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4 1S%o 20 Y } MANIPAL UNIVERSITY JAIPUR SCHOOL OF COMPUTING AND IT = B.Tech. V" Semester Second Sessional Examination- 2017-18 ee Branch; CSE / IT (CCE e IT1504-Data Communications | (OPEN BOOK) | Duration: 1 hour Max. Marks: 15 Instructions: e All questions are compulsory. « Missing data if any may be assumed suitably. ¢ Calculator is allowed. ¢ 2 Text books and one bounded reference notes (Xerox class notes allowed ) - te Given the dataword 1010011110 and the divisor 10111, write the polynomial 3] representation for boffi data word and divisor, show’the generation of CRC code word at the sender site (perform the CRC division by polynomial) also perform the CRC division by polynomial at receiver site too. (Assume that codeword is not corrupted during the transmission) hence show that syndrome is zero. af The following Hamming coded (single bit correction) string was received: 010101010] 1L Is there an error? If yes, in which position? 4 ~ esuad om [2] pu ea Q2 Two peer processes A (Sender) and B (Receiver) use stop and wait ARQ to send wise packets over a single link with capacity C. All packets have the same length of 100 bits. The round trip time (which is the time until A receives an acknowledgement =e | ~ for a sent packet) is equal to 2 seconds. Assume that no packets or ACK’s are | dropped and that all packets and ACK‘s arrive error-free. Furthermore, assume that By 1 the capacity C is equal to 100,000 bits per second. (a) Find the average (transmission) rate (in bits per seconds) with which process | A sends data to process B? (b) What is the Link Utilization? Q.3 (ay The timer of a system using the Stop-and-Wait ARQ Protocol has a time-out of [2] : 4ms. Draw the flow diagram for four frames if the round trip delay is 6ms. Assume no data frame or control frame is Tost or damaged. oy Suppose receiver receives the following frame :(D is Data Byte, Eis Escape Byte [2] and F is Flag Byte) FDEEDEFDDDEEEEDF What was the original frame? If 4 bit sequence number is used in Selective Repeat ARQ and the sequence [3] wy number starting with zero. Find the sequence number in the sender window for 63% frame. g | 
