All computers on a network require a hardware device called a network adapter. The easiest and fastest network adapters to install are external; that is, they connect to a computer via the USB port(USB port is an external bus that supports Plug and Play installation. Using USB, you can connect and disconnect devices without shutting down or restarting your computer. You can use a single USB port to connect up to 127 peripheral devices, including speakers, telephones, CD-ROM drives, joysticks, tape drives, keyboards, scanners, and cameras. A USB port is usually located on the back of your computer near the serial port or parallel port.)on the outside of the machine.
Internal network adapters must be installed inside the computer, requiring you to open or remove the computer housing. It is recommended that a qualified technician install an internal network adapter.
What is a Network adapter- Explained
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