S.no Internal DOS Command External DOS Command
1. These commands are contained in files of MS-DOS. These commands are not in-built in MS-DOS.
2. Functions of internal DOS commands are built into the command interpreter Functions which are not included in the interpreter
3. Requires any external file in the computer to read internal DOS command. Requires an internal file in the computer to read external DOS commands.
BY Best Interview Question ON 28 Mar 2019

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