Information collection of network security rookie learning (1)

Foreword: The information collection chapter contains some common collection content and some common collection methods.
1. Operating system information
Common method: change the case on the navigation page.
Example: www.xxxxx.com/index.html (I scribbled this domain name).
We changed it to www.xxxxx.com/index.Html.
If there is an error on the website, then the operating system used by the website is Linux, and vice versa. . (Using Linux is case sensitive, windows is not case sensitive)
2. Database information
Common methods: use zenmap for port scan or dictionary scan. Judge after scanning.
Judging rules: asp+access or mysql
aspx+mysql php+mysql jsp+mssql or oracle
Linux does not exist asp, aspx, iis

(zenmap)

(Royal Sword)
3.
Commonly used method of CDN : super ping