The packets in IP layer are called datagrams?

Question

What is meant by packet as I know packet term is used in Network layer whereas datagrams term used in transport layer ~.

Comments

at n/w layer packets are known as fragments, whereas in transport layer they are known as segments

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At application layer they are known as Message

At Transport layer they are known as Segment

At network layer they are known as Datagrams

At Data link layer they are known as frames