The CCITT Recommendation X.25 specifies three layers of communications:
A. application, presentation and session
B. Session, transport and network
C. physical datalink and network
D. datalink, network and transport
E. None of the above
Answer: Option C
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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