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ComputerNetworks CR320¢ Professor Douglas Lyon¢ Lyon@docjava.com¢ Fairfield University¢ http://www.docjava.com
Course Text¢ Javafor Programmers¢ Available from:   – http://www.docjava.com
Grading¢ Midterm:   1/3¢ Homework: 1/3¢ Final: 1/3¢ Midterm and Final – Take home!
Email¢ Please send me an e-mail asking to be placed on  the CR320 List¢ E-mail: lyon@docjava.com
Pre-reqs¢ You should have CS232 and MA 172¢ OR permission of the instructor¢ You need a working knowledge of Java!
DATA COMMUNICATION NETWORKS      Communication networksswitched                   unswitched
DATA COMMUNICATION  NETWORKS            SwitchedCircuit Switched Packet Switched
DATA COMMUNICATION    NETWORKS   Unswitched(broadcast nets)packet radio        satellite               local   Packet swit...
DATA COMMUNICATION   NETWORKS ckt switched nets have dedicated communication   paths (i.e. telephone) For example:        ...
DATA COMMUNICATION NETWORKS                DishLAN EXAMPLES:
DATA COMMUNICATION NETWORKSEthernet with a bus topology:
DATA COMMUNICATION   NETWORKS              Ring topology net:Note: No switching nodes ,media is shared in LAN For packet r...
Computer Communications  ArchitectureThe Three Layer ModelApplication run on computer which use networks ¢   network layer...
Transmission TerminologyANSI Defs:  – simplex - one direction only  – half-duplex - two-way but not at the    same time.  ...
Transmission Terminology¢CCITT  – CCITT vs ANSI  – simplex = half-duplex  – duplex = full-duplex¢CCITT = international tel...
ISO-OSI Model¢ISO=  International Standards Organization¢OSI = Open Systems Interconnection¢OSI Model = a 7 layer model us...
1. Physical Layer¢Thisis a physicalconnection betweenmachines. BITS
2. Data Link Layer¢Provides reliabletransfer of informationacross the physicallinks. FRAMES/Packetsor DLPDU
3. Network Layer¢Routing
4. TransportLayer¢errorrecoveryand flow control
5. Session  Layer¢Controlforcommunication, close andopen connections
6. PresentationLayer¢Data formatting andcharacter codeconversion
7. Application Layer¢file  transfer,¢virtual terminals, electronic mail¢etc..
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  1. 1. ComputerNetworks CR320¢ Professor Douglas Lyon¢ Lyon@docjava.com¢ Fairfield University¢ http://www.docjava.com
  2. 2. Course Text¢ Javafor Programmers¢ Available from: – http://www.docjava.com
  3. 3. Grading¢ Midterm: 1/3¢ Homework: 1/3¢ Final: 1/3¢ Midterm and Final – Take home!
  4. 4. Email¢ Please send me an e-mail asking to be placed on the CR320 List¢ E-mail: lyon@docjava.com
  5. 5. Pre-reqs¢ You should have CS232 and MA 172¢ OR permission of the instructor¢ You need a working knowledge of Java!
  6. 6. DATA COMMUNICATION NETWORKS Communication networksswitched unswitched
  7. 7. DATA COMMUNICATION NETWORKS SwitchedCircuit Switched Packet Switched
  8. 8. DATA COMMUNICATION NETWORKS Unswitched(broadcast nets)packet radio satellite local Packet switched nets are store and forward nets.
  9. 9. DATA COMMUNICATION NETWORKS ckt switched nets have dedicated communication paths (i.e. telephone) For example: node net stationA Broadcast Comm. Net can be WAN, the media is unshared
  10. 10. DATA COMMUNICATION NETWORKS DishLAN EXAMPLES:
  11. 11. DATA COMMUNICATION NETWORKSEthernet with a bus topology:
  12. 12. DATA COMMUNICATION NETWORKS Ring topology net:Note: No switching nodes ,media is shared in LAN For packet radio,every station can hear every other, the media is shared so this is a LAN technology
  13. 13. Computer Communications ArchitectureThe Three Layer ModelApplication run on computer which use networks ¢ network layer - xchange of data between computer and network ¢ transport layer - error detection and correction ¢ application layer - file xfer etc.
  14. 14. Transmission TerminologyANSI Defs: – simplex - one direction only – half-duplex - two-way but not at the same time. – full-duplex - simultaneous two way transmission
  15. 15. Transmission Terminology¢CCITT – CCITT vs ANSI – simplex = half-duplex – duplex = full-duplex¢CCITT = international telegraph and telephone consultive committee
  16. 16. ISO-OSI Model¢ISO= International Standards Organization¢OSI = Open Systems Interconnection¢OSI Model = a 7 layer model used to describe most networks today
  17. 17. 1. Physical Layer¢Thisis a physicalconnection betweenmachines. BITS
  18. 18. 2. Data Link Layer¢Provides reliabletransfer of informationacross the physicallinks. FRAMES/Packetsor DLPDU
  19. 19. 3. Network Layer¢Routing
  20. 20. 4. TransportLayer¢errorrecoveryand flow control
  21. 21. 5. Session Layer¢Controlforcommunication, close andopen connections
  22. 22. 6. PresentationLayer¢Data formatting andcharacter codeconversion
  23. 23. 7. Application Layer¢file transfer,¢virtual terminals, electronic mail¢etc..

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