TCP offers following services to the processes at the application layer: Stream Delivery Service Sending and Receiving Buffers Bytes and Segments Full Duplex Service Connection Oriented Service Reliable Service that means all of above except DHCP all services use TCP.
hey... Here is the information about which protocal use which service. DHCP use UDP services. SMTP use UDP and TCP both services but most of orgnization use TCP. HTTP can run over TCP and SCTP but not over UDP. TFTP use UDP/IP protocal. FTP use TCP.