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# CS642 - Networks and Data Communication CS642 Fall 2006...

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Networks and Data Communication CS642, Fall 2006 Assignment # 3

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1- Is the data link layer protocol necessary even if there were no bit errors or losses at the physical layer? Why or why not? Yes, it is needed. It provides many services other than handling bit errors. 1- It provides the service interface to the network. 2- It prepares the frames to be sent and received. 3- Control the flow of the frames. 2- Given the frame 10011101, what is the checksum bit assuming odd parity? - Repeat the above question if the even parity is used. Odd parity: checksum bit is 1. Even parity: checksum bit is 0. 3- A generator function for polynomial detection technique is given as X 5 + X 2 + 1. a- What is the generator function in binary form? G(x)= 100101 b- What is the checksum for the following frame in binary and in polynomial forms? 1 0 0 1 0 1 1 0 1 1 1 2
4- Assuming a framing protocol that uses bit stuffing, answer the following questions: a- Show the bit sequence transmitted over the link and mark the stuffed

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