH → all
+resource "google_compute_firewall" "ssh" {
+    name    = "${var.project_name}-ssh"
+    network = google_compute_network.vpc.name
+
+    allow {
+        protocol = "tcp"
+        ports    = ["22"]
+    }
+
+    target_tags   = ["ssh"]
+    source_ranges = ["0.0.0.0/0"]
+}
+
+# Port 8000 : frontend → backend
+resource "google_compute_firewall" "frontend_backend" {
+    name    = "${var.project_name}-frontend-to-backend"
+    network = google_compute_network.vpc.name
+
+    allow {
+        protocol = "tcp"
+        ports    = ["8000"]
+    }
+
+    source_tags = ["frontend"]
+    target_tags = ["backend"]
+}
+
+# Port 3306 : backend → database
+resource "google_compute_firewall" "backend_database" {
+    name    = "${var.project_name}-backend-to-database"
+    network = google_compute_network.vpc.name
+
+    allow {
+        protocol = "tcp"
+        ports    = ["3306"]
+    }
+
+    source_tags = ["backend"]
+    target_tags = ["database"]
+}
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diff --git a/terraform/modules/network/outputs.tf b/terraform/modules/network/outputs.tf
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+++ b/terraform/modules/network/outputs.tf
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+output "vpc_id" {
+  value = google_compute_network.vpc.id
+}
+
+output "subnet_ids" {
+  value = {
+    frontend = google_compute_subnetwork.frontend.id
+    backend  = google_compute_subnetwork.backend.id
+    database = google_compute_subnetwork.database.id
+  }
+}
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diff --git a/terraform/modules/network/variables.tf b/terraform/modules/network/variables.tf
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+++ b/terraform/modules/network/variables.tf
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+# À vous de définir les variables pour :
+# - project_name (string)
+# - region (string)
+# - frontend_cidr (string)
+# - backend_cidr (string)
+# - database_cidr (string)
+# - ssh_source_ranges (string)
+
+variable "project_name" {
+  description = "Nom du projet"
+  type = string
+  default = "Test IAC"
+}
+
+variable "region" {
+  description = "Nom de la région"
+  type = string
+  default = "europe-west9"
+}
+
+variable "frontend_cidr" {
+  description = "CIDR for frontend subnet"
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "backend_cidr" {
+  description = "CIDR for backend subnet"
+  type        = string
+  default     = "10.0.2.0/24"
+}
+
+variable "database_cidr" {
+  description = "CIDR for database subnet"
+  type        = string
+  default     = "10.0.3.0/24"
+}
+
+variable "ssh_source_ranges" {
+  description = "ssh_source_ranges"
+  type = string
+}
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