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Networks, Internet and Security

Networks, Internet and Security. Networks. What is network? Types of network LAN – Local Area - Ethernet WAN – Wide Area - Internet MAN – Metro. Area - LAN<=50km Wireless - WiFi PAN – Personal Area – Bluetooth Mobile Networks - CDMA/GSM/3G/4G etc WSN - Sensor Networks

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Networks, Internet and Security

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  1. Networks, Internet and Security

  2. Networks • What is network? • Types of network • LAN – Local Area - Ethernet • WAN – Wide Area - Internet • MAN – Metro. Area - LAN<=50km • Wireless - WiFi • PAN – Personal Area – Bluetooth • Mobile Networks - CDMA/GSM/3G/4G etc • WSN - Sensor Networks • RFID (Radio Frequency Identification) Image Source: http://oscar.iitb.ac.in/images/weeklyimages/Networking/Bluetooth.jpg

  3. Networks – Traffic Control • Repeater • Signal boost • Example: Hub • Bridge • Connections same types of networks • Example: Switch • Routers • Connects different types of networks • Gateway Connects different types of protocols Overview A typical Network Picture Source: http://img.zdnet.com/techDirectory/WIFIBRDG.GIF

  4. Networks - Ports • Server Port Numbers • 80 – HTTP • 20/21 – FTP • 25 – SMTP • 53 – DNS • Client Port Numbers • 1025 - 65535 Explanation Example Image Source: http://www.isaserver.org/img/upl/2004rp21109170267623.gif

  5. Networks - Connectivity • RJ = Registered Jack • RJ 11 – Telephone • RJ 45 – Ethernet • Straight Through • Crossover • Rollover Type of Cables for LAN RJ 45 Cable Picture Source: http://en.wikipedia.org/wiki/Ethernet

  6. Internet • History • ARPANET (Advanced Research Projects Agency Network) was the first packet switching network created by United States Department of Defense during cold war. • Internet was first brought online in 1969 connecting 4 computers between UCLA, Stanford Research Institute, UCSB, and the University of Utah • Tim Berners-Lee joined with others, proposed a new protocol in 1989 for information distribution which is now known as World Wide Web. • It took 38 years for radio to reach 50 million users, 13 years for TV, and only 5 years for the Internet. http://www.bizwaremagic.com/quick_internet_history.htm http://www.walthowe.com/navnet/history.html CyberAtlas.com

  7. Internet - Usage http://www.internetworldstats.com/stats.htm

  8. Internet – Packet Switching Image Source: http://www.teach-ict.com/technology_explained/packet_switching/packet.switching.gif

  9. Internet – Some tools • http://visualroute.visualware.com/ • cmd – tracert www.websitename.com

  10. Internet - Video • http://video.google.ca/videoplay?docid=4523214973725842000&ei=JTW6Su_3PI-MqAKnouzyAQ&q=warriors+on+the+net&hl=en# • http://www.youtube.com/watch?v=Ve7_4ot-Dzs Link What is inside the net? Picture Source: http://www.portices.fr/formation/Res/Internet/Res/InternetMonde.gif

  11. Security Overview Complications Image Source: http://filipspagnoli.files.wordpress.com/2009/02/china-censorship-of-the-internet-cartoon.gif http://sohomediatech.com/images/SOHO-MediaTech-wired-network.jpg

  12. Security – Some Stats • At its peak infection rate, about 1 in 12 emails on the Internet were MyDoom Viruses  • It is estimated that PC Viruses cost businesses approximately $55 Billion in damages in 2003. • FTC received 161,000 identity theft complaints last year, the FBI estimates the actual number of victims is probably closer to 500,000 http://www.securitystats.com/

  13. Security - Threats • Virus – Inside the machine • Worm – Machine to machine • Spyware – Collect information from the computer • Adware – Ads popup • Trojan – Type of malware control by a hacker • Phishing – fool the recipient by asking personal information • Network intrusions • Many more

  14. Security - Areas Firewall Biometric Mgmt rules Security IDS Cryptography Antivirus Anti-Spyware

  15. The End

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