What technology do companies use to make the links between connection between two corporate intranets more secure?

What is the algorithm for building a binary tree program

David is in week 3 of his current ashford course and has a paper due by monday night at midnight. he has finished everything but the concluding paragraph. as he boots up his computer to work on it, he sees a flash across the screen and then the screen goes black. he begins to panic as he tries desperately to turn the laptop back on. david should have saved his work on what kind of portable device?

What provides an array of buttons for quick access to commonly used commands and tools