cs441-lecture-20240903

Lecture Notes - CS441

Tuesday, September 3rd 2024

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• 9/9 Monday: speakers
  • 11am - Google
  • 2pm - Nvidia

• Advantages of TCP/IP

  • Open nature
    • Costs nothing to use (free)
    • Open source
  • Flexible
    • Runs on virtually any platform
    • Connects dissimilar OS and devices
  • Routable
    • Transmission carry Network layer addressing info
    • Suitable for large networks
• Four layers
  • Application layer
  • Transport layer
  • Internet layer
  • Network access layer (or Link layer)
• Seven layers
  • Application layer
    • Application
    • Presentation
    • Session
  • Transport layer
    • Transport
  • Internet layer
    • Network
  • Network access layer (or Link layer)
    • Data link
    • Physical

• TCP (Transmission Control Protocol)

• Transport layer protocol
• Provides reliable data delivery services
  • Connection-oriented subprotocol
    • You have to make the connection before sending data
  • Lasts longer
  • Like a reliable car, you trust it doesn’t stop or breaks down
• Establish connection before transmitting
• Uses sequences and checksums
• Provides flow control
  • Prevents overflow
• TCP segment format
  • Encapsulated by IP packet in Network layer
• Becomes IP packet’s “data”
• Increments acknowledgements by one

• UDP (User Datagram Protocol)

• Transport layer protocol
• Provides unreliable data delivery services
  • Connectionless transport service
  • No assurance packets received in correct sequence
  • No guarantee packets received at all
  • No error checking, sequencing
  • Lacks sophistication
• More efficient than TCP
• Useful situations
  • Great volume of data transferred quickly
• The difference between TCP and UDP is handshake

• IP (Internet Protocol)

• Network layer protocol
  • How and where data delivered, including:
• Data’s source and destination addresses