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1 Homework and Discussion Questions
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Homework Problems and Discussion Questions 1
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Sections 11-14 1) What are the two types of services that the Internet provides to its applications What are some of characteristics of each of these services 2) It has been said that flow control and congestion control are equivalent Is this true for the Internet's connection-oriented service Are the objectives of flow control and congestion control the same 3) Briefly describe how the Internet's connection-oriented service provides reliable transport 4) What advantage does a circuit-switched network have over a packet-switched network 4) What advantages does TDM have over FDM in a circuit-switched network 5) Suppose that between a sending host and a receiving host there is exactly one packet switch The transmission rates between the sending host and the switch and between the switch and the receiving host are R1 and R2, respectively Assuming that the router uses store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L (Ignore queuing and propagation delay) 6) What are some of the networking technologies that use virtual circuits Find good URLs that discuss and explain these technologies 7) What is meant by connection state information in a virtual-circuit network 8) Suppose you are developing a standard for a new type of network You need to decide whether your network will use VCs or datagram routing What are the pros and cons for using VCs Sections 15-17 9) Is HFC bandwidth dedicated or shared among users Are collisions possible in a downstream HFC channel Why or why not
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1 Homework and Discussion Questions
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10) What are the transmission rate of Ethernet LANs For a given transmission rate, can each user on the LAN continuously transmit at that rate 11) What are some of the physical media that Ethernet can run over 12) Dail-up modems, ISDN, HFC and ADSL are all used for residential access For each of these access technologies, provide a range of transmission rates and comment on whether the bandwidth is shared or dedicated 13) Consider sending a series of packets from a sending host to a receiving host over a fixed route List the delay components in the end-to-end delay for a single packet Which of these delays are constant and which are fixed 14) Review the car-caravan analogy in Section 16 Again assume a propagation speed of 100km/hour
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a) Suppose the caravan travels 200 km, beginning in front of one toll booth, passing through a second toll booth, and finishing just before a third toll booth What is the end-to-end delay b) Repeat (a), now assuming that there are 7 cars in the caravan instead of 10
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15) List five tasks that a layer can perform It is possible that one (or more) of these tasks could be performed by two (or more) layers 16) What are the five layers in the Internet protocol stack What are the principle responsibilities for each of these layers 17) Which layers in the Internet protocol stack does a router process Problems 1) Design and describe an application-level protocol to be used between an Automatic Teller Machine, and a bank's centralized computer Your protocol should allow a user's card and password to be verified, the account balance (which is maintained at the centralized computer) to be queried, and an account withdrawal (ie, when money is given to the user) to be made Your protocol entities should be able to handle the all-too-common case in which there is not enough money in the account to cover the withdrawal Specify your protocol by listing the messages exchanged, and the action taken by the Automatic Teller Machine or the bank's centralized computer on transmission and receipt of messages Sketch the operation of your protocol for the case of a simple withdrawl with no errors, using a diagram similar to that in Figure 12-1 Explicity state the assumptions made by your protocol about the underlying end-to-end transport service
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