Chris Carthern is a senior network engineer for the United StatesDepartment of Defense. He develops and implements multi-million dollar network architectures and IT systems based on customer requirements and US Government standards. He is responsible for training and mentoring junior network engineers and preparing them for network installations and certification exams. Carthern took his BS (honors) in computer science from Morehouse College and his MS in system engineering from the University of Maryland Baltimore County (UMBC). He holds the following certifications: Cisco Certified Network Professional (CCNP), Certified Information Systems Security Professional (CISSP), CompTIA Security+, Brocade Certified Network Professional (BNCP), and ITIL v3. Chris is the co-author of Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA. Chris is also the co-owner of a fitness company, Gareallafit, where he is a blogger and marathon runner that develops custom running plans for people wanting to complete a long distance race.