White Paper White Paper Flexible Secure Your Network of Tomorrow Four Principles for Modern Network Design2 THE SECULAR FORCES DRIVING CHANGE 5 Cloud Adoption Data Expansion Hybrid Work THE THREE ERAS OF ENTERPRISE NETWORK DESIGN 6 The First Era: Physical Networks (3-Tier / Spine-Leaf) 7 The Second Era: Virtualized Networking 8 The Third Era: Cloud-Delivered Network and Security Services 9 SASE—A Practical Implementation of Cloud-Delivered Network and Security Services 10 FOUR PRINCIPLES FOR IMPLEMENTING CLOUD-DELIVERED NETWORK AND SECURITY SERVICES 11 PRINCIPLE 1: ELIMINATE SOURCES OF COMPLEXITY 12 Simp

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