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?

IPSec
VPN
xDSL
Cable
HDLC

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Computer Networking
A T-switch is used to

transmit characters one at a time
control how messages are passed between computers
rearrange the connections between computing equipment
None of these
echo every character that is received

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