Which of the following statement is incorrect?
A. The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
B. The second layer of communication is the data-link layer
C. Errors in the physical layer can be detected by the data link layer
D. The fourth layer, in reference to the OSI model, is the session layer
E. None of the above
Answer: Option D
This Question Belongs to Networking >> Networking Miscellaneous
A. Agreements on how communication components and DTE
B. Logical communication channels used for transferri
C. Physical communication channels used for transferr
D. None of the above
A. Simplex
B. Four wire circuit
C. Full Duplex
D. Half Duplex
Error detection at the data link level is achieved by
A. Bit Stuffing
B. Cyclic Redundancy Code
C. Hamming Code
D. Equalization
Which of the following is a wrong example of network layer?
A. Internet Protocol (IP) - ARPANET
B. X.25 Packet Level Protocol (PLP)-ISO
C. Source routing and domain naming-USENet
D. X.25 level 2-ISO
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