NetworksNetworksMGMT 661 - DannellyNight 2, Part 2

Chapter 7

Basic Network TypesBasic Network TypesLAN - 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▫EthernetEthernet 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 DevicesNetwork DevicesSwitchRouterBridge, Repeater, ...HubPrintersServers

Transmission MediaTransmission 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

So what do I buy?•Which is better Cable or DSL?• It depends on your 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 NetworksVirtual 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 HistoryInternet History

•1969 - ARPAnet•1973 - ARPAnet adds 1st international

nodes (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

ARPAnet 1975 pic fromsom.csudh.edu

Current Number of Domains

http://www.domaintools.com/internet-statistics/

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

Last 24 Hours - Updated June 11, 2012

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

•TCP / IP

Comporium

mon-cre

Steve

Steve'sMom and Dad

Net Neutrality 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 NetA 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?