Ch 8

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Ch 8

  1. 1. Telecomm, Networks & the Internet
  2. 2. Trend in communication• Telephones,• Internet,• Wi-fi,• fiber optics,
  3. 3. Components of simple network:1. Switch,2. Hub,3. Router,4. Modem,5. Cable Wirings,6. Network Interface card,7. Network Operating System.
  4. 4. Key-Digital Networking Technologies:Client Server
  5. 5. Packet Switching
  6. 6. TCP/IP and Connectivity
  7. 7. Physical Transmission of DataTwisted Pair:
  8. 8. Coaxial Cable:
  9. 9. Fiber Optics:
  10. 10. Wireless Transmission:
  11. 11. Types of Networks:1. LAN (Local Area Network), CAN(Campus A N) Less covering area, Less transmission Speed, Used for few numbers of autonomous computers, Max Speed is 10Mbps.
  12. 12. 2. MAN (Metropolitan Area Networks) More covering area than LAN, Can connect different cities,
  13. 13. 3. WAN (Wide Area Networks) covers entire world networks, connects the continents and countries.
  14. 14. The DOMAIN name system: • What Internet users use to reference anything by name on the Internet • The mechanism by which Internet software translates names to addresses and vice versa "" com edu gov in t m il net o rg n o m in u m m e t a in f o b e r k e le y nwu n a to a rm y uu w est e a st ww wd a k o ta to rn a d o
  15. 15. The Resolution Process• Let’s look at the resolution process step-by- step: annie.west.sprockets.com ping www.nominum.com.
  16. 16. The Resolution Process• The workstation XYZ asks its configured name server, dakota, for www.nominum.com’s address dakota.west.sprockets.com What’s the IP address of www.nominum.com?annie.west.sprockets.com ping www.nominum.com.
  17. 17. The Resolution Process• The name server dakota asks a root name server, m, for www.nominum.com’s address m.root-servers.net dakota.west.sprockets.com What’s the IP address of www.nominum.com?annie.west.sprockets.com ping www.nominum.com.
  18. 18. Copy i The Resolution Processgh • The root server m refers dakota to the com name servers© • This type of response is called a “referral”2001, m.root-servers.netN dakota.west.sprockets.com Here’s a list of theo com name servers.m Ask one of them.num n annie.west.sprockets.comc. ping www.nominum.com.
  19. 19. Copy i The Resolution Processgh • The name server dakota asks a com name server,© f, for www.nominum.com’s address What’s the IP address2 of0 www.nominum.com?01, m.root-servers.netN dakota.west.sprockets.comomnum f.gtld-servers.net n annie.west.sprockets.comc. ping www.nominum.com.
  20. 20. Copy i The Resolution Processgh • The com name server f refers dakota to the© nominum.com name servers2 Here’s a list of the nominum.com0 name servers.0 Ask one of them.1, m.root-servers.netN dakota.west.sprockets.comomnum f.gtld-servers.net n annie.west.sprockets.comc. ping www.nominum.com.
  21. 21. The Resolution Process• The name server dakota asks an nominum.com name server, ns1.sanjose, for www.nominum.com’s address What’s the IP address of www.nominum.com? m.root-servers.net dakota.west.sprockets.com ns1.sanjose.nominum.net f.gtld-servers.netannie.west.sprockets.com ping www.nominum.com.
  22. 22. The Resolution Process• The nominum.com name server ns1.sanjose responds with www.nominum.com’s address m.root-servers.net dakota.west.sprockets.com Here’s the IP ns1.sanjose.nominum.net address for www.nominum.com f.gtld-servers.netannie.west.sprockets.com ping www.nominum.com.
  23. 23. The Resolution Process• The name server dakota responds to annie with www.nominum.com’s address Here’s the IP address for www.nominum.com m.root-servers.net dakota.west.sprockets.com ns1.sanjose.nominum.net f.gtld-servers.netannie.west.sprockets.com ping www.nominum.com.
  24. 24. INTRANET vs. EXTRANETIntranet: An intranet is a private network that iscontained within an enterprise. It may consist ofmany interlinked local area networks.Ranges up to some meters.Ex: intercom in organization.
  25. 25. • Extranet: An extranet is a private network that uses Internet technology and the public telecommunication system to securely share part of a businesss information or operations with suppliers, vendors, partners, customers, or other businesses.
  26. 26. Virtual Private Networks:• is a method of computer networking--typically using the public internet--that allows users to privately share information between remote locations, or between a remote location and a business home network.

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