Apple - Are Apsd, Ntpd, MDNSResponder, Trustd, Netbiosd Necessary For MacOS Functioning?
Answer : apsd - Used for FaceTime push notifications ntpd - Used to synchronize clock mDNSResponder - Part of the Bonjour protocol, used to scan your network for other Bonjour-enabled devices (printers, computers, etc...) trustd - Used for validating SSL certificates netbiosd - Used when interacting with Microsoft shared drives This is all normal activity. However, if you are worried about security, you can disable the services you don't plan on using. Edit: You might not want to disable ntpd and trustd as they are necessary for basic functionality such as browsing websites.