Telnet is an application layer protocol.
Official documents and user-friendly guides are both welcome. 
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                                    The description of Telnet that became standardized as Internet Standard STD 8 by the Internet Engineering Task Force.
                                    
                                  
                                
            
                                    The RFC which forms the second part of STD 8.
                                    
                                  
                                
            
                                    The description of Telnet that became standardized as Internet Standard STD 8 by the Internet Engineering Task Force.
                                    
                                  
                                
            
                                    The RFC which forms the second part of STD 8.
                                    
                                  
                                