CompTIA Network+: Well-known Ports & Protocols

In terms of computer networks protocols are used to provide a required set of rules that enable computers to exchange information. Well-known Internet protocols include Transmission Control Protocol/Internet Protocol User Datagram Protocol/Internet Protocol File Transfer Protocol and Hypertext Transfer Protocol. Ports by comparison are used to identify a type of network or specific process. Port numbers ranging from 0 to 65535 are typically divided into three categories – well-known ports dynamic ports and registered ports. In this course you’ll learn about the most commonly-known ports in use on a computer network today. These include File Transfer Protocol Simple Mail Transfer Protocol Domain Name System and Hypertext Transfer Protocol. You;ll examine how HTTP uses the reserved port 80 and enables computers to send and receive Web client-based communication and messages from a Web server including web site pages and data. Next you;ll explore other key ports including port 25 reserved for Simple Mail Transfer Protocol and how SMTP allows e-mail clients and services to send out e-mails. You;ll learn how port 100 reserved for Post Office Protocol v3 and port 143 reserved for Internet Message Access Protocol allow for e-mail clients to retrieve e-mail messages from a mail server over a TCP/IP connection. Lastly you;ll learn about Secure Sockets Layer and how it can be incorporated into POP3 and IMAP implementations to enable more secure encrypted e-mail communications