ch01: Introduction

MindMap

Introduction

协议分层

image-20200610191031099

TCP/IP的分层

image-20200610191306231

IP地址

Class	Range
A	0.0.0.0 to 127.255.255.255
B	128.0.0.0 to 191.255.255.255
C	192.0.0.0 to 223.255.255.255
D	224.0.0.0 to 239.255.255.255
E	240.0.0.0 to 255.255.255.255

封装

image-20200610191325214

分用

image-20200610191351841

端口号

常用的端口号存放在/etc/services文件中：

grep telnet /etc/services    # 查看telnet端口号
grep domain /etc/services    # 查看DNS端口号