![]() The remainder of this chapter focuses on a couple of key switching concepts in relation to campus networks that are found throughout this text. These architectures use bleeding-edge technologies such as FabricPath, Dynamic Fabric Allocation (DFA), Application Centric Infrastructure (ACI), and so on. Data centers are in a state of evolution, with the focus on applications, dev/ops, and software programmability. Campus networks generally take a more conservative approach to architectures, using Cisco Catalyst switches and leveraging traditional Layer 2 and Layer 3 hierarchical designs. In today’s networks, LANs have been segmented into distinct functional areas: data centers and campus networks. LAN switching was a popular term to describe LANs built on Cisco Catalyst switches in the 1990s to mid-2000s. The term LAN switching is becoming legacy. This chapter covers the following basic switching topics as a review to CCNA and serves as a teaser for topics covered later in chapter: If you have a very good understanding of switching terminology and a basic understanding of switching technology, you may want to skip this chapter and begin with Chapter 2, “Network Design Fundamentals.” ![]() Because each technology covered, such as spanning tree or virtual LANs (VLANs), can exist by itself, the short technology highlights in the chapter reduce cross-referencing of chapters. Before journeying into Cisco campus networks and detail technology readouts to prepare for CCNP: Switch, this chapter quickly reviews several topics covered in CCNA and briefly introduces a few topics to ease comprehension of this book. ![]()
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