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What is the number of separate protocol layers at the serial...

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Networking Miscellaneous
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What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

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Correct Answer: Option D
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1 Comment
Najmush Shakib
Najmush Shakib 7 years ago
X.25 standards are:

A) RS-232.
B) RS-422.
C) RS-485.
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