def METHOD_NAME():
    """Load network timezones from db into dict network_dict (global dict)."""
    try:
        cache_db_con = db.DBConnection('cache.db')
        sql_result = cache_db_con.select('SELECT network_name, timezone FROM network_timezones;')
        if not sql_result:
            update_network_dict()
            sql_result = cache_db_con.select('SELECT network_name, timezone FROM network_timezones;')
        d = {
            row['network_name']: row['timezone']
            for row in sql_result
        }
    except Exception:
        d = {}
    # pylint: disable=global-statement
    global network_dict
    network_dict = d