In this assignment you are requested to complete the four tasks:
Task 1: Error Detection (4 marks)
Review the handout or other tutorials about Cyclic Redundancy Check (CRC), which is used for error detection during data communication. Answer the following questions:
1. A bit steam or message, M = 10011101, is transmitted from a sender to receiver using the CRC method described in the class. The pattern (or generator) is P =1001. Calculate the CRC (or FCS) for the sender. You must give the details of this calculation.
2. Suppose that the data transmission is successful without any error. Perform calculation using the CRC at the receiver to show it.
3. Suppose that the third bit from the left of the message is inverted during the transmission. It means an error occurs. Show how to use the CRC to detect the error at the receiver.
Task 2: Flow Control (4 marks)
Using the Internet service or books about computer networks, study the “Sliding Window Flow Control”, which is used in TCP protocol. Then, answer the following questions:
1. Describe how this mechanism works in your words.
2. Why is “Sliding Window” scheme more efficient than “Stop and Wait” scheme for flow control?
3. What problem in a network causes TCP to reduce its window size temporarily?
(The answer should be less than 3 pages, including diagrams)
Task 3: WiMAX and Wi-Fi (4 marks)
WiMAX is a new wireless network technology based on the IEEE 802.16 standard. Using the Internet service or books about wireless networks, study this technology. Then, answer the following questions:
1. Why the WiMAX network technology is needed?
2. Briefly discuss the difference between Wi-Fi and WiMAX networks in Medium Access Control (MAC ) layer. In other words, you need to briefly explain how each network achieves frames or packets delivery between two nodes.
3. Give at least three examples of applications of WiMAX networks.
(The answer should be less than 3 pages, including diagrams)
Task 4: LANs Technology (3 marks)
Consider the following diagram containing a number of LANs interconnected by routers.
Answer the questions:
1. How many collision domains are shown in the diagram? Describe the location of each one, and justify your reasons for identifying each one as a collision domain.
2. How many broadcast domains are shown in the diagram? Describe the location of each one, and justify your reasons for identifying each one as a broadcast domain.
3. For Switch 0, assume that it knows the link addresses for all stations on LAN 1. Using the labels shown in the diagram as a substitute for real link addresses, write out Switch 0’s switching table, as far as you can determine. Allocate your own port numbers for each port on the switch.
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