code: def _set_cdn_defaults(self):
          
          if self._cdn_enabled is FAULT:
              self._cdn_enabled = False
          self._cdn_uri = None
          self._cdn_ttl = DEFAULT_CDN_TTL
          self._cdn_ssl_uri = None
          self._cdn_streaming_uri = None
          self._cdn_ios_uri = None
          self._cdn_log_retention = False
docs: Sets all the CDN-related attributes to default values.