Linux
The physical layer of a network

None of these
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
controls error detection and correction

ANSWER DOWNLOAD EXAMIANS APP

Linux
NIS

is Network Information Service
allows configuration-such as password and group files
was formerly known as yellow pages
is a simple directory service whose main purpose is to allow remote authentication of systems on local network systems

ANSWER DOWNLOAD EXAMIANS APP