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

presentation
physical
session
application
None of these

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Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

No cable is attached.
The keepalives are different times.
The administrator has the interface shut down.
The administrator is pinging from the interface.

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