# ListCoreNetworkPolicyVersions
<a name="API_ListCoreNetworkPolicyVersions"></a>

Returns a list of core network policy versions.

## Request Syntax
<a name="API_ListCoreNetworkPolicyVersions_RequestSyntax"></a>

```
GET /core-networks/coreNetworkId/core-network-policy-versions?maxResults=MaxResults&nextToken=NextToken HTTP/1.1
```

## URI Request Parameters
<a name="API_ListCoreNetworkPolicyVersions_RequestParameters"></a>

The request uses the following URI parameters.

 ** [coreNetworkId](#API_ListCoreNetworkPolicyVersions_RequestSyntax) **   <a name="networkmanager-ListCoreNetworkPolicyVersions-request-uri-CoreNetworkId"></a>
The ID of a core network.  
Length Constraints: Minimum length of 0. Maximum length of 50.  
Pattern: `^core-network-([0-9a-f]{8,17})$`   
Required: Yes

 ** [MaxResults](#API_ListCoreNetworkPolicyVersions_RequestSyntax) **   <a name="networkmanager-ListCoreNetworkPolicyVersions-request-uri-MaxResults"></a>
The maximum number of results to return.  
Valid Range: Minimum value of 1. Maximum value of 500.

 ** [NextToken](#API_ListCoreNetworkPolicyVersions_RequestSyntax) **   <a name="networkmanager-ListCoreNetworkPolicyVersions-request-uri-NextToken"></a>
The token for the next page of results.  
Length Constraints: Minimum length of 0. Maximum length of 2048.  
Pattern: `[\s\S]*` 

## Request Body
<a name="API_ListCoreNetworkPolicyVersions_RequestBody"></a>

The request does not have a request body.

## Response Syntax
<a name="API_ListCoreNetworkPolicyVersions_ResponseSyntax"></a>

```
HTTP/1.1 200
Content-type: application/json

{
   "CoreNetworkPolicyVersions": [ 
      { 
         "Alias": "string",
         "ChangeSetState": "string",
         "CoreNetworkId": "string",
         "CreatedAt": number,
         "Description": "string",
         "PolicyVersionId": number
      }
   ],
   "NextToken": "string"
}
```

## Response Elements
<a name="API_ListCoreNetworkPolicyVersions_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [CoreNetworkPolicyVersions](#API_ListCoreNetworkPolicyVersions_ResponseSyntax) **   <a name="networkmanager-ListCoreNetworkPolicyVersions-response-CoreNetworkPolicyVersions"></a>
Describes core network policy versions.  
Type: Array of [CoreNetworkPolicyVersion](API_CoreNetworkPolicyVersion.md) objects

 ** [NextToken](#API_ListCoreNetworkPolicyVersions_ResponseSyntax) **   <a name="networkmanager-ListCoreNetworkPolicyVersions-response-NextToken"></a>
The token for the next page of results.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 2048.  
Pattern: `[\s\S]*` 

## Errors
<a name="API_ListCoreNetworkPolicyVersions_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** AccessDeniedException **   
You do not have sufficient access to perform this action.  
HTTP Status Code: 403

 ** InternalServerException **   
The request has failed due to an internal error.    
 ** RetryAfterSeconds **   
Indicates when to retry the request.
HTTP Status Code: 500

 ** ResourceNotFoundException **   
The specified resource could not be found.    
 ** Context **   
The specified resource could not be found.  
 ** ResourceId **   
The ID of the resource.  
 ** ResourceType **   
The resource type.
HTTP Status Code: 404

 ** ThrottlingException **   
The request was denied due to request throttling.    
 ** RetryAfterSeconds **   
Indicates when to retry the request.
HTTP Status Code: 429

 ** ValidationException **   
The input fails to satisfy the constraints.    
 ** Fields **   
The fields that caused the error, if applicable.  
 ** Reason **   
The reason for the error.
HTTP Status Code: 400

## See Also
<a name="API_ListCoreNetworkPolicyVersions_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/networkmanager-2019-07-05/ListCoreNetworkPolicyVersions)