Toggle Keys - Caps Lock, Num Lock,
Modifier Keys - Shift, Alt, Ctrl, Fn
Semi conductor memory - RAM, ROM, EPROM, flash memory.
Magnetic memory - hard disk, floppy disk, magnetic tapes.
Optical memory - computer disk, DVD, blue-ray disk.
IPv 4 - 32 bits numeric address
IPv 6 - 128 bits hexadecimal address
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