Are apsd, ntpd, mDNSResponder, trustd, netbiosd necessary for macOS functioning? I'm seeing 5 processes with network activity ( sending/receiving bytes ). I'm not sure whether these are normal occurrences?

List of processes


apsd
ntpd
mDNSResponder
trustd
netbiosd


I researched a few of those and some were associated to file sharing via windows or bonjour, however I don't have any other PCs on my network to even begin sharing files with.
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.