What steps should the DOD take to protect against cyber infrastructure from adversaries such as Iran, Russia and China

This week we look at 3 of the most powerful cyber powers on the globe and discuss how they have the ability to bring down critical infrastructures in the US.  Here is the material in this week's module for you to review before answering this discussion board post: 

There are 2 questions to answer:

1. What steps should the DOD take to protect against cyber infrastructure from  adversaries such as Iran, Russia and China?  

2. What role should DHS play with protecting infrastructures if DOD 2018 cyber policy states that DOD will protect cyber infrastructures?

This post requires an initial post and responses to 2 other students.  Please write your initial post by end of the day,