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Networking lecture 1-3-by_Mamun sir


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This a Class Lecture Sheet on Networking Class. Mamun Sir is the Lecturer of that class. Which was held in Atish Dipankar Uninersity.

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Networking lecture 1-3-by_Mamun sir

  1. 1. Data Networking & Communication Md. Abdullah Al Mamun Sr. Lecturer , FST, ADUST Page 1
  2. 2. Chapter 1INTRODUCTION Page 2
  3. 3. What’s in the data?For effective communication – languages, text, audio, videoFor computers: – electrical encoding of data – where is the start of the packet? – which bits contain the length? – is there a checksum? where is it? how is it computed? – what is the format of an address? – byte ordering Page 3
  4. 4. Data Communications Model Page 4
  5. 5. A Communications Model Page 5
  6. 6. Communications TasksTransmission system utilization AddressingInterfacing RoutingSignal generation RecoverySynchronization Message formattingExchange management SecurityError detection and correction Network managementFlow control Page 6
  7. 7. chapter2Network Layer Architecture Page 7
  8. 8. ProtocolsThe instructions and conventions, used tounderstand the format of address and to computechecksum exist at different levels of network, areknown as protocols LayeringTo make easy software development andmaximize flexibility Network protocols aregenerally organized in different layers Page 8
  9. 9. Layering Most popular model of guiding(not specifying) protocol layers is OSI reference model -Adopted and created by ISO -7 layers of protocols OSI Reference Model: Layer 1Transmits and receives raw data to communication medium.Does not care about contents.voltage levels, speed, connectors Examples: RS-232, 10BaseT Physical Page 9
  10. 10. OSI Reference Model: Layer 2 Detects and corrects errors. Organizes data into packets before passing it down. Sequences packets (if necessary). Accepts acknowledgements from receiver.2 Data Link Examples: Ethernet MAC1 Physical Page 10
  11. 11. OSI Reference Model: Layer 3 Relay and route information to destination. Manage journey of packets and figure out intermediate hops (if needed).3 Network2 Data Link1 Physical Examples: IP, X.25 Page 11
  12. 12. OSI Reference Model: Layer 4 Provides a consistent interface for end-to-end (application-to- application) communication. Manages flow control. Network interface is similar to a mailbox.4 Transport3 Network Examples: TCP, UDP2 Data Link1 Physical Page 12
  13. 13. OSI Reference Model: Layer 5 Services to coordinate dialogue and manage data exchange. Session Software implemented switch.5 Manage multiple logical4 Transport connections.3 Network Keep track of who is talking: establish & end2 Data Link communications.1 Physical Examples: HTTP 1.1, SSL, NetBIOS Page 13
  14. 14. OSI Reference Model: Layer 6 Data representation6 Presentation Concerned with the meaning of data bits5 Session Convert between4 Transport machine3 Network representations2 Data Link Examples: XDR, ASN.1, MIME, MIDI1 Physical Page 14
  15. 15. OSI Reference Model: Layer 77 Application Presentation Collection of application-6 specific protocols5 Session4 Transport3 Network Examples: Data Link email (SMTP, POP, IMAP)2 file transfer (FTP) directory services (LDAP)1 Physical Page 15