Ports and Protocols Flashcards
FTP
20/21 TCP
File Transfer Protocol - a standard communication protocol used for the transfer of computer files from a server to a client on a computer network.
SSH/SFTP
22 TCP
Secure Shell/Secure FTP - a cryptographic network protocol for operating network services securely over an unsecured network.
SFTP uses SSH
Telnet
23 TCP
Telnet is an unsecured computer protocol that provides two-way interactive communication compatibility for computers on the internet and local area networks. It has a CLI.
SMTP
25 TCP
Simple Mail Transfer Protocol - Mail servers and other message transfer agents use SMTP to send and receive mail messages
DNS
53 TCP/UDP
Domain Name System - translates domain names to IP addresses so browsers can load Internet resources. It also translates internal IP address to common names.
DHCP
67/68 UDP
Dynamic Host Configuration Protocol - a network management protocol used on Internet Protocol networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a client–server architecture.
TFTP
69 UDP
Trivial File Transfer Protocol - a simple lockstep File Transfer Protocol which allows a client to get a file from or put a file onto a remote host.
HTTP
80 TCP
Hypertext Transfer Protocol
POP3
110 TCP
Post Office Protocol version 3 - an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. Once the email has been downloaded it is deleted from the mail server.
IMAP
143 TCP
Internet Messaging Access Protocol - an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. Email is kept on the server after being downloaded which is how it’s differentiated from POP3.
SNMP
161 UDP
Simple Network Management Protocol - an Internet Standard protocol for collecting and organizing information about managed devices on IP networks.
LDAP
389 TCP
Lightweight Directory Access Protocol - an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol network.
SLP
Port 427 TCP
Service Location Protocol - a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration.
HTTPS
443 TCP
Hypertext Transfer Protocol Secure - the communication protocol is encrypted using Transport Layer Security
SMB
445 TCP
Server Message Block - a client-server communication protocol used for sharing access to files, printers, serial ports and other resources on a network.
SMTPS
587 TCP
Simple Mail Transfer Protocol Secure - a method for securing the SMTP using transport layer security.
LDAPS
636 TCP
Lightweight Directory Access Protocol Secure
IMAP Secure
993 TCP
Internet Messaging Access Protocol Secure
POP3 Secure
995 TCP
Post Office Protocol version 3 Secure
RDP
3389 TCP
Remote Desktop Protocol
