●●●●● ●●●● 网络的不同之处 ●●● ●●● ●●●● Item Some possibilities Service offered Connection oriented versus connectionless Protocols IP, IPX, SNA, ATM, MPLS, Apple Talk, etc Addressing Flat(802)versus hierarchical (IP) Multicasting Present or absent (also broadcasting) Packet size Every network has its own maximum Quality of service Present or absent; many different kinds Error handling Reliable, ordered, and unordered delivery Flow control Sliding window, rate control, other, or none Congestion control Leaky bucket, token bucket, RED, choke packets, etc. Security Privacy rules, encryption, etc. Parameters Different timeouts, flow specifications, etc Accounting By connect time, by packet, by byte, or not at all 网络的某些不同之处 wei@bbi.edu.cnlinwei@bbi.edu.cn 4 网络的不同之处 网络的某些不同之处