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# 2012 dc assignment1

## on Sep 24, 2012

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Data Communication assignment on ISO/OSI, Circuit Switching, and Packet Switching.

Data Communication assignment on ISO/OSI, Circuit Switching, and Packet Switching.

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## 2012 dc assignment1Document Transcript

• Data Communication Assignment 1 Submission: Oct 5Q1.Assume that users share a 1 Mbps link*.Also assume that each user requires a 100 Kbps** when transmitting data.Each user uses the link 10% of the time.*1 Mbps link can transmit 106 bits per second of data.**100 Kbps means each user wish to send 105 bits per second of data. (a) If circuit switching is used, how many users can transmit data simultaneously?Q2. Assume the following Number of hops between 2 given end systems are 4. The length of message is 3200 bits. The data rate of all links is 9600 bits per second. This is the speed at which the data is transmitted by a device. Maximum Transfer Unit is 1024 bits The Header size is 16 bits. Connection set up time is 0.2 seconds. Propagation delay between 2 devices is 0.001. (a) In a packet switched network, how many segments will be created? (b) What will be the length of data in each segment?Q3. The CEO of gmarket.co.kr wants to start selling The Face Shop face masks on its portal. TheCEO tells his legal department to look into the legal issues involved with selling The Face Shopface masks. The legal department in turn asks their engineering department for help. As a result,the chief engineer calls the chief engineer at The Face Shop to discuss the technical aspects of theproject. After getting reply from the chief engineer at The Face Shop, the chief engineer atgmarket.co.kr update their legal department about the scheduled meeting time. Finally the twoCEOs, one from gmarket.co.kr and the other from The Face Shop, meet together for dinner atVIPS to discuss the financial aspects of the deal. (a) How many entities or layers are required?
• (b) Which layers across both companies communicate with each other? (c) Which layer finally discusses the deal? (d) Is this an example of multi-layer protocols in the sense of the ISO/OSI?Q4. Answer the following (a) Which layer manages circuit switching? (b) Each packet may or may not follow the same path? Which switching is this? (c) There is no connection set up and connection disbanding phase? Which switching is this? (d) What is contained in the data link layer header?Q5. A new architecture has L layers. An application generates a message of length M bytes. Eachlayer adds a header of length H. (a) What is the total length of the message? (b) What fraction of the total length is header length? Or What fraction of the total bandwidth is utilized by the header?