Choosing to make someone a contractor instead of an employee isn't just a matter of preference. The Fair Labor Standards Act details some of the laws regarding who is and who is not an employee. Contractors must:
Work independently. If you control their schedule, how they accomplish work, where they work, and buy their equipment, they are employees.
Have financial control. Contractors choose how many people or companies they work for. They are free to make contracts with other employers—even your competitors. (You can, of course, prevent them from sharing confidential information with a non-disclosure agreement.) Contractors take on their own profit/loss risk.
Not provide key business functions. A bakery that hires an IT person to come in and set up their network has hired a contractor. IT is not the bakery's core function. But, a bakery that employs a baker as a contractor would have a much more difficult time proving that this person was not an employee.
The CCNP Security professional offers operational support identity and network access control. They will identify and troubleshoot the Cisco network security appliances and the Cisco IOS Software devices that comprise your network's security.