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What is Difference between IP Packet and IP Datagram


IP Packet
In general, the term packet applies to any message formatted as a packet for reliable service, i.e When a message is delivered with IP (Network Layer) + TCP (Transport Layer) Protocols then the Protocol data unit at Layer 3 is called an IP PACKET.

Note:- A “reliable” service is one that notifies the user if delivery fails.

IP Datagram
The term IP datagram is reserved for packets of an “unreliable” service on Layer 3 of OSI reference model. When a message is delivered with IP (Network Layer) + UDP (Transport Layer) protocols then the Protocol Data Unit at Layer 3 is called an IP Datagram.Note:- “unreliable” Service or Protocol does not notify the user if delivery fails.

Simply Said

IP + TCP = IP Packet

IP + UDP = IP Datagram
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