Part IV: Network Architecture

Chapter 13: LAN Architecture

Chapter 14: WAN Architecture

Chapter 15: Cloud Architecture

Part IV Review

Part IV turns the attention away from the concept-configure-verify approach needed for many of the topics seen earlier in this book and in CCNA 200-301 Official Cert Guide, Volume 1. Instead, this part collects topics that will be presented more from an architecture and design perspective. In fact, the CCNA 200-301 exam organizes six exam topics with this same approach, all listed under exam topic 1.2 “Describe characteristics of network topology architectures.” The chapters in this part examine most of those topics.

First, Chapter 13 revisits LAN switching, which was covered to some depth in Volume 1. This chapter discusses campus LAN design concepts and terminology, like the 2 tier and 3 tier terms listed in the exam topics. This chapter also discusses how to supply power over that LAN infrastructure using Power over Ethernet (PoE), as well as the term small office/home office (SOHO).

CCNA 200-301 mentions WAN as an end to itself in one exam topic within the context of topology and architecture. Chapter 14 takes that thread and presents three major WAN architectures, going beyond the concepts you need to know to support the simple WAN cases used in the examples throughout both books so far. Those topics include MPLS VPN WANs, Ethernet WANs, and Internet VPNs.

Chapter 15 completes the architecture-focused chapters with a discussion of cloud architectures. This chapter begins by defining basic concepts and terms related to data centers and cloud and closes with design discussions that show packet flows in a public cloud environment.

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