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Which of the following statement is incorrect?
The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
The second layer of communication is the data-link layer
Errors in the physical layer can be detected by the data link layer
The fourth layer, in reference to the OSI model, is the session layer
None of the above
Correct Answer:
The fourth layer, in reference to the OSI model, is the session layer
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