Table to facilitate study sessions.
| Protocol | Port Number | Service |
|---|---|---|
| TCP | 21 | FTP |
| TCP | 22 | SSH |
| TCP | 23 | Telnet |
| TCP | 25 | SMTP |
| UDP | 53 | DNS |
| TCP | 69 | TFTP |
| TCP/UDP | 79 | Finger |
| TCP | 80 | HTTP |
| TCP | 135 | Microsoft RPC Endpoint Mapper |
| UDP | 137 | NetBIOS name service |
| TCP | 139 | NetBIOS session |
| UDP | 161 | SNMP |
| TCP | 179 | BGP |
| TCP/UDP | 389, 3268 | Windows Active Directory LDAP |
| UDP | 500 | IPsec or IKE |
| UDP | 1434 | SQL resolution |
| TCP | 1521, 2483 | Oracle TNS |
| TCP/UDP | 2049 | NFS |