![]() The devices on that segment share the bandwidth with each other. A hub allows multiple devices to be connected to the same network segment. In review, hubs died off as a product because they are shared-bandwidth devices. Even the simplest multiport Ethernet devices for the home are switches. Hubs are archaic, and the terminology should be avoided. ![]() Definitions in this chapter will ease reading in that manner as well. Moreover, because all campus network features are heavily intertwined, it is difficult to present topics in a serial fashion. Many of these concepts are discussed in more detail in later chapters, but a quick review and definition will help you understand the following chapters. 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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