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MCQ

How many OSI layers are covered in the X.25 standard?

two

three

seven

six

None of the above

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Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

one bit or any odd number of bits inverted in a block of data during transmission

two bits or any even number of bits inverted in a block during transmission

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two bits or any even number of bits inverted in a byte during transmission

None of the above

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Which of the following layer protocols are responsible for user and the application programme support such as passwords, resource sharing, file transfer and network management?

Layer 7 protocols

Layer 6 protocols

Layer 5 protocols

Layer 4 protocols

None of the above

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History and Generations

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