AT&T LTE 8:57 AM 27% clayton.view.usg.edu CCSC 3306-01 - Fall 2020 Homework-1 (Introduction and Network Models, Data and Signals, Digital and Analog Transmission) Assignment date: 25 August 2020 Submission deadline: 03 September 2020 1. What is a protocol and explain why would we need protocols for a communication system? What are some of the factors that determine whether a communication system is a LAN or WAN? Discuss. 2. You have two computers connected by an Ethernet hub at home. Is this a LAN, a MAN, or a WAN? What if the same computers are connected directly via a cable without a hub, can you call it a network? If so, what kind? Explain your reasons in both cases. 3. What happens if one of the stations is unplugged in the bus topology of Figure 1 below? Explain. What is the impact of disconnecting one of the stations in Figure 2 below? Justify your answer. Hub Drop line Dropline Dropline Figure 1. A bus topology connecting three stations. Figure 2. A star topology connecting four stations. 4. In Figure 3, computer A sends a message to computer D via LANI, router RI, and LAN2. Show the contents of the packets and frames at the network and data link layer for each hop interface. D/80 B42 C82 Sender LAN I Receiver LAN 2 Figure 3. Two LANs connected via a router 5. Suppose a computer sends a frame to another computer on a bus topology LAN. The physical destination address of the frame is corrupted during the transmission. What happens to the frame? How can the sender be informed about the situation? Part C. Digital Logic Question C_1(20 points) Please describe the differences and similarities between Latches and FliFlops. Please write clearly and use no more than 2 sentences. Question C_2( 20 points) Please write BOOLEAN function for 2:1 multiplexer Question C_3(20 points) Please draw a TRUTH table for 2:1 multiplexer Intel peve Question C_4( 20 points) Please draw schematic diagram using AND, OR, NOT gates for 2:1 multiplexer Question C_5( 20 points) Please describe SETUP and HOLD times in digital circuits.