Switching Design

This chapter discusses switching network design and includes the following sections:

• Making the Business Case

• Switching Types

• Spanning Tree Protocol

• Multilayer Switching and Cisco Express Forwarding

• Switching Security

• Switching Design Considerations

This first chapter in Part II, "Technologies: What You Need to Know and Why You Need to Know It," discusses switching network design. After introducing why switches are an important part of a network, we examine the different types of switching and then discuss the Spanning Tree Protocol (STP), which is key in Layer 2 switched environments to ensure that redundancy does not cause the network performance to deteriorate. Virtual local-area networks (VLANs) are then described. Two types of Layer 3 switching, multilayer switching (MLS) and Cisco Express Forwarding (CEF), are then introduced. Security in a switched environment is examined next. The chapter concludes with considerations and examples of switched designs.

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