OSI Model - TCP/IP Protocol Suite - Transport Layer Services - Computer Science Assignment Help

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Assignment 1 1. List the layers of the OSI model and the TCP/IP protocol suite (the Internet Model) 2. How do the layers of the OSI correlate to the layers of the TCP/IP protocol suite? 3. Which layers of the TCP/IP protocol suite are the network support layers and which layers are the user support layers? 4. What is data encapsulation (with respect to Questions 1-3)? 5. What are the responsibilities of the Data Link layer? 6. What is the difference between Network layer and Transport layer delivery? 7. If the Data link layer can detect errors between hops, why do you think we need another mechanism at the Transport layer? 8. What are the responsibilities of the Network layer? 9. What are the responsibilities of the Transport layer? 10. What is the difference between a port address, a logical address and a physical address? 11. Name some services provided by the Application layer 12. What are the advantages of combining Session, Presentation and Application layers of the OSI model to a single layer in the        TCP/IP protocol suite? 13. What is an advantage of a hierarchical name space over a flat name space for a system the size of the Internet? 14. What is the difference between a primary and a secondary DNS? 15. Why do we need POP3 or IMAP for electronic mail? 16. What is the purpose of FTP? 17. What anonymous FTP? 18. How is HTTP related to WWW? 19. What is a URL and what are its components? 20. What is a proxy server and how is it related to HTTP? 21. What does HTML stand for and what is its function? 22. What are the SNMP components? 23. List the SNMP v1 and v2 message types and their function 24. Can two devices connected to the same Frame Relay network use the same DLCIs? 25. Compare an SVC with a PVC 26. How is an ATM virtual connection identified? 27. Why is SONET called a synchronous network?       Assignment 2 1. In a case where reliability is not of importance, UDP would make a good transport Protocol. Give examples of specific cases. 2. Are both UDP and IP unreliable to the same degree? Why or why not? 3. Do port addresses need to be unique? Why or why not? Why are port addresses shorter than IP addresses? 4. Distinguish between network layer and transport layer services. 5. Distinguish between an IP address, a Port address and a Socket address 6. Distinguish between connection oriented and connection-less services. 7. Distinguish between reliable and unreliable services. 8. What are the three stages of connection oriented transmission? 9. Describe the three-way handshake used for TCP connection establishment. 10. What is Flow Control? 11. Distinguish between the flow control provided by the data link layer and the transport layer 12. How does TCP provide error control? 13. Distinguish between the error control provided by the data link layer and the transport layer 14. What is congestion control and how does TCP provides congestion control? 15. Discuss the three phases of TCP congestion control policy. Assignment Part I: Encoding and error control Sam is a computer science student and working on a new micro robot design. The robot continuously sends every two seconds a status string comprising the accelerometer reading (4 bits), ultrasound obstacle detection (6 bits), motor functionality (4 bits) and battery power level (2 bits). a) Calculate the data rate required for robot to remote controller communication b) Explain 3 types of suitable encoding techniques could be used to encode the status string. c) At a certain instance, the sensors provided data as acceleration 5 m/s2 , obstacle at 48 cm, all motors working (i.e. motor functionality 1111), and battery is 75%. i. Write the status string in binary for this instance ii. Represent the status string on ASK, FSK, and PSK encoding techniques d) Calculate the CRC for the status string derived in c) with polynomial divisor 11001101 e) Briefly explain some other error control and flow control techniques that Sam can use to ensure the accuracy of robot control Part II: Multiplexing and multiple access Multiplexing plays an important role in communication as it allows the combination of multiple streams together. Different multiplexing techniques are used for various applications. a) Explain TDM, FDM and CDMA multiplexing techniques with suitable diagrams b) Main air interface in the change from 3G to 4G and WiMAX. Explain how OFDM is different from above techniques and the special feature of signals used by OFDM c) IEEE 802.11ac wireless LAN standard uses 40 MHz total bandwidth in OFDM scheme. MITS5003 Wireless Networks and Communication i. For 48 subscribers what should be the subcarrier bandwidth ( fb ) ? ii. Propose a suitable subcarrier bit time of T to achieve orthogonality iii. Explain how OFDM overcomes the issue of inter symbol interference (ISI) Part III: Wi-Fi Prime Living is a real estate company based in Victoria and you work form them as a consultant network engineer. The company has decided to open a new office in South Eastern suburbs and the floor plan of the building is shown below. The office consists of 5 rooms and on average 8 employees work at each room. The lounge is used by both staff and customers and on average about 25 devices connect to Wi-Fi. The clients wants you to design the network for them with at least 100 Mbps data rate for all wireless connections. As resources you’ve got one distribution system and few access points of 10 m range. a) Design the network specifying the locations of access points and distributions system showing the backbone network. b) Calculate the BSS and ESS sizes c) Calculate the throughput for the DS d) Recommend a suitable IEEE substandard for the network and give reasons for your choice e) Recommend suitable security strategies for the network

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