Ports Flashcards
20, 21
File Transfer Protocol FTP
▪ Transfers computer files between a client and server on a computer network
▪ Unsecure method
▪ Data transferred in the clear
22
Secure Shell SSH (Port 22)
▪ Cryptographic network protocol for operating network services securely over an unsecured network
▪ Best known for remote login to computer systems by users
SSH File Transfer Protocol SFTP (Port 22)
▪ Provides file access, file transfer, and file management over any reliable data stream
23
Telnet (Port 23)
▪ Provides bidirectional interactive text-oriented communication facility using a virtual terminal connection
▪ Like SSH, but insecure
25
Simple Mail Transfer Protocol SMTP (Port 25)
▪ Internet standard for sending electronic mail
▪ RFC 821 was defined originally in 1982
▪ RFC 5321 developed in 2008 (current version)
53
Domain Name Service DNS (Port 53)
▪ Hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network
▪ Converts domain names to IP addresses
69
Trivial File Transfer TFTP (Port 69)
▪ Transmits files in both directions of a client-server application
▪ Used for booting an operating system from a local area network file server
▪ Doesn’t provide user authentication or directory visibility
▪ Essentially a stripped-down version of FTP
80
Hyper Text Transfer HTTP (Port 80)
▪ Foundation of data communication for WWW
▪ Designed for distributed, collaborative, and hypermedia presentation across many devices
110
Post Office Protocol v3 POP3 (Port 110)
▪ Used by local e-mail clients to retrieve e-mail from a remote server over
TCP/IP connection
123
Network Time Protocol NTP (Port 123)
▪ Provides clock synchronization between computer systems over packet- switched, variable-latency data networks
▪ Created in 1985, one of the oldest Internet protocols in current use
139
NetBIOS (Port 139)
▪ Network Basic Input/Output System
▪ Provides services allowing applications on separate computers to communicate over a local area network for file and printer sharing
143
Internet Mail Application IMAP (Port 143)
▪ Provides e-mail clients to retrieve e-mail messages from a mail server over a TCP/IP connection
▪ Allows the end user to view and manipulate the messages as if they’re stored locally
389
Lightweight Directory Access LDAP (Port 389)
▪ Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
▪ LDAP and Active Directory use this port
443
HTTP Secure HTTPS (Port 443)
▪ Foundation of ecommerce on WWW
▪ Designed for adding security to the insecure HTTP protocol
445
Server Message Block SMB (Port 445)
▪ Provides shared access to files, printers, and miscellaneous communications between devices on a network
514
System Logging Protocol Syslog (Port 514)
▪ Used to send logging data back to a centralized server
587
Simple Mail Transfer Protocol Transport Layer Security SMTP TLS (Port 587)
▪ Secure and encrypted way to send emails
636
LDAP Secure LDAPS (Port 636)
▪ Open, vendor-neutral, industry standard for accessing and maintaining distributed directory information services Provides secure directory services
993
Internet Message Access Protocol over SSL IMAP over SSL (Port 993)
▪ Secure and encrypted way to receive emails
995
Post Office Protocol Version 3 over SSL POP3 over SSL (Port 995)
▪ Secure and encrypted way to receive emails
1433
Structured Query Language Server Protocol SQL (Port 1433)
▪ Used for communication from a client to the database engine
1521
SQLnet Protocol (Port 1521)
▪ Used for communication from a client to an Oracle database
3306
MySQL (Port 3306)
▪ Used for communication from a client to the MySQL database engine
3389
Remote Desktop Protocol RDP (Port 3389)
▪ Proprietary protocol developed by Microsoft
▪ Provides a user with a graphical interface to connect to another computer over a network connection
▪ User employs RDP client software for this purpose and the other computer must run RDP server software
161, 162
Simple Network Management SNMP (Port 161)
▪ Provides collection and organization of information about managed devices on IP networks
▪ Can modify that information to change device behavior, commonly used in network devices
