diff --git a/specification/dnsresolver/resource-manager/Microsoft.Network/preview/2020-04-01-preview/dnsresolver.json b/specification/dnsresolver/resource-manager/Microsoft.Network/preview/2020-04-01-preview/dnsresolver.json
index 752bba35675d..10209d7c79cc 100644
--- a/specification/dnsresolver/resource-manager/Microsoft.Network/preview/2020-04-01-preview/dnsresolver.json
+++ b/specification/dnsresolver/resource-manager/Microsoft.Network/preview/2020-04-01-preview/dnsresolver.json
@@ -1830,6 +1830,9 @@
     "DnsResolver": {
       "description": "Describes a DNS resolver.",
       "type": "object",
+      "required":  [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the DNS resolver.",
@@ -1892,6 +1895,9 @@
     "InboundEndpointProperties": {
       "description": "Represents the properties of an inbound endpoint for a DNS resolver.",
       "type": "object",
+      "required": [
+        "ipConfigurations"
+      ],
       "properties": {
         "ipConfigurations": {
           "description": "IP configurations for the inbound endpoint.",
@@ -1916,6 +1922,9 @@
     "InboundEndpoint": {
       "description": "Describes an inbound endpoint for a DNS resolver.",
       "type": "object",
+      "required": [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the inbound endpoint.",
@@ -1978,6 +1987,9 @@
     "OutboundEndpointProperties": {
       "description": "Represents the properties of an outbound endpoint for a DNS resolver.",
       "type": "object",
+      "required": [
+        "subnet"
+      ],
       "properties": {
         "subnet": {
           "description": "The reference to the subnet used for the outbound endpoint.",
@@ -1998,6 +2010,9 @@
     "OutboundEndpoint": {
       "description": "Describes an outbound endpoint for a DNS resolver.",
       "type": "object",
+      "required": [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the outbound endpoint.",
@@ -2060,6 +2075,9 @@
     "DnsForwardingRulesetProperties": {
       "description": "Represents the properties of a DNS forwarding ruleset.",
       "type": "object",
+      "required": [
+        "dnsResolverOutboundEndpoints"
+      ],
       "properties": {
         "dnsResolverOutboundEndpoints": {
           "description": "The reference to the DNS resolver outbound endpoints that are used to route DNS queries matching the forwarding rules in the ruleset to the target DNS servers.",
@@ -2083,6 +2101,9 @@
     "DnsForwardingRuleset": {
       "description": "Describes a DNS forwarding ruleset.",
       "type": "object",
+      "required": [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the DNS forwarding ruleset.",
@@ -2110,6 +2131,13 @@
       "description": "Describes a DNS forwarding ruleset PATCH operation.",
       "type": "object",
       "properties": {
+         "dnsResolverOutboundEndpoints": {
+           "description": "The reference to the DNS resolver outbound endpoints that are used to route DNS queries matching the forwarding rules in the ruleset to the target DNS servers.",
+           "type": "array",
+           "items": {
+             "$ref": "#/definitions/SubResource"
+           }
+        },
         "tags": {
           "type": "object",
           "additionalProperties": {
@@ -2191,6 +2219,9 @@
     "ForwardingRule": {
       "description": "Describes a forwarding rule within a DNS forwarding ruleset.",
       "type": "object",
+      "required": [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the forwarding rule.",
@@ -2280,6 +2311,9 @@
     "VirtualNetworkLinkProperties": {
       "description": "Represents the properties of a virtual network link.",
       "type": "object",
+      "required": [
+        "virtualNetwork"
+      ],
       "properties": {
         "virtualNetwork": {
           "description": "The reference to the virtual network. This cannot be changed after creation.",
@@ -2302,6 +2336,9 @@
     "VirtualNetworkLink": {
       "description": "Describes a virtual network link.",
       "type": "object",
+      "required": [
+        "properties"
+      ],
       "properties": {
         "etag": {
           "description": "ETag of the virtual network link.",
@@ -2370,6 +2407,9 @@
     "IpConfiguration": {
       "description": "IP configuration.",
       "type": "object",
+      "required": [
+        "subnet"
+      ],
       "properties": {
         "subnet": {
           "description": "The reference to the subnet bound to the IP configuration.",
@@ -2397,6 +2437,9 @@
     "TargetDnsServer": {
       "description": "Describes a server to forward the DNS queries to.",
       "type": "object",
+      "required": [
+        "ipAddress"
+      ], 
       "properties": {
         "ipAddress": {
           "description": "DNS server IP address.",
@@ -2451,6 +2494,9 @@
     "SubResource": {
       "description": "Reference to another ARM resource.",
       "type": "object",
+      "required": [
+        "id"
+      ],
       "properties": {
         "id": {
           "type": "string",