CompTIA Network+: Registered Ports

“With a range from 0 to 65535 split across three groups (those reserved for TCP/IP applications registered ports and dynamic ports) differentiating port numbers can be confusing. In this course you ll learn how to identify and use the most common registered ports
You ll examine port 1433 reserved for Structured Query Language (SQL) Server and when to use SQLnet port 1521 Remote Desktop Protocol (RDP) port 3306 and port 5060/5061 reserved for the Session Initiation Protocol (SIP).
You ll then outline how IP protocols are used to facilitate Internet Protocol (IP) communication such as Transmission Control Protocol (TCP) User Datagram Protocol (UDP) Internet Control Message Protocol (ICMP) and Gateway Routing Encapsulation (GRE).
Lastly you ll examine connectionless and connection-oriented services two data transmission services used to establish and terminate connections exploring how they behave at the network and transport layers of the OSI model.”