If you want to add extra security to your network, Netgear Armor relies on Bitdefender to monitor your network and devices for malicious activity. Once it detects a bad actor, it can notify the network and all the devices thereon in seconds. This prevents the problem from propagating while the security software does its work. It costs $99 for an annual subscription, but you get a free year with select routers if you buy directly from the Netgear site.