- udp
- port 69
- no terminal communication
- insecure
- used for BOOTP & PXE
- TCP
- control port 21 / active data port 20 / passive data RHN
- insecure
- active and passive
- Tcp
- port 22
- Adds FTP like services to SSH
- TCP
- port 443
- SSL/TLS sncryption to FTP
- TCP
- port 22
- non Interactive