"Internal vs. External Penetration Tests"

"Internal vs. External Penetration Tests"  Please respond to the following:

• Explain what you believe to be the most important difference between internal and external penetration tests. Imagine you are the manager of an information security program. Determine which you believe to be the most useful and justify your answer.
• From the e-Activity, determine whether or not you believe penetration tests are necessary and an integral part of a security program and discuss why or why not. Imagine you are an information security manager. Explicate whether or not you would consider utilizing penetration testing in your environment, and, if so, in what capacity.