Computer Science

1. (TCO 6) Show the subnet address, subnet mask in slash notation, broadcast address, number of addresses, first valid host address, and the last valid host address for the subnet address of the host with IP v4 address: 102.183.7.15 255.240.0.0 (Points : 15)

Question 2. 2. (TCO6) An IPv4 header bytes in Hex notation is given below: 45 00 05 dc fd 2b 20 00 80 11 95 ca c0 a8 00 64 c0 a8 00 66. Answer the following questions about the header: Are options being used? What type of higher-level protocol is this datagram carrying? Is there a fragmentation? If yes, is this a first, last, or middle fragment? What are source and destination IP addresses for the IPv4 header? (Points : 15)

Question 3. 3. (TCO 7) A host with an IP address 125.11.78.10 and a MAC address AA:BB:A2:4F:67:CD has received an ARP request from a router with IPv4 address 125.45.23.12 and the MAC address 23:45:AB:4F:67:CD. Show the ARP reply packet entries the host sends to the router. (Points : 15)

Question 4. 4. (TCO 7) A client sends 1024 bytes of data to a server using TCP protocol. Calculate the efficiency of this transmission at the TCP level (ratio of data excluding header to the total bytes transmitted). Calculate the efficiency of transmission at the IP level. Assume no options for the header and no errors. Calculate the efficiency of transmission at the data link layer. Assume no options for IP header and Ethernet-II format are used at the data link layer. (Points : 15)

Question 5. 5. (TCO2) Consider an analog signal, which can range from –4V to +4V. The input signal is sampled at 20000 samples per second. The sample values are quantized using 16 equally spaced steps. At what data rate is the resulting signal sent? If 32 equally spaced steps are used instead of 16, what improvement do you expect in Signal to Noise ratio due to quantization? (Points : 15)

Question 6. 6. (TCO 4) A system uses the Go-back-N ARQ protocol with a window size of 7. If each packet carries 1000 bits of data, how long does it take to send 1 million bits of data if the distance between the sender and receiver is 5000 Km and the propagation speed of the signal is 2×10^8 meters per second? Ignore transmission, waiting, and processing delays. Assume no errors in the link. (Points : 15)

Question 7. 7. (TCO 2) You are given three channels A, B, and C with Bit Error Rates 10-6 , 10-5 , and 10-9 respectively. Which channel is best? And what is the number of errors that you will likely see on that channel when you transmit a one mega-bit file? (Points : 15)

Question 8. 8. (TCO 3) What is the checksum for the data (in Hex): 3456ABCC02BCEEEE? (Points : 15)

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