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
All of these
POP3
FTP
MAP

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Linux
The physical layer of a network

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

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