The key here is to fully understand the OSI Model. Depending on the Layer we are talking about, the naming and...
contents of a so-called 'packet' or 'frame' changes.
Beginning from the application Layer (Layer 7), and up to Layer 5, the constructed data is called a "segment". As it moves down the OSI Model to the next Layer (4) it is called a "datagram". On the next Layer (3) we call it a packet and on the final Layer (2) it is called a "frame".
So, a frame contains packets, packets contain datagram's and datagram's contain segments!
If you like, you can download a white paper I created or the OSI Model, which also shows the above in a clear diagram. You can grab your copy from my Web site, www.Firewall.cx, just look in the Downloads>Projects & Documents> Documents, PDF Files&More section.
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