2.  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. OverviewA typical Network  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 Picture Source: http://img.zdnet.com/techDirectory/WIFIBRDG.GIF

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

5. Type of Cables for LANRJ 45 Cable  RJ = Registered Jack  RJ 11 – Telephone  RJ 45 – Ethernet ◦ Straight Through ◦ Crossover ◦ Rollover Picture Source: http://en.wikipedia.org/wiki/Ethernet

6. http://www.bizwaremagic.com/quick_internet_history.htm http://www.walthowe.com/navnet/history.html CyberAtlas.com  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.

7. http://www.internetworldstats.com/stats.htm

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

9.  http://visualroute.visualware.com/ http://visualroute.visualware.com/  cmd – tracert www.websitename.com

10. LinkWhat is inside the net?  http://video.google.ca /videoplay?docid=452 3214973725842000&e i=JTW6Su_3PI- MqAKnouzyAQ&q=war riors+on+the+net&hl= en# http://video.google.ca /videoplay?docid=452 3214973725842000&e i=JTW6Su_3PI- MqAKnouzyAQ&q=war riors+on+the+net&hl= en#  http://www.youtube.co m/watch?v=Ve7_4ot- Dzs http://www.youtube.co m/watch?v=Ve7_4ot- Dzs Picture Source: http://www.portices.fr/formation/Res/Internet/Res/InternetMonde.gif

11. OverviewComplications 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. http://www.securitystats.com/  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

13.  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. Biometric Firewall Cryptography Anti- Spyware Antivirus IDS Mgmt rules Security