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Each network's MTU gives the size of the largest IP datagram that can be carried in a link layer frame. The typical Ethernet MTU is

Each network's MTU gives the size of the largest IP datagram that can be carried in a link layer frame. The typical Ethernet MTU is 1500 bytes. If an application sends 3000 bytes of user data using a TCP byte stream via IPv4 then 1460 bytes can be sent in each frame because each IP datagram consists of a 20-byte header + 1460 bytes of application data = 1480 bytes, with a computed offset field value of 1480/8 = 185. What happens if UDP is used instead of TCP; recall that a UDP header is 8 bytes instead of 20 for TCP? In particular, how much user data can be sent in each Ethernet frame if UDP is used at the Transport Layer?

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