Protocol status code exists generally used to display the layer 2 status of an interface.
Interface status codes can inform you whether an interface on a Cisco router or a switch lives to work. An HTTP status code exists in the server response to a browser's request. When you call a website, your browser sends a request to the site's server, and the server then responds to the browser's request with a three-digit code: the HTTP status code.
The line protocol up status exists when the router receives the keep-alive messages across the interface. Every device connected sends across heart-beat messages or keep-alive messages to demonstrate that they are still available.
The second status code (understood as protocol status) indicates that Layer 2 stands also working (line protocol is up) and is always Down if the line status is Down. Finally, the word at the end of the line demonstrates the working state of the interface (connected in our case).
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