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TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
Rip and BGP is in Application layer Ospf is in Transport Layer
Application layer protocols: DNS and HTTP Transport layer protocols: UDP for DNS and TCP for HTTP
**The TCP transport layer protocol uses windowing and acknowledgments for reliable transfer of data. **The TCP and UDP port numbers are used by application layer protocols. **The TCP transport layer protocol provides services to direct the data packets to their destination hosts.
The transport layer segments data whenever the size of the packet is too large to transport efficiently--in practice, this happens whenever the data is too large to fit in a single network layer packet. Although the network layer can also fragment packets, the process is inefficient and generally the transport layer segment size is adjusted so that no further division is required in the network layer. Much more details are here: http://en.wikipedia.org/wiki/TCP_header#Maximum_segment_size