2019.8.27

Lecture

1. Web guide
2. HTML and CSS I
3. HTML and CSS II
4. HTML and CSS III
5. Basic JS
6. More JS
9. Web servers & server side js
10. asynchrous programming 异步编程
12. SPA & SOA
13. SPA in deep &

Course Assessment

1. Class Participation 5%
2. Programming Assignments 65%
3. Course Project 30%

4 Words

科学、技术、工程、管理

Key aspects of the Internet

• Internet is for freedom of information
• internet Vs. Internet

internet 指的是计算机（之间组成的）网络
Internet 互联网

• Cubnetworks can stand on their own
• Computers can dynamically join and leave the network
• Built on open standards; anyone can create a new device
• Lack of centralized control (mostly)
• Everyone can use it with simple, commonly available software

People and Organizations

• IETF (Internet Engineering Task Force): internet protocol standards
• ICANNL (Internet Corporation for Assigned Names and Numbers): decides top-level domain names
• W3C (World Wide Web ~): Web standards

OSI model

• data layer
• data application
• data presentation
• data session
• segments transport
• packets network
• frames data link
• bits physical

TCP/IP model

和 OSI model 一样分为7层，但是划分不同

IP: Internet Protocol

我不知道这个怎么用

TCP: Transmission Control Protocol

• Multiplexing: multiple programs using the same IP address
  • Port: a number given to each program of service
  • 80: Web browser (443 for secure browsing)
  • 25: Email
  • 22: ssh
  • 21: ftp
• Some programs (such as QQ, games, streaming media programs) use simpler UDP