国家重原实室 不同会话过程的标识方法 Circuit-switching Datagram-Switching Guaranteed capacity No guarantees(best effort) Capacity is wasted if data is More efficient bursty Before sending data Send data immediately establishes a path All data in a single flow follows Different packets might follow one path different paths No Reordering of data Packets may be reordered国家重点实验室 不同会话过程的标识方法