Fewer than 1 percent of networking professionals in the world achieve the Cisco Certified Internetwork Expert (CCIE) certification. So consider Brian McGahan, who has earned 4 of them, a bona fide genius in the field. As Brian marks the 20th anniversary of passing the CCIE Routing and Switching Exam and earns the rarified status of CCIE Lifetime Emeritus tenure, we sit down with him to talk about his journey, lessons learned, and his best advice.