[Jiwang Notes 01] OSI model of computer network, computer performance index, Nyss criterion and Shannon's theorem, coding and modulation, physical layer equipment

This article mainly introduces the OSI model of computer networks, computer performance indicators, Neyer's criterion and Shannon's theorem, coding and modulation, and physical layer equipment.

Table of contents

1. Computer network

1.1 What is a computer network

(1 Introduction

(2) Composition