Which layer breaks data into packets (TCP/UDP) for transfers?

Which layer breaks data into packets (TCP/UDP) for transfers?

• A. Data Link Layer
• B. Physical Layer
• C. Network Layer
• D. Transport Layer

Answer: (D)

The Transport Layer handles grouping the data into units suitable for transfer. It takes the data from the upper layers and splits it into segments when using TCP or datagrams when using UDP, adding port numbers and, in TCP’s case, sequence and acknowledgment information to support end-to-end delivery. These transport-layer units are then handed to the Network Layer, which encapsulates them into IP packets for routing. The Data Link Layer frames those packets for a specific link, and the Physical Layer transmits the bits. So, breaking data into transport-level units (segments or datagrams) is the role of the Transport Layer.

The Transport Layer handles grouping the data into units suitable for transfer. It takes the data from the upper layers and splits it into segments when using TCP or datagrams when using UDP, adding port numbers and, in TCP’s case, sequence and acknowledgment information to support end-to-end delivery. These transport-layer units are then handed to the Network Layer, which encapsulates them into IP packets for routing. The Data Link Layer frames those packets for a specific link, and the Physical Layer transmits the bits. So, breaking data into transport-level units (segments or datagrams) is the role of the Transport Layer.