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Ryan Lindfield is an instructor and network administrator with Boson. He has more than 10 years of network administration experience. He has taught many courses designed for CCNA, CCNP, and CCSP preparation, among others. He has written many practice exams and study guides for various networking technologies. He also works as a consultant, where among his tasks are installing and configuring Cisco routers, switches, VPNs, IDSs, and firewalls.