User data is interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over the Transmission Control Protocol (TCP). Telnet was developed in 1969 beginning with RFC 15, extended in RFC 854, and standardized as Internet Engineering Task Force (IETF) Internet Standard STD 8, one of the first Internet standards.
I think the main reason telnet client was disabled by default in Windows 7 maybe because of its security issue since telnet protocol was built in 1969 (more than 40 years).
The step by step to Enable Telnet on Windows 7:
1. Open the control panel, or you can go to Run and type control.2. Click the "Programs and Features".
3. After that the window will shows the program lists, click on the left side "Turn Windows features on or off". You also can go to this step directly by typing appwiz.cpl on Run or type it on search box(start menu).
4. A new window "Windows Features" will pop out. Find and check the "Telnet Client" option.
5. To activate telnet client through command prompt:
pkgmgr /iu:"TelnetClient"6. To deactivate telnet client through command prompt:
pkgmgr /up:"TelnetClient"If you get an error: operation failed with 0×80070057 The parameter is incorrect, try this one:
start /w pkgmgr /uu:TelnetClient
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