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                                                                            IS04

                                                             Computer Networks

(For CNM Cases)

                                                                      Assignment I

  Assignment Code: 2016IS04A1                                                         Last Date of Submission: 30^th April 2016

                                                                                                        Maximum Marks: 100

Attempt all the questions. All the questions are compulsory and carry equal marks.

                                                                          Section-A

1          Describe three approaches to detecting errors, including how they work, the probability of         detecting an error, and any other benefits or limitations.

  2         Give the purpose of the following devices in relation to networking:

                      a)               Access points

                      b)              Routers

                      c)               Network access cards

                      d)              Server

  3         What are the three ways of reducing errors and the type of noise they affect?

  4         Discuss three trends in communications and networking.

                                                                          Section-B

Eureka! is a telephone and Internet-based check service that specializes in obtaining things that are hard to find (e.g., Superbowl tickets, first edition books from the 1500s, Faberge eggs).  It currently employs 60 staff who work 24 hours per day (over three shifts).  Staff answer the phone and respond to requests entered on the Eureka! Web site.  Much of their work is spent on the phone and on computers searching on the Internet.  What type of connections should Eureka! consider from its offices to the outside world, in terms of phone and Internet?  Outline the pros and cons of each alternative below and make a recommendation.  The company has four alternatives:

Case Questions:

1.       Should it use traditional analog services, with standard voice lines, and use modems to dial into its ISP ($40 per month for each voice line plus $20 per month for each Internet access line)?

2.       Should the company use standard voice lines but use DSL for its data ($60 per month per line for both services)?

3.       Should the company separate its voice and data needs, using standard analog services for voice but finding some advanced digital transmission services for data ($40 per month for each voice line and $300 per month for a circuit with 1.5 Mbps of data)?

4.       Should the company search for all digital services for both voice and data ($60 per month for an all-digital circuit that provides two PCM phone lines that can be used for two voice calls, one voice call and one data call at 64 Kbps, or one data call at 128 Kbps)?