#KPC #CST #Protocols
- 1. PROTOCOLS IN COMPUTER NETWORK Arvin Bera (Lecturer CST KPC)
- 2. LEARNING OUTCOME TCP UDP Difference Between TCP and UDP
- 3. TCP(TRANSMISSION CONTROL PROTOCOL) It is a connection-oriented communications protocol that facilitates the exchange of messages between computing devices in a network. TCP ensures that the data reaches intended destination in the same order it was sent TCP provides error-checking and recovery mechanism. TCP provides flow control and quality of service. TCP provides full duplex server, i.e. it can perform roles of both receiver and sender.
- 5. TCP 3-WAY HANDSHAKE PROCESS This could also be seen as a way of how TCP connection is established. Before getting into the details.
- 6. STEPS OF 3-WAY HANDSHAKE Step 1 (SYN) : In the first step, client wants to establish a connection with server, so it sends a segment with SYN(Synchronize Sequence Number) which informs server that client is likely to start communication and with what sequence number it starts segments with Step 2 (SYN + ACK): Server responds to the client request with SYN-ACK signal bits set. Acknowledgement(ACK) signifies the response of segment it received and SYN signifies with what sequence number it is likely to start the segments with Step 3 (ACK) : In the final part client acknowledges the response of server and they both establish a reliable connection with which they will start the actual data transfer
- 9. UDP(USERGRAM DATA PROTOCOL) UDP (User Datagram Protocol) is an alternative communications protocol to Transmission Control Protocol (TCP) used primarily for establishing low-latency and loss- tolerating connections between applications on the internet. Unlike TCP, it is unreliable and connectionless protocol Though Transmission Control Protocol (TCP) is the dominant transport layer protocol used with most of Internet services; provides assured delivery, reliability and much more but all these services cost us with additional overhead and latency. Here, UDP comes into picture. For the realtime services like computer gaming, voice or video communication, live conferences; we need UDP. Since high performance is needed, UDP permits packets to be dropped instead of processing delayed packets. There is no error checking in UDP, so it also save bandwidth.
- 10. UDP HEADER
- 11. UDP HEADER Source Port : Source Port is 2 Byte long field used to identify port number of source. Destination Port : It is 2 Byte long field, used to identify the port of destined packet. Length : Length is the length of UDP including header and the data. It is 16-bits field. Checksum : Checksum is 2 Bytes long field. It is the 16-bit one’s complement of the one’s complement sum of the UDP header, pseudo header of information from the IP header and the data, padded with zero octets at the end (if necessary) to make a multiple of two octets.
- 12. APPLICATION OF UDP UDP is suitable protocol for multicasting as UDP supports packet switching UDP is used for some routing update protocols like RIP(Routing Information Protocol). Following implementations uses UDP as a transport layer protocol:NTP (Network Time Protocol) DNS (Domain Name Service) BOOTP, DHCP. NNP (Network News Protocol) Quote of the day protocol TFTP, RTSP, RIP, OSPF.
- 13. WHEN TO USE UDP? Reduce the requirement of computer resources. When using the Multicast or Broadcast to transfer. The transmission of Real-time packets, mainly in multimedia applications.
- 14. TCP VS UDP
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- 16. Thank you