Linux
What protocol(s) is(are) allowed a user to retrieve her/his mail from the mail server to her/his mail reader?

None of these
MAP
FTP
POP3
All of these

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Linux
The physical layer of a network

defines the electrical characteristics of signals passed between the computer and communication devices
None of these
constructs packets of data and sends them across the network
All of these
controls error detection and correction

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