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28 Cards in this Set

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  • Back
  • 3rd side (hint)
Port 20
TCP: File Transfer Protocol (FTP) data port (active mode)

File transfer

Port 21
TCP: File Transfer Protocol (FTP) control port

File transfer

Port 22
TCP: Secure Shell (SSH), including Secure Copy (SCP) and Secure File Transfer Protocol (SFTP)

A secure protocol

Port 23
TCP: Telnet

Old and insecure

Port 25
TCP: Simple Mail Transfer Protocol (SMTP)

Email

Port 49
TCP: Terminal Access Controller Access-Control System+ (TACAS+)

Remote authentication

Port 53
TCP: Domain Name Service (DNS) name queries,

UDP: DNS zone transfers

Common resolution

Port 69
UDP: Trivial File Transfer Protocol (TFTP)

Used for file transfers

Port 80
TCP: Hypertext Transfer Protocol (HTTP)

Reassess your life choices if you need this hint.

Port 88
UDP: Kerberos

Authentication protocol

Port 110
TCP: Post Office Protocol v3 (POP3)

Email

Port 161
UDP: Simple Network Management Protocol (SNMP)

Network management

Port 162
UDP: Simple Network Management Protocol trap (SNMP trap)

Network management

Port 137
UDP: Network Basic Input/Output System (NetBIOS) (uncommonly also TCP 137)

Name resolution

Port 138
UDP: Network Basic Input/Output System (NetBIOS)

Name resolution

Port 139
TCP: Network Basic Input/Output System (NetBIOS)

Name resolution

Port 143
TCP: Internet Message Access Protocol v4 (IMAP4)

Email

Port 389
TCP: Lightweight Directory Access Protocol (LDAP)

Active Directory

Port 443
TCP: Hypertext Transfer Protocol Secure (HTTPS), also Secure Socket Tunneling Protocol (SSTP) for VPNs

A common one and a VPN one

Port 465
TCP: Simple Mail Transfer Protocol (SMTP) with SSL or TLS

Email

Port 500
UDP: IPSec component Internet Key Exchange (IKE) for VPN. Encapsulating Security Protocol (ESP) uses "protocol ID number 50".

VPN

Port 636
TCP: Lightweight Directory Access Protocol (LDAP) via SSL or TLS

Active Directory

Port 993
TCP: Internet Message Access Protocol (IMAP) with SSL or TLS

Email

Port 995
TCP: Post Office Protocol (POP) via SSL or TLS

Email

Port 1422
TCP: Microsoft SQL Server

Database

Port 1701
UDP: Layer 2 Tunneling Protocol (L2TP)

VPN

Port 1723
TCP: Point-to-Point Tunneling Protocol (PPTP)

VPN

Port 3389
TCP and UDP: Remote Desktop Protocol (RDP)

Remote