【Multiplexing(多路技术)与Demultiplexing(多路分解技术)】
1. Multiplexing:Gather data from multiple sockets, enveloping data with header (Later used fordemultiplexing).
2. Demultiplexing:deliver received segments to correct socket.
3. Connectionlessdemultiplexing: UDP socket identified by two tuples (Destination IP Address& Destination Port)
4. Connection-orienteddemultiplexing: TCP socket identified by four tuples (Source IP Address, SourcePort, Destination IP Address and Destination Port).
【UDP用户数据包协议】
1. Features:
A.besteffort service
B.packetmay be lost and out of order
C.noconnection establish
D.simple
E. smallsegment header