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.