Answer Questions after reading chapter 1
Homework 1
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Answer Questions after reading chapter 1
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- (3 pts) In general terms, what are the three main components of a computer network?
- (5 pts) What is a protocol? Do not copy the definition verbatim from the book.
- (8 pts) Give an example of a human protocol. Detail the sender, receiver, standard messages, and the message timeline. Do not use the one from the book.
- (4 pts) Compare and contrast DSL, cable, and FTTH. Discuss infrastructure, media, speeds, and architecture for full credit.
- (3 pts) What is the difference between guided and unguided media?
- (3 pts) What are the three major classes of guided media and what is the primary use case for each?
- (4 pts) Name four advantages of fiber optic cable over UTP or coax cable.
- (4 pts) What is the end-to-end delay formula for P packets of length L sent over N links of speed R in a packet switched network? Explain the reasoning behind your conclusion.
- (3 pts) Compare and contrast packet and circuit switching methodologies.
- (4 pts) What are the components of total nodal delay?
- (4 pts) What is the difference between transmission delay and propagation delay?
- (8 pts) Assuming a propagation speed of 2×108 m/s, what is the propagation delay for the following link lengths:
- 100 m
- 5000 m
- 100 km
- 10000 km
- (10 pts) A path in a switched circuit has a data rate of 1 Mbps. The exchange of 1000 bits is required to set up the circuit. There is a one-way transmission of 1000 bits during the circuit teardown phase. The circuit is 10,000 km long. Assume a propagation speed of 2×108 m/s and answer the following questions.
- What is the total delay for transmission overhead processes?
- What is the total delay if 2 Kb of data are transmitted during the data transfer phase?
- What is the total delay if 200 Kb of data are transmitted during the data transfer phase?
- What is the total delay if 2 Mb of data are transmitted during the data transfer phase?
- What is the delay per 1 Kb in each case (a, b, c above)?
- (4 pts) Given a transmission speed of R bits/second, a packet size of B bytes, a propagation speed of P meters/second and a cable length of L meters, what size of packet will result in the last bit being transmitted just as the first bit of the packet arrives at the “far end” of the cable?
- (4 pts) Calculate the queueing delay for a packet that arrives to a router that is currently transmitting a packet and has four other packets waiting to be transmitted. Packets are transmitted in the order they are received over a 2 Mbps link. The packet currently in transit is 60% complete and all packets are 1 KB in length.
- (4 pts) Calculate the queueing delay when all packets are of length L, the transmission rate is R, x bits of the currently-being-transmitted packet have been transmitted, and n packets are already in the queue.
- (4 pts) What are the benefits and downsides of protocol layering?
- (3 pts) Compare and contrast TCP and UDP.
- (15 pts) List the 5 layers of the TCP/IP model, the name of the information it processes, and give a one sentence description of its primary purpose.
- (3 pts) What is the difference between the OSI reference model and the TCP/IP model and how does the TCP/IP model handle what it lacks?
