Computer Science Homework Help

I need support with this Computer Science question so I can learn better.

1) Explain in your own words what type of information can be obtained by using network scanning techniques and why it is an important intelligence gathering process. 

2)Select one network scanning software tool from below and explain in detail how it works and how detects network vulnerabilities. Provide the site where you obtained your information and include that in your assignment write-up. 2-3 paragraphs. Choose one from below:

a)Super scan b) Network inventory explorer c) PRTG Network Monitor d) Global network inventory scanner e) Net tools f)SoftPerfect Network Scanner g) IP- tools h) Advanced port scanner i) Megaping j) currports