Dcn (transmission control protocol) ppt
- 1. GUIDED BY: PREPARED BY: Prof. G.D.Makwana Vijay Yadav (140403111014) Ravi chaudhri(140403111016) Sankalchand Patel collage of engineering Subject : data communication networks Subjectcode2171008 Transmission Control Protocol
- 2. Content TCP : Transmission Control Protocol HTTP, FTP, ssh
- 4. TCP Reliable, full-duplex, connection-oriented, stream delivery Interface presented to the application doesn’t require data in individual packets Data is guaranteed to arrive, and in the correct order without duplications •Or the connection will be dropped Imposes significant overheads
- 5. Applications of TCP • Most things! HTTP, FTP, … Saves the application a lot of work, so used unless there’s a good reason not to
- 6. • Connections are established using a three-way handshake • Data is divided up into packets by the operating system • Packets are numbered, and received packets are acknowledged • Connections are explicitly closed – (or may abnormally terminate) TCP implementation
- 7. • Source + destination ports • Sequence number • Acknowledgement number • Checksum • Various options TCP Packets
- 8. Destination Port Acknowledgment Number Options... Padding Data... 0 4 10 16 19 24 31 Source Port WindowLen Sequence Number Reserved Flags Urgent PointerChecksum Field Purpose Source Port Identifies originating application Destination Port Identifies destination application Sequence Number Sequence number of first octet in the segment Acknowledgment # Sequence number of the next expected octet (if ACK flag set) Len Length of TCP header in 4 octet units Flags TCP flags: SYN, FIN, RST, PSH, ACK, URG Window Number of octets from ACK that sender will accept Checksum Checksum of IP pseudo-header + TCP header + data Urgent PointerPointer to end of “urgent data” Options Special TCP options such as MSS and Window Scale You just need to know port numbers, seq and ack are added TCP Segment
- 9. HostClient Send Packet 1 Start Timer Retransmit Packet1 Start Timer Packet should arrive ACK should be sent ACK would normally Arrive at this time Receive Packet 1 Send AXK 1 Time Expires Receive ACK 1 Cancel Timer Packet Lost Timer Timer TCP : Data transfer
- 11. THANK YOU