Computer Networking
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?

VPN
xDSL
Cable
IPSec
HDLC

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Computer Networking
Demodulation is a process of

converting analog to digital signals
converting digital to analog signals
multiplexing various signals into one high speed line signals
performing data description.

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