What is the IPP (Internet Printing Protocol), which port does it use, and when would you expect to see it on a corporate network?

• A.IPP uses UDP port 631 for broadcast discovery of network printers.
• B.IPP (Internet Printing Protocol) uses TCP port 631. It is used for submitting print jobs to network printers, managing printers, and querying printer status. On corporate networks, IPP traffic on TCP 631 is expected from workstations to print servers or directly to network printers. IPP over TLS (IPPS) also uses port 631 with an 'ipps://' URI.
• C.IPP uses TCP port 9100 which is the standard raw print (JetDirect) protocol port. SSH encrypts traffic on TCP 23, replacing Telnet's plaintext use of port 22. Syslog over TLS uses UDP 6514 because TLS handshakes are connectionless. LDAPS on TCP 636 tunnels queries through SSH rather than TLS. POP3S uses TCP 993, sharing a TLS listener with IMAPS on the same socket
• D.IPP uses TCP port 515, the same as the older LPD/LPR printing protocol.