《COMPUTER NETWORKING-A Top-Down Approach Featuring the Internet》读书笔 记（一）

Computer Networks and the Internet
1. What Is the Internet?
1.1 A Nets-and-Bolts Description
从组成角度解释，Nuts-and-Bolts是螺帽和螺钉的意思。End systems，就是host主机。
1.2 A Service Description
从提供服务角度解释
1.3 What Is a Protocol?
类比人来给出协议的定义: A protocol defines the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
2. The Network Edge
2.1 End System, Clients, and Servers
主机，客户端，服务器端的概念
2.2 Connectionless and Connection-Oriented Service
无连接的和面向连接的服务，UDP & TCP
3. The Network Core
3.1 Circuit Switching and Packet Switching
电路交换和分组交换。电路交换的多路复用：频分（FDM）和时分（TDM）
3.2 Packet-Switched Networks: Datagram Networks and Virtual-Circuit Networks
数据报网络和虚电路网络
4. Access Networks and Physical Media
4.1 Access Networks
Residential access (DSL & HFC), Company access, Wireless access
4.2 Physical Media
双绞线、同轴电缆等
5. ISPs and Internet Backbones
（略）
6. Delay and Loss in Packet-Switched Networks
6.1 Types of Delay
Processing Delay, Queuing Delay, Transmission Delay, Propagation Delay；Transmission传输延迟 vs Propagation Delay传播延迟，收费站的类比，Dt是分组长度和传输率的函数，Dp是距离和传播速率的函数。
6.2 Queuing Delay and Packet Loss
等待延迟和分组丢失
6.3 Delay and Routes in the Internet
（略）
7. Protocol Layers and Their Service Models
7.1 Layered Architecture
Application Layer, Transport Layer, Network Layer, Link Layer, Physical Layer.
7.2 Layers, Messages, Segments, Datagrams (怀疑应该是Dataframes), and Frames
传输的信息在各层的不同叫法：应用层传Messages，传输层传Segments，网络层传Dataframes，链路层传Frames。Encapsulation封装的概念。
8. History of Computer Networking and the Internet
（略）

“The Internet and all that it enables is a vast new frontier, full of amazing challenges. There is room for great innovation. Don’t be constrained by today’s technology. Reach out and imagine what could be and then make it happen.”-Leonard Kleinrock, UCLA