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.