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                                                                            IS04

                                                             Computer Networks

(For CNM Cases)

                                                                     Assignment II

  Assignment Code: 2016IS04A2                                                    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          a)           Why does network segmentation improve LAN performance?

                b)            Why network needs security? What are the types of security threats?

2          Explain how the Internet is a network of Networks?  Give the entire process indicating the various          protocols used, the hardware required & the software used.

3          Document one backbone network in detail. What devices are attached, what cabling is used, and what is               the topology? What networks does the backbone connect?

4          Give  a brief of who’s who in the internet standards world. Also describe their efforts for          evolving new                    internet architecture based on 1PVG.

                                                                          Section-B

Cathy’s Collectibles (Case Study)

Your cousin Cathy runs a part-time business out of her apartment.  She buys and sells collectibles such as antique prints, baseball cards, and cartoon cells and has recently discovered the Web with its many auction sites.  She has begun buying and selling on the Web by bidding on collectibles at lesser-known sites and selling them at a profit at more well-known sites.  She downloads and uploads lots of graphics (pictures of the items she’s buying and selling).  She is getting frustrated with the slow Internet access she has with her 56-Kbps dial-up modem and asks you for advice.  DSL is available at a cost of $60 per month for 1.5 Mbps down and 384 Kbps up.  Cable modem service is available for a cost of $50 per month for 1.5 Mbps down and 640 Kbps up.  Wireless DSL is available in her apartment building for $45 per month for 1.5 Mbps down and 256 Kbps up.  Explain the differences in these services and make a recommendation.

                Questions:

a.            Suppose you joined a company that had a WAN composed of SONET, T carrier services, ATM, and frame relay, each selected to match a specific network need for a certain set of circuits.  Would you say this was a well-designed network?  Explain.

b.            What is a VPN?  What are three types of VPN?