Port Numbers Flashcards
Secure Shell (SSH)
tcp/22
Encrypted communication link.
Login to devices remotely.
Console access.
Domain Name System (DNS)
udp/53.
Converts names to IP addresses.
Very critical resources
Simple Mail Transfer Protocol (SMTP)
tcp/25.
Server to server email transfer.
Used to send mail from a device to a mail server.
Commonly configured on mobile devices and email clients.
Secure File Transfer Protocol (SFTP)
tcp/22
Secure File transfer.
Uses SSH port
File Transfer Protocol (FTP)
tcp/20 (active mode data)
tcp/21 (control)
Transfer files between systems
Authenticates with a username and password
Trivial File Transfer Protocol (TFTP)
udp/69
Simple form of file transfer.
No authentication.
Reads and writes files.
Dynamic Host Configuration Protocol (DHCP)
udp/67, udp/68
Automated configuration of IP addresses, subnet mask, and other options.
Requires a DHCP server.
Hypertext Transfer Protocol (HTTP)
tcp/80
Unencrypted web server communication
Hypertext Transfer Protocol Secure (HTTPS)
tcp/443
Secured web server communication
Remote Desktop Protocol (RDP)
tcp/3389
Remote access from a remote location.
Many Windows operating systems have this service included.
Network Time Protocol (NTP)
udp/123
Synchronizes clocks which is important for log files, authentication, outage details, etc.
Session Initiation Protocol (SIP)
tcp/5060, tcp/5061
VoIP signaling.
Setup and manage VoIP sessions.
Simple Message Block (SMB)
tcp/445
Protocol used by Windows to transfer files or share printers between Windows devices.
Post Office Protocol v3 (POP3)
tcp/110
Receive emails from an email server.
Basic mail transfer functionality.
Internet Message Access Protocol v4 (IMAP4)
tcp/143
Manage email inbox from multiple clients.
Receive emails from an email server.
