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The nic is a network adaptor modem is a device to communicate with a remote
What is the difference between a data card and an usb modem?
A USB modem plugs into your USB port.A "normal" modem plugs into your RS232 port or your parallel port.
Nothing. They are both modems (MOdulator/DEModulator).
Port speed is how fast the computer talks to the modem. Modem speed is how fast the modem talks across the phone line to the other modem.
a wireless router is needed when internet modem doesn't have wireless capability.
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yes
An internal modem is housed within the main computer. An external modem is on the outside of the computer and connected to the computer with a cable.
There is a difference if you are using a low quality router. For good routers you will not notice any difference. Usually there is no difference at all.
The bandwidth of a DSL modem varies depending on physical distance from the main center, while a cable modem is a static speed in all areas. For this reason, distance determines the greater bandwidth size.
The cable modem that you got from your service provider is adequate. You might get a little faster service with another modem but it will probably not make much of a difference.