Common Ports Flashcards
Telnet
Terminal Emulation
- TCP / 23
- Not secure
SSH
Secure Shell
- TCP / 22
DNS
Domain Name System
- UDP / 53
- Resolves host names to IP addresses
SMTP
Simple Mail Transfer Protocol
- TCP / 25
- Server to server email transfer
- Used to send mail from a device to email server
FTP
File Transfer Protocol
- TCP / 20 (active mode data)- 2nd connection
- TCP/21 (control) - 1st connection
- Authenticates with a username and password
DHCP
Dynamic Host Configuration Protocol
- UDP/67, UDP/68
- Requires a DHCP server
HTTP
TCP/80
- web server communication
SNMP
Simple Network Management Protocol - UDP/161, 162 V 1 - the original V2 - includes bulk transfers V3 - a secure standard and includes message integrity, authentication and encryption
RDP
Remote Desktop Protocol
- TCP/3389
CIFS/SMB
Common Internet File System/Server Message Block
- TCP/445
Used by Microsoft Windows
Direct SMB communication over TCP without the NetBIOS transport
- provides shared access to files, printers, and serial ports between nodes on a network
POP
POP3 - Post Office Protocol v3
- TCP/110
- receive emails from an email server
LDAP/LDAPS
LDAP (lightweight directory access protocol)
- TCP/389
- store and retrieve information in a network directory
LDAPS (LDAP secure)
- TCP/636
- a non-standard implementation of LDAP over SSL
NetBIOS / NetBT
Network Basic I/O System
- 137-139
- Called NetBT when running over TCP/IP
- Naming service, Datagram distribution, Session management
SLP
Service Location Protocol
- 427
- Non proprietary, helps locate resources on the network
AFP
Apple Filling Protocol
- 548
- Default Mac OS file transfer protocol until Apple changed to SMB2 in 2013
