In computer networking, virtual ports are also known as software application ports, logical ports, or TCP/IP ports. Any TCP/IP application uses a virtual port, identified by a port number.

Virtual ports are used in both TCP and UDP to identify unique end-to-end connections. They are called virtual ports because a single physical connector can serve multiple logical connections.
Playlists:

Ports, port #, & TCP/IP applications

https://www.youtube.com/watch?v=hc1yi_I1W4k&list=PLSNNzog5eydtfuhxfedXD3tRbt7c-Z5Se

Topology & cabling, & physical cabling structure:
https://www.youtube.com/watch?v=T5xQJkAamk&list=PLSNNzog5eydsZCgT6tlX7Zb4EU67_hxyA
Ethernet Basics:
https://www.youtube.com/watch?v=FkH_JIZbpU&list=PLSNNzog5eydvAxPHJiDybPomC1fFHf1KE
IPv4 Basics:
https://www.youtube.com/watch?v=vcArZIAmnYQ&list=PLSNNzog5eydt_plAtt3k_LYuIXrAS4aDZ
OSI Model and related:
https://www.youtube.com/watch?v=nFnLPGk8WjA&list=PLSNNzog5eydtQcezP4OrrLL5preHLLkGA

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