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problem1a) Why does network segmentation improve LAN performance?

b )  Why network require security? Illustrate the types of security threats ?

problem2) Describe how Internet is the network of Networks? Give the entire process indicating the variety of protocols used, hardware required & the software used.

problem3) Document one backbone network in detail. What devices are attached, what cabling is used, and what is the topology? What networks does backbone connect?

problem4) Give a brief of who’s who in the internet standards world. Also describe their efforts for evolving new internet architecture based on 1PVG.


Cathy’s Collectibles (Case Study)

Your cousin Cathy runs the part-time business out of her apartment.  She buys and sells collectibles like antique prints, baseball cards, and cartoon cells and has recently discovered Web with its many auction sites.  She has begun buying and selling on 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 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.  Describe the differences in these services and make a recommendation.


a) Assume you joined a company which 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.  Will you say this was a well-designed network?  Describe.

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

Computer Network & Security, Computer Science

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