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ELEMENTS OF TRANSPORT PROTOCOL
The presentation outlines the key elements of transport protocols, emphasizing reliable data transfer between source and destination through the transport layer, which manages processes on host systems. It covers essential functions such as addressing, connection establishment and release, flow control, multiplexing, and crash recovery, detailing methods like the three-way handshake for connections and various buffer management strategies. Notably, it highlights the need for specific port addresses in service access and ensures effective communication between multiple application processes.
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ELEMENTS OF TRANSPORT PROTOCOL
- 1. ELEMENTS OF TRANSPORT PROTOCOL A PRESENTATIONBY SHASHANK, ABHISHEK AND UDIT
- 2. TRANSPORT LAYER • Toprovide reliable, cost effective data transfer from source to destination • This layer deals with end to end transfer of data • Here transport entity deals with other host’s transport entity. • Transport layers deals with processes running on the host.
- 3. Elements of Transport Protocol •Addressing • Connection Establishment • Connection Release • Flow Control and Buffering • Multiplexing • Crash Recovery
- 4. Subnet HOST1 HOST2 Router Process Process ENDTO END TRANSMISSION OF PACKET FROM SOURCE TO DESTINATION
- 5. Addressing • Application Processis connected to the TSAP • Entity connects to the NSAP. • There are multiple processes running within the host.
- 6. Application Layer Network Layer TransportLayer Data Link Layer Physical Layer TSAP 1208 NSAP APPLICATION PROCESS TSAP 1582 TSAP 1969 NSAP HOST 1 HOST 2 To access a specific service , we have to mention a specific Port Address. SAP - Service Access Point TSAP- Transport SAP NSAP - Network SAP
- 7. Connection Establishment USER TSAP S1 HOST1 HOST 2 TRANSPORT LAYER S2
- 8. USER TSAP process server HOST 1HOST 2 TIME-OF DAY SERVER TRANSPORT LAYER
- 9. USER TSAP name server HOST 1HOST 2 TIME-OF DAY SERVER TRANSPORT LAYER
- 10. Connection is beingestablished by 3 way handshake Connection Request Acknowledgment Data HOST 1 HOST 2
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- 12. CONNECTION RELEASE • Disconnection connectionbetween two users. • Asymmetric Release • Symmetric Release
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- 14. SYMMETRIC RELEASE DROP REQUEST SEND ACKNOWLEDGEMENT HOST1 HOST 2 DROP REQUEST SEND DATA REQ + START TIMER SEND DATA REQ + START TIMER RELEASE RELEASE
- 15. SYMMETRIC RELEASE DROP REQUEST SENDACK HOST 1 HOST 2 DROP REQUEST SEND DATA REQ + START TIMER SEND DATA REQ + START TIMER RELEASE RELEASE TIMER TIMOUT
- 16. SYMMETRIC RELEASE DROP REQUEST HOST1 HOST 2 DROP REQUEST SEND DATA REQ + START TIMER SEND DATA REQ + START TIMER RELEASE TIMER TIMOUT DROP REQUEST RELEASE TIMER TIMOUT
- 17. FLOW CONTROL • Tocontrol buffer, Transport Layer manages buffer. VARIABLE LENGTH BUFFER FIXED LENGTH BUFFER CIRCULAR BUFFER UNUSED SPACE IS WASTED
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- 20. CRASH RECOVERY • AlwaysRetransmit • First Acknowledgment then write • Retransmit in S0(Sent 2 messages, Ack of both received). No outstanding Packet is present • retransmit in S1(Sent 2 messages, Ack of only 1 received). Here Outstanding Packet is present STRATEGY USED BY SENDING HOST