<Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> 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 or the transport layer . Segmentation may be required when: </P>

Which osi layer is responsible for breaking up data into segments