UDP:more often used for streaming multimedia apps 32 bits o loss tolerant Length,in source port dest port o rate sensitive bytes of UDP →length checksum ▣other UDP uses segment, including o DNS header o SNMP reliable transfer over UDP: Application add reliability at data application layer (message) o application-specific error recovery! UDP segment format Transport Layer 3-17 Transport Layer 3-17 UDP: more  often used for streaming multimedia apps  loss tolerant  rate sensitive  other UDP uses  DNS  SNMP  reliable transfer over UDP: add reliability at application layer  application-specific error recovery! source port # dest port # 32 bits Application data (message) UDP segment format length checksum Length, in bytes of UDP segment, including header