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FTP File Transfer Protocol (TCP)
SSH Remote admin (TCP/UDP)
SCP Secure copy (TCP/UDP)
SFTP TCP/UDP - Secure FTP
Telnet TCP/UDP - Remote admin (insecure)
SMTP Unencrypted Simple Mail Transfer Protocol (TCP)
DNS Domain Name Service (TCP/UDP)
TFTP Trivial File Transfer Protocol (UDP)
HTTP Web browsing, insecure (TCP)
Kerberos Windows network authentication (TCP/UDP)
POP3 Unencrypted (TCP)
NNTP Newsnet (TCP)
RPC To locate DCOM ports (TCP/UDP)
NetBIOS Name querying and and sending of data (TCP/UDP)
IMAP Unencrypted mail (TCP)
SNMP Remote monitoring (UDP)
SNMPTRAP Send trap and inform requests (TCP/UDP)
LDAP Unencrypted Lightweight Directiory Access Protocol (TCP/UDP)
HTTPS Encrypted browsing (TCP)
SMB Server Message Block, access to files over a network (TCP)
SMTP SSL/TLS Encrypted version of SMTP (TCP)
Syslog Conduct message logging (UDP)
LDAP SSL/TLS Encrypted LDAP (TCP/UDP)
iSCSI Connects to storage over IP (TCP)
FTPS Encrypted FTP (TCP)
IMAP SSL/TLS Encypted IMAP (TCP)
POP3 SSL/TLS Encrypted POP3 (TCP)
Microsoft SQL (TCP)
RADIUS (low number alternative) Remote Access Dial-In User Service low number alternative to 1812/1813 (UDP)
L2TP Layer 2 Tunnel Protocol - requires IPSEC to make it secure (UDP)
PPTP Point to point tunneling protocol - all in one VPN security (1723)
RADIUS (upper number default) Defaut RADIUS ports (not 1645-1646) (UDP)
FCIP Fibre channel frame - SANs
iSCSI Target
RDP Remote Desktop Protocol (TCP/UDP)
Diameter Radius AAA replacement (TCP)
Syslog over TLS (TCP)
How many ports are there?
What's the highest port number? Remember that port '0' is a port...
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