network security

need 150 words for each question 

1b )  

As an Introduction to this course, in your own words, define computer security as it is commonly used in the field today.

Define at least 2 subsets of computer security topics.Discuss the importance of understanding the difference between network security, systems security, and information security within the field of computer security.

2 b )  Compare and contrast the current 802.11ac standard versus 802.11n. Post your response to this in the discussion forum. Note the responses to other students. 

3 b ) Discuss the implications of Public and Private Key vulnerabilities. This question will be posted in the forum.