Which Layer Encapsulates the Segment into Packets?

The transport layer encapsulates the application data into transport protocol data units.

Which layer of the OSI model encapsulates segments into packets?

In data communications networks, packet segmentation is the process of dividing a data packet into smaller units for transmission over the network. Packet segmentation happens at layer four of the OSI model; the transport layer.

Which layer encapsulates the segment into packets or datagrams?

Step 3: The Network layer (in the OSI model) or the Internet layer (in the TCP/IP model) takes the data packet or datagram from the Data-Link layer. It de-encapsulates the data packets and checks the packet header whether the packet is routed to the correct destination or not.