When will a TCP network packet be fragmented at the application layer?

Question

When will a TCP packet be fragmented at the application layer? When a TCP packet is sent from an application, will the recipient at the application layer ever receive the p

Answer 1

Different network segments can have different MTU values. In that case fragmentation can occur. For more information see TCP Maximum segment size

This (de)fragmentation happens in the TCP layer. In the application layer there are no more packets. TCP presents a contiguous data stream to the application.