Although dial-up technologies are not very common in modern networks, this is still a valid topic for CCDA certification. Dial-up falls under the category of circuit switching and it utilizes PSTN. A connection is established when the user wants to use the dial-up option and the connection ends when the user is done using the link.
Considering dial-up connections use an analog signal, users need to use a modem (modulator demodulator) in order to take the digital signal from the computer and convert it into analog communication on the PSTN, and vice versa.
Dial-up access . . .
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