Features of tcp (part 2) .68

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  • EC-604.63
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Transcript

  • 1. Sub-Topic : Features of TCP (Part-2) 1
  • 2. RecapIn the previous topic , you have learnt about • Layers of TCP/IP protocol • Role of transport layer in TCP/IP protocol 2
  • 3. ObjectivesOn completion of this topic, you would be able toknow about• List out the features supported by TCP• Understand features of TCP 3
  • 4. TCP - Features• Numbering System• Byte Number• Sequence Number• Acknowledgement Number• Reliable transfer of data• Flow Control• Error Control• Congestion Control 4
  • 5. TCP – Features ( Contd…)• Inter-operability• Flexibility• Multi-Vendor Support• Window Based Protocol• Connection oriented service• Full duplex data transfer 5
  • 6. TCP – Numbering System• TCP keeps track of the segments being transmitted or received by assigning numbers• Byte Number assigned to data bytes to be transferred• Sequence Number to Segments• Acknowledgement Number to Received segments 6
  • 7. Byte Number• Used for Flow Control and Error Control• All data bytes transmitted in each connection are numbered by the TCP• Numbering starts with a randomly generated number• Numbering is independent in each direction• TCP stores the received data bytes in a sending buffer and numbers them 7
  • 8. Sequence Number• TCP assigns a Sequence number to each segment transmitted• Sequence Number is the first byte number carried in that segment Sequence Number is assigned when • Segment carries both data and control information ( Piggy backing ) • Segment without data, no sequence number • Example : if x  Sequence Number x+1  First Byte Number 8
  • 9. Acknowledgement Number• Indicates number of the next byte that the receiver expects to receive• Acknowledgement number is cumulative• Confirmation to received data bytes 9
  • 10. TCP – Reliable Transfer of Data• Ordered data transfer - the destination host rearranges according to sequence number• Retransmission of lost packets - any cumulative stream not acknowledged will be retransmitted• Discarding duplicate packets• Error-free data transfer 10
  • 11. TCP – Reliable Transfer of Data Client Host Send Packet 1 Start Timer Data Packet Packet should arriveTimer ACK should be sent ACK would normally Arrive at this time Time Expires Retransmit Packet1Timer Start Timer Receive Packet 1 Send ACK 1 Receive ACK 1 Cancel Timer Fig.4 11
  • 12. TCP – Flow Control• limits the rate a sender transfers data to guarantee reliable delivery• The receiver continually hints the sender on how much data can be received (controlled by the sliding window)• When the receiving hosts buffer fills, the next acknowledgment contains a 0 in the window size, to stop transfer and allow the data in the buffer to be processed 12
  • 13. TCP – Error Control• TCP implements an error control mechanism for reliable data transfer• Error Control is byte – oriented• Segments are checked for error detection• Error Control includes detecting • Corrupted Segments and Lost Segments • Out-of-Order Segments • Duplicated Segments 13
  • 14. TCP – Error Control• Error detection & Correction is achieved by – Check Sum – Acknowledgement Numbers – Time-outs 14
  • 15. TCP – Congestion Control• TCP takes in to account the level of Congestion in the network• Congestion level determines the amount of data sent by a sender 15
  • 16. TCP - Interoperability• TCP has become the Industry standard• It supports interoperability across networks• TCP – A frame work used to develop• complete range of computer communication standards 16
  • 17. TCP – Flexibility• TCP allows a variety of implementationsMulti-Vendor Support• TCP is supported by almost all network software• Widely used transport layer protocol 17
  • 18. SummaryIn this class, you have learnt about• TCP is a widely used transport layer protocol• TCP provides process to process, full duplex and connection oriented services• The main features supported by TCP are • Segment Numbering System • Flow Control • Error Control • Congestion Control 18
  • 19. Summary In this topic, you have learnt about• Basic unit of data transfer using TCP is Segment• TCP uses flow control implemented as a sliding window mechanism• Data bytes being transferred in each connection are numbered by TCP• Numbering starts with a randomly generated number 19
  • 20. Summary TCP uses error control to provide reliable service. Error Control is handled by • checksum, acknowledgement and time-outs• Duplicated segments are discarded and Corrupted & lost segments are retransmitted• Data arrived out of order are temporarily stored by receiving TCP• TCP guarantees that no out of order segment is delivered to the process 20
  • 21. Quiz1. TCP is a ____________ layer protocol A. Application B. Transport C. Network D. Physical 21
  • 22. Quiz2. Which of the following features are supported by TCP ? A. Congestion Control B. Error Control C. Flow Control D. All The Above 22
  • 23. Frequently Asked Questions1. Name the protocols used in the Transport Layer of the TCP/IP protocol suite2. What is the purpose of TCP ?3. List the features of TCP4. Explain about the various features supported by TCP 23
  • 24. 3.24 DIFFERENT LAYERS OF TCP/IP 9EC606A.68 24