import ipaddress


def cidr_to_ip_netmask_tuple(cidr_network):
    """
    Convert CIDR-format IP network string (e.g. 10.0.0.1/24) to a tuple
    (ip, netmask) where netmask is in the form (n.n.n.n).

    Args:
        cidr_network (str): IPv4 network in CIDR notation

    Returns:
        (str, str): 2-tuple of IP address and netmask
    """
    network = ipaddress.ip_network(cidr_network)
    return '{}'.format(network.network_address), '{}'.format(network.netmask)