Security expert Chris Nickerson is often asked by clients to conduct penetration testing of their on$-$site security. Nickerson and crew recently took on such an exercise for a client he describes as "a retail company with a large call center." With some prep work, Nickerson says the team was able gain access to the company's network and database quite easily. Research, locate and read on to find out how they did it and what lessons you can take away for shoring up your organization's defenses.