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.
