Ports Flashcards
(25 cards)
PORT 20/21
TCP
FTP = File Transfer Protocol
20 = Data / 21 = Authorization
Port 22
TCP
SSH
Encrypted CLI to remote SCP/SFTP
Port 23
TCP
TELNET
Plaintext to CLI (not secure)
Port 25
TCP
SMTP
“Send Mail to People” outgoing mail - not secure
Port 49
TCP & UDP
TACACS
AAA for NAC
AAA
Authenticate
Authorize
Audit (Account)
NAC
Network Access Control
Port 53
UDP
DNS
Zone Transfer
Port 69
UDP
TFTP
Trivial FTP = small files/not secure
Port 80
TCP
HTTP
Not secure/regular internet
Port 88
UDP or TCP
Kerberos
Single Sign On (SSO)
Port 110
TCP
Pop3
Incoming Email/Not Secure
Port 123
UDP
NTP
Network Time Protocol
Port 137-139, 445
UDP or TCP
SMB - Server Message Block (NetBIOS)
Port 143
TCP
IMAP
Incoming EMail, Plain text,
Port 161-162
UDP
SNMP - Simple Network Management Protocol v1, 2, 3 - always 3
Port 389
UDP or TCP
LDAP - lightweight data access control - not secure
Port 443
TCP
HTTPS - internet secure
secure via SSL/TLS
Port 587
TCP
SMTPS - Secure SMTP Outgoing Mail
secure using SSL/TLS
Port 636
TCP
LDAPS - LDAP secure
secure using SSL/TLS
Port 993
TCP
IMAPS - Secure IMAP
Incoming Email
Secure via SSL/TLS
Port 995
TCP
PoP3S - Pop3 secure
incoming email secure
Port 1812
UDP
RADIUS - AAA Authenticate, Authorize
Port 1813
UDP
RADIUS AAA - Accounting/Auditing
