TCP (Transmission Control Protocol)
UDP (User Datagram Protocol)
FTP (File Transfer Protocol)
SFTP (Secure File Transfer Protocol)
TFTP (Trivial File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
HTTP (Hypertext Transfer Protocol)
HTTPS (Hypertext Transfer Protocol Secure)
POP3/IMAP4 (Post Office Protocol, version 3/Internet Message Access Protocol,
version 4)
Telnet
SSH (Secure Shell)
ICMP (Internet Control Message Protocol)
ARP/RARP (Address Resolution Protocol/Reverse Address Resolution Protocol)
NTP (Network Time Protocol)
NNTP (Network News Transport Protocol)
SCP (Secure Copy Protocol)
LDAP (Lightweight Directory Access Protocol)
IGMP (Internet Group Multicast Protocol)
LPR (Line Printer Remote)
