def create_network_acl(DryRun=None, VpcId=None):
    """
    Creates a network ACL in a VPC. Network ACLs provide an optional layer of security (in addition to security groups) for the instances in your VPC.
    For more information about network ACLs, see Network ACLs in the Amazon Virtual Private Cloud User Guide .
    See also: AWS API Documentation
    
    Examples
    This example creates a network ACL for the specified VPC.
    Expected Output:
    
    :example: response = client.create_network_acl(
        DryRun=True|False,
        VpcId='string'
    )
    
    
    :type DryRun: boolean
    :param DryRun: Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation . Otherwise, it is UnauthorizedOperation .

    :type VpcId: string
    :param VpcId: [REQUIRED]
            The ID of the VPC.
            

    :rtype: dict
    :return: {
        'NetworkAcl': {
            'NetworkAclId': 'string',
            'VpcId': 'string',
            'IsDefault': True|False,
            'Entries': [
                {
                    'RuleNumber': 123,
                    'Protocol': 'string',
                    'RuleAction': 'allow'|'deny',
                    'Egress': True|False,
                    'CidrBlock': 'string',
                    'Ipv6CidrBlock': 'string',
                    'IcmpTypeCode': {
                        'Type': 123,
                        'Code': 123
                    },
                    'PortRange': {
                        'From': 123,
                        'To': 123
                    }
                },
            ],
            'Associations': [
                {
                    'NetworkAclAssociationId': 'string',
                    'NetworkAclId': 'string',
                    'SubnetId': 'string'
                },
            ],
            'Tags': [
                {
                    'Key': 'string',
                    'Value': 'string'
                },
            ]
        }
    }
    
    
    """
    pass
