This is Cisco's official, comprehensive self-study resource for Cisco’s ENSLD 300-420 exam (Designing Cisco Enterprise Networks), one of the most popular concentration exams required for the Cisco Certified Network Professional (CCNP) Enterprise certification. It will thoroughly prepare network professionals to design efficient, reliable, and secure enterprise networks with Cisco technologies. Designed to help you study, prepare for, and pass the CCNP Enterprise 300-420 ENSLD exam on the first attempt, this guide covers every exam objective concisely and logically, with extensive teaching features designed to promote retention and understanding. You'll find: Pre-chapter quizzes to assess knowledge upfront and focus your study more efficiently Foundation topics sections that explain concepts and configurations, and link theory to practice Key topics sections calling attention to every figure, table, and list you must know Exam Preparation sections with additional chapter review features Final preparation chapter providing tools and a complete final study plan A customizable practice test library, including access to two full sample exams offering realistic practice delivered through Pearson's state-of-the-art test prep test engine CCNP Enterprise Design ENSLD 300-420 Official Cert Guide offers comprehensive, up-to-date coverage of all ENSLD #300-420 Designing Cisco Enterprise Networks topics related to: Advanced addressing and routing solutions Advanced enterprise campus networks WANs Security services Network services SDA