【Accounting Network】 —— Chapter 01 Overview

A computer network is a collection of interconnected, autonomous computers.
互连：互通，通信链路；自治：无主从关系

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1.1 Function of accounting network

Data communication, resource sharing ...

1.2 The composition of the accounting network

1.3 Classification of accounting network

ps: [If you want to realize the interconnection between hardware and software of different manufacturers, you must follow the unified standard. 】

1.4 Performance Index

(1) Rate-the rate at which the host connected to the computer network transmits the number of data bits on the digital channel, also known as data rate or bit rate.
The unit is b / s, kb / s, Mb / s, Gb / s.

(2) Bandwidth-In the field of data communication, the highest data rate that a digital channel can transmit
is in b / s, kb / s, Mb / s, Gb / s.

(3) Throughput-that is, the amount of data that passes through a network in a unit time;
unit b / s, Mb / s, etc.

(4) Delay

(5) Delay bandwidth product

(6) Round trip time- RTT, from the sender sending data, to the sender receiving the receiver confirmation.

(7) Utilization rate

1.5 OSI reference model

1.6 Data encapsulation and decapsulation