p1~p37.
Chapter 1 Overview
Stratified
- Layered: link layer (drive, NIC), a network layer (IP,, ICMP, IGMP), transport layer (TCP, UDP), application layer (HTTP, Talent, FTP, SMTP, SNMP, etc.).
- Under three general execution in the kernel, the application layer performs the application process
The IP address of Class 5
A, B, C, D, E5 address class
192.168.1.1 (N1.N2.N3.N4)
A Class: N1 <128
Class B: 128 <= N1 <192
Class C: 192 <= N1 <224
Class D: 224 <= Nl <240
E categories: 240 < N1 <248
Each website address look what type, such as qq.com (125.39.52.26) A class, taobao.com (140.205.94.189) Class B.
Stack
