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NETWORKING (LECTURE 9)

                                                        MARWARI COLLEGE ,RANCHI

                                                (UNDER RANCHI UNIVERSITY,RANCHI) 

NAME: RAJU MANJHI,PRAKASH KUMAR

SUB: NETWORKING

SEM: CA/IT(IV)

___________________________-____________________________


UDP(USER DATAGRAM PROTOCOL):

The User Datagram Protocol (UDP) is simplest Transport Layer communication protocol available of the TCP/IP protocol suite. It involves minimum amount of communication mechanism. UDP is said to be an unreliable transport protocol but it uses IP services which provides best effort delivery mechanism.

In UDP, the receiver does not generate an acknowledgement of packet received and in turn, the sender does not wait for any acknowledgement of packet sent. This shortcoming makes this protocol unreliable as well as easier on processing.

Features

·        UDP is used when acknowledgement of data does not hold any significance.

·        UDP is good protocol for data flowing in one direction.

·        UDP is simple and suitable for query based communications.

·        UDP is not connection oriented.

·        UDP does not provide congestion control mechanism.

·        UDP does not guarantee ordered delivery of data.

·        UDP is stateless.

·        UDP is suitable protocol for streaming applications such as VoIP, multimedia streaming.

UDP Header

UDP header is as simple as its function.


UDP header contains four main parameters:

·        Source Port  - This 16 bits information is used to identify the source port of the packet.

·        Destination Port  - This 16 bits information, is used identify application level service on destination machine.

·        Length  - Length field specifies the entire length of UDP packet (including header). It is 16-bits field and minimum value is 8-byte, i.e. the size of UDP header itself.

·        Checksum  - This field stores the checksum value generated by the sender before sending. IPv4 has this field as optional so when checksum field does not contain any value it is made 0 and all its bits are set to zero.

 

 

The transmission Control Protocol (TCP): is one of the most important protocols of Internet Protocols suite. It is most widely used protocol for data transmission in communication network such as internet.

Features

·        TCP is reliable protocol. That is, the receiver always sends either positive or negative acknowledgement about the data packet to the sender, so that the sender always has bright clue about whether the data packet is reached the destination or it needs to resend it.

·        TCP ensures that the data reaches intended destination in the same order it was sent.

·        TCP is connection oriented. TCP requires that connection between two remote points be established before sending actual data.

·        TCP provides error-checking and recovery mechanism.

·        TCP provides end-to-end communication.

·        TCP provides flow control and quality of service.

·        TCP operates in Client/Server point-to-point mode.

·        TCP provides full duplex server, i.e. it can perform roles of both receiver and sender.

 


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