payload of a packet

Question

Suppose a packet of length 1800 bytes with minimum header size enter a local area network with MTU (Maximum transfer unit ) of 500 bytes, then how many fragments will be generated from the packet and what is size of the payload of the last packet ?

Comments

But @hs_yadav Sir  "a packet of length 1800 bytes with minimum header size" (20B ) thus payload becomes 1780.

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Right

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4,360

Answer 1

packet size including header=1800B and Packet size excluding header=1800-20(It is minimum header size as given in problem)=1780Byte

Now This packet is going to enter a network in which the MTU (Data+header size at the Data link layer) is 500Byte.

Therefore,

               Data size excluding header at this network will be=480 Byte

Number of Fragments(done by the router)=Ceil(1780/480)=4.

First Fragment Size	Second Fragment Size	Third Fragment Size	Fourth Fragment Size
(480+20)->It is also known as payload	480+20)->It is also known as payload	480+20)->It is also known as payload	(340+20)
			This is our answer which is asked.

Happy Learning

Answer 2

Answer 4,360