Chapter 1: Computer Networks and the Internet¶ 1.3 网络核心¶ 1.4 分组交换网中的时延、丢包和吞吐量¶ 1.5 协议层次及其服务模型¶ 1.3 The Network Core 1.4 Delay, Loss, and Throughput in Packet-Switched Network 1.5 Protocol Layers and Their Service Models