Answered Essay: Where in a frame does an IP datagram travel? What is the role of the MTU? If an IPv4 datagram w

Where in a frame does an IP datagram travel? What is the role of the MTU? If an IPv4 datagram with a payload of 1480 bytes must be sent over a network with an MTU of 500 bytes, how many fragments will be sent? Explain.

Expert Answer


The IP datagram travels inside the physical frame when the it has to be sent over a physical frame. This is technique is known as encapsulation. In this technique the frame consists the details of the data i.e. IP datagram in the protocol field to indicate the receiver that the data field consists of IP datagram as data.

MTU is maximum transfer unit. The role of MTU is to define the maximum amount of the data that can be sent over by using the particular protocol at a particular layer.

If IPv4 datagram payload is 1480 bytes, the number of fragments that will be sent are 4.

As the MTU is 500 bytes, the maximum data that can be sent is 500 bytes. The data is 1480 bytes. Now when the data is divided into fragments each fragmented packet should have a 20 byte header. Therefore, the no of fragments are:

(Header 20)+(Data 480)=500—Fisrt fragment. 1000 bytes payload balance

(Header 20)+(Data 480)=500—Second fragment 520 bytes payload balance

(Header 20)+(Data 480)=500—Third fragment 40 bytes payload balance

(Header 20)+(Data 40)=60—Fourth fragment. Total payload transferred

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