Computer Networking
In OSI model, which of the following layer transforms information from machine format into that understandable by user

presentation
None of these
physical
application
session

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Computer Networking
X.21 is

None of these
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO
a method of determining which device has access to the transmission medium at any time

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