When Nana Pokuaah isn’t working at a pharmacy, she’s in school – though it might not look like it. Eight hours a day, three days a week, Pokuaah, 31, sits in a French cafe in Chantilly, Va., with her laptop, taking an online class that could put her on the front lines of a battle in cyberspace that begins every time a person logs on to a computer. Pokuaah is studying to become a cybersecurity analyst trained in identifying and defeating cyberattacks.