The Telnet protocol provides remote login service. Most academic computers at Temple University are connected to the Internet. The Ethernets on each floor in a building are connected together by an IP router that might be located in the basement of the building. Binary counting system. Two symbols - 0 and 1.
Computers use the binary system because it simplifies hardware.
Used by people but translated to IP address before communication takes place. 32 bits represented as 4 decimal numbers between 0 to 255. 48 bits represented as 12 hexadecimal bytes. Packets and Protocols - Envelopes inside of envelopes. Shirley would send an FTP packet inside a TCP packet inside an IP packet inside an Ethernet packet to our router, prepnet.temple.edu.