problem 1: Distinguish between the bit oriented protocols and character oriented protocols.

problem 2: Describe the BSC frame formats.

problem 3: Name the three kinds of frames which HDLC holds?

problem 4: Describe the function of various fields of the HDLC frame.

problem 5: Describe bit stuffing in the HDLC.

problem 6: How many layers X.25 protocol encompasses and how are these are related to the OSI model?

problem 7: describe the function of each layer of the X.25.

problem 8: Name the two kinds of virtual circuits and distinguish between them.

problem 9: Describe different kinds of X.25 packet formats.

problem 10: How does X.25 handle flow and error control? Describe.