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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def nname(cls, map_name, network_name):
 """ Generates a network name that should be used for creating new networks and checking the status of existing networks on the client. In this implementation, the format will be ``<map name>.<network name>``. :param map_name: Container map name. :type map_name: unicode | str :param network_name: Network configuration name. :type network_name: unicode | str :return: Network name. :rtype: unicode | str """

        if network_name in DEFAULT_PRESET_NETWORKS:
            return network_name
        return '{0}.{1}'.format(map_name, network_name)