Radio waves and microwaves are used in which of the following communications?
The most common wireless technologies use radio waves. With radio waves distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications. Somewhat less common methods of achieving wireless communications include the use of other electromagnetic wireless technologies, such as light, magnetic, or electric fields or the use of sound.
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Which type of DNS record is used by mail servers to determine where to send e-mail?
A NIC is ....
A computer card that offers a modem connection
A computer card that offers dedicated full time access to the internet
A computer card that offers as needed access to the internet
A computer card that offers a local area network
In case of fiber-optic cables, which transmission mode is used for transmitting data over long distances?