Ports Flashcards
Port 20, 21
File Transfer Protocol FTP.
Transfers computer files between a client and server on a computer network.
Unsecured method.
Data transferred in the clear.
Port 22
Secure Shell, SSH.
Cryptographic network protocol for operating network services securely over an unsecured network.
Best known for remote login to computer systems by users.
Port 22
SSH File Transfer Protocol, SFTP.
Provides file access, file transfer, and file management over any reliable data stream.
Port 23
Telnet.
Provides bidirectional interactive text-oriented communication facility using a virtual terminal connection.
Like SSH, but insecure.
Port 25
Simple Mail Transfer Protocol, SMTP.
Internet standard for sending email.
RFC 821 was defined originally in 1982.
RFC 5321 developed in 2008 (current version).
Port 53
Domain Name Service, DNS.
Hierarchical decentralized naming system for computers, services, or other resources connected to the internet or a private network.
Converts domain names to IP addresses.
Port 67, 68
Dynamic Host Control, DHCP.
DHCP server dynamically assigns an IP addresses and networking parameters automatically.
Reduces burden on network admin.
Port 69
Trivial File Transfer, TFTP.
Transmits files in both directions of a client-server application.
Used for booting an OS from a local area network file server.
Doesn’t provide user authentication or directory visibility.
Essentially a stripped-down version of FTP.
Port 80
HyperText Transfer, HTTP.
Foundation of data communication for WWW.
Designed for distribution, collaborative, and hypermedia presentation across many devices.
Port 110
Post Office Protocol v3, POP3.
Used by local email clients to retrieve email from a remote server over TCP/IP connection.
Port 123
Network Time Protocol.
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.
Port 139
NetBios.
Network Basic input/output system.
Provides services allowing applications on separate computers to communicate over a local area network for file and printer sharing.
Port 143
Internet Message Access Protocol, IMAP.
Provides email clients to retrieve email messages from a mail server over a TCP/IP connection.
Port 161
Simple Network Management, SNMP.
Provides collection and organization of info about managed devices on IP networks.
Can modify that info to change device behavior, commonly used in network devices.
Port 389
Lightweight Directory Access, LDAP.
Open, vendor-neutral, industry standard for accessing and maintaining distributed directory info services.
Port 443
HTTP Secure, HTTPS.
Foundation of e-commerce on WWW.
Designed for adding security to the insecure HTTP protocol.
Port 445
Server Message Block, SMB.
Provides shared access to files, printers, and misc. communications between devices on a network.
Port 514
System Logging Protocol, Syslog.
Used to send logging data back to a centralized server.
Port 587
Simple Mail Transfer Protocol Transport Layer Security, SMTP TLS.
Secure and encrypted way to send emails.
Port 636
LDAP Secure, LDAPS.
Open, vendor-neutral, industry standard for accessing and maintaining distributed directory information services.
Provides secure directory services
Port 993
Internet Message Access Protocol over SSL, IMAP over SSL.
Secure and encrypted way to receive emails.
Port 995
Post Office Protocol v3 over SSL, POP3 over SSL.
Secure and encrypted way to receive emails.
Port 1433
Structured Query Language Server Protocol, SQL.
Used for communication from a client to the database engine.
Port 1521
SQLnet Protocol.
Used for communication from a client to the database engine.
Port 3306
MySQL.
Used for communication from a client to the MySQL database engine.
Port 3389
Remote Desktop Protocol, RDP.
Proprietary protocol developed by MS.
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.
Port 5060, 5061
Session Initiation Protocol, SIP.
Provides signaling and controlling multimedia communication sessions in applications.
Used for internet telephony for voice and video calls, VOIP, and instant messaging.
