diff --git a/samples/microsoft/infrastructure-setup/15-private-network-standard-agent-setup/azuredeploy.json b/samples/microsoft/infrastructure-setup/15-private-network-standard-agent-setup/azuredeploy.json
index ae7413e2..e7f02347 100644
--- a/samples/microsoft/infrastructure-setup/15-private-network-standard-agent-setup/azuredeploy.json
+++ b/samples/microsoft/infrastructure-setup/15-private-network-standard-agent-setup/azuredeploy.json
@@ -179,12 +179,28 @@
     },
     "existingDnsZones": {
       "type": "object",
+      "defaultValue": {
+        "privatelink.services.ai.azure.com": "",
+        "privatelink.openai.azure.com": "",
+        "privatelink.cognitiveservices.azure.com": "",
+        "privatelink.search.windows.net": "",
+        "privatelink.blob.core.windows.net": "",
+        "privatelink.documents.azure.com": ""
+      },
       "metadata": {
         "description": "Object mapping DNS zone names to their resource group, or empty string to indicate creation"
       }
     },
     "dnsZoneNames": {
       "type": "array",
+      "defaultValue": [
+        "privatelink.services.ai.azure.com",
+        "privatelink.openai.azure.com",
+        "privatelink.cognitiveservices.azure.com",
+        "privatelink.search.windows.net",
+        "privatelink.blob.core.windows.net",
+        "privatelink.documents.azure.com"
+      ],
       "metadata": {
         "description": "Zone Names for Validation of existing Private Dns Zones"
       }
@@ -2683,4 +2699,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}