diff --git a/lib/kitchen/driver/azurerm.rb b/lib/kitchen/driver/azurerm.rb
index 738ed7e..76486c8 100644
--- a/lib/kitchen/driver/azurerm.rb
+++ b/lib/kitchen/driver/azurerm.rb
@@ -220,9 +220,7 @@ class Azurerm < Kitchen::Driver::Base
         false
       end
 
-      default_config(:zone) do |_config|
-        "1"
-      end
+      default_config :zone, nil
 
       def create(state)
         state = validate_state(state)
diff --git a/spec/unit/kitchen/driver/azurerm_spec.rb b/spec/unit/kitchen/driver/azurerm_spec.rb
index d8659ab..7cd7280 100644
--- a/spec/unit/kitchen/driver/azurerm_spec.rb
+++ b/spec/unit/kitchen/driver/azurerm_spec.rb
@@ -107,8 +107,8 @@
       expect(default_config[:public_ip_sku]).to eq("Basic")
     end
 
-    it "Should use 1 availability zone" do
-      expect(default_config[:zone]).to eq("1")
+    it "should set zone to nil" do
+      expect(default_config[:zone]).to eq(nil)
     end
 
     it "should set store_deployment_credentials_in_state to true" do
@@ -257,43 +257,78 @@
     let(:parsed_json) { JSON.parse(subject) }
     let(:vm_resource) { parsed_json["resources"].find { |x| x["type"] == "Microsoft.Compute/virtualMachines" } }
 
-    context "when plan config is provided" do
-      let(:plan_name) { "plan-abc" }
-      let(:plan_product) { "my-product" }
-      let(:plan_publisher) { "captain-america" }
-      let(:plan_promotion_code) { "50-percent-off" }
-
-      let(:plan) do
-        {
-          name: plan_name,
-          product: plan_product,
-          publisher: plan_publisher,
-          promotion_code: plan_promotion_code,
-        }
-      end
-
+    context "when vnet_id is not provided" do
       let(:config) do
         {
           subscription_id: subscription_id,
           location: location,
           machine_size: machine_size,
           vm_tags: vm_tags,
-          plan: plan,
           image_urn: image_urn,
           vm_name: vm_name,
         }
       end
 
-      it "includes plan information in deployment template" do
-        expect(vm_resource).to have_key("plan")
-        expect(vm_resource["plan"]["name"]).to eq(plan_name)
-        expect(vm_resource["plan"]["product"]).to eq(plan_product)
-        expect(vm_resource["plan"]["publisher"]).to eq(plan_publisher)
-        expect(vm_resource["plan"]["promotionCode"]).to eq(plan_promotion_code)
+      it 'uses public template' do
+        expect(driver).to receive(:virtual_machine_deployment_template_file).with("public.erb", any_args)
+        subject
+      end
+
+      context "when plan config is provided" do
+        let(:plan_name) { "plan-abc" }
+        let(:plan_product) { "my-product" }
+        let(:plan_publisher) { "captain-america" }
+        let(:plan_promotion_code) { "50-percent-off" }
+
+        let(:plan) do
+          {
+            name: plan_name,
+            product: plan_product,
+            publisher: plan_publisher,
+            promotion_code: plan_promotion_code,
+          }
+        end
+
+        let(:config) do
+          {
+            subscription_id: subscription_id,
+            location: location,
+            machine_size: machine_size,
+            vm_tags: vm_tags,
+            plan: plan,
+            image_urn: image_urn,
+            vm_name: vm_name,
+          }
+        end
+
+        it "includes plan information in deployment template" do
+          expect(vm_resource).to have_key("plan")
+          expect(vm_resource["plan"]["name"]).to eq(plan_name)
+          expect(vm_resource["plan"]["product"]).to eq(plan_product)
+          expect(vm_resource["plan"]["publisher"]).to eq(plan_publisher)
+          expect(vm_resource["plan"]["promotionCode"]).to eq(plan_promotion_code)
+        end
+      end
+
+      context "when plan config is not provided" do
+        let(:config) do
+          {
+            subscription_id: subscription_id,
+            location: location,
+            machine_size: machine_size,
+            vm_tags: vm_tags,
+            image_urn: image_urn,
+            vm_name: vm_name,
+          }
+        end
+
+        it "does not include plan information in deployment template" do
+          expect(vm_resource).not_to have_key("plan")
+        end
       end
     end
 
-    context "when plan config is not provided" do
+    context "when vnet_id is provided" do
       let(:config) do
         {
           subscription_id: subscription_id,
@@ -302,11 +337,13 @@
           vm_tags: vm_tags,
           image_urn: image_urn,
           vm_name: vm_name,
+          vnet_id: "vnet-1234",
         }
       end
 
-      it "does not include plan information in deployment template" do
-        expect(vm_resource).not_to have_key("plan")
+      it 'uses internal template' do
+        expect(driver).to receive(:virtual_machine_deployment_template_file).with("internal.erb", any_args)
+        subject
       end
     end
   end
diff --git a/templates/internal.erb b/templates/internal.erb
index ac585f4..0119665 100644
--- a/templates/internal.erb
+++ b/templates/internal.erb
@@ -8,18 +8,6 @@
                 "description": "The location where the resources will be created."
             }
         },
-        "zone": {
-            "type": "string",
-            "defaultValue": "1",
-            "allowedValues": [
-                "1",
-                "2",
-                "3"
-            ],
-            "metadata": {
-                "description": "Zone number for the virtual machine"
-            }
-        },
         "vmSize": {
             "type": "string",
             "metadata": {
@@ -220,7 +208,9 @@
     },
     "variables": {
         "location": "[parameters('location')]",
-        "zone": "[parameters('zone')]",
+        <% unless zone.nil? %>
+        "zone": "<%= zone -%>",
+        <% end %>
         "OSDiskName": "osdisk",
         "nicName": "[parameters('nicName')]",
         "addressPrefix": "10.0.0.0/16",
@@ -272,9 +262,11 @@
             "type": "Microsoft.Network/publicIPAddresses",
             "name": "[variables('publicIPAddressName')]",
             "location": "[variables('location')]",
+            <% unless zone.nil? %>
             "zones": [
-                "[variables('zone')]"
+                "<%= zone -%>"
             ],
+            <% end %>
             "sku": {
               "name": "[parameters('publicIPSKU')]"
             },
@@ -326,9 +318,11 @@
             "type": "Microsoft.Compute/virtualMachines",
             "name": "[variables('vmName')]",
             "location": "[variables('location')]",
+            <% unless zone.nil? %>
             "zones": [
-                "[variables('zone')]"
+                "<%= zone -%>"
             ],
+            <% end %>
             "dependsOn": [
                 <%- unless use_managed_disks -%>
                 <%- if existing_storage_account_blob_url.empty? -%>