Transcript Networks
Networks MGMT 661 - Dannelly Night 2, Part 2 Chapter 7 Basic Network Types LAN - Local Area Network ◦ small area (e.g. a building) ◦ small number of machines WAN - Wide Area Network ◦ large area ◦ usually a collection of LANS ◦ MAN - metropolitan area network Old LAN Topologies Bus Network Token Ring Common LAN Topology • Star Network ▫ Ethernet is the most common type of LAN ▫ Advantage: Fault Tolerant ▫ Disadvantage: lots of wires requires a "switch" Network Reality Figure 7-2 from textbook Network Devices Switch Router Bridge, Repeater, ... Hub Printers Servers Transmission Media • Twisted-Pair ▫ used in your house for the phone ▫ used by a DSL Modem ▫ also used for Ethernet • Coaxial Cable ▫ used in your house for cable TV ▫ used by a Cable Modem • Radio ▫ WiFi ▫ Bluetooth • Fiber Optic • Which is better Cable or DSL? So •what doonIyour buy? It depends location. • What type of wireless router do I buy? •A • not on same frequency as phones • short range • B and G • longer range and faster than A • cordless phones can interfere • B is common in airports, etc. •N • fastest, good range • not compatible with B and G Virtual Private Networks • Cost effective method for building your own WAN. • Instead of running your own fiber optic cable, pretend that you did. • Encrypted Data is sent between office locations using a standard internet connection. The Internets • “United States President Bush used the improper pluralization of the word "Internet" publicly during the 2000 election campaign; however, the term gained cachet as an Internet humor meme only following Bush's use of the term in the second 2004 presidential election debate on October 8, 2004.” en.wikipedia.org • “It’s not a truck. It’s a series of tubes.” U.S. Senator Ted Stevens Internet History • 1969 - ARPAnet • 1973 - ARPAnet adds 1st international nodes ARPAnet 1975 pic from som.csudh.edu (London and Norway) • 1977 - first email application • 1984 - DNS introduced with 1000 nodes • 1991 - First web server • 1998 - birth of Google Inc. • 2000 - 27.5 million domains • 2011 - 130 million domains Current Number of Domains Last 24 Hours - Updated June 11, 2012 All New Deleted Transferred TLD 140,697,516 82,549 105,218 104,126 All TLDs 103,649,756 59,749 71,871 74,011 .COM 14,787,883 7,590 10,837 9,777 .NET 9,996,547 4,668 6,119 5,445 .ORG 8,228,889 7,872 13,126 11,814 .INFO 2,249,488 1,419 1,679 1,808 .BIZ 1,784,953 1,251 1,586 1,271 .US http://www.domaintools.com/internet-statistics/ How to create your own domain • Register an IP Address and Name with ICANN • or use a Server Farm http://www.mygtv.net/wp-content/uploads/2009/02/farm2.jpg 14 / 13 October 2009 source: unknown How Info Moves on the Internet • Routing of Packets mon-cre Comporium Steve • TCP / IP Steve's Mom and Dad Net Neutrality • The Internet is mostly neutral. ▫ Every packet is equal to every other packet, regardless of type, destination, or owner. • The Case For Neutrality: ▫ Neutrality ensures a level playing field. • The Case Against Neutrality: ▫ The telecom companies own the "pipes", so they should be allowed to manage them and charge for them however they want. A Non-Neutral Net http://images.appleinsider.com/netneutrality091808.png Next Class • Debates • Ethics and Social Implications ▫ Do you have a right to privacy? ▫ How much does ChoicePoint know about you? ▫ What is the economic value of high speed internet saturation? • Legal Issues ▫ How can Microsoft legally get away with selling such faulty products?