mDNS

mDNS lets devices on a local network discover each other by name without a central DNS server, powering features like AirPrint and Chromecast discovery. Like LLMNR, it trusts whoever answers first, so attackers on the same network can spoof responses to poison name resolution and capture credentials. It can also leak device names and services, and misconfigured mDNS responders exposed to the internet have been abused for DDoS amplification.