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Describe why UDP uses the pseudo-header to verify that the UDP datagram has reached the correct...

Describe why UDP uses the pseudo-header to verify that the UDP datagram has reached the correct destination, even though the IP layer has already used the destination IP address to ensure that the datagram is addressed to the receiving machine.

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UDP uses pseudo header in order to check whether the data sent is proper or not(i.e Corrupted or damaged).If UDP was successful in sending the packet to the destination ip using the ip layer.The pseudo header added to the data in order to check whether the received packet is damaged or not is checked using a method called Checksum.This pseudo header is completely used in combining(summation) process of checksum.

Where CheckSum is a combination of UDP header+UDP data+pseudo header of ip.

Checksum is 16 bit which is one's compliment value formed by sum of pseudo header which is one's complemented.Where sum of pseudo header of information from internet protocol header,udp header and then the data are padded with zero octets if needed to make it a 16 bit.

It is called as pseudo header of ip as, only a certain redundant data is drawn from internet protocol layer in which data packets are sent.This data is constant through out the transfer and hence if it is damaged,it is called as damaged packet.

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