Title: Chapter 2: LAN Redundancy
Course: RITA MC - CISCO III > Section: Course Outline and Objectives

Overview, Objectives and Outline

Network redundancy is a key to maintaining network reliability. Multiple physical links between devices provide redundant paths. The network can then continue to operate when a single link or port has failed. Redundant links can also share the traffic load and increase capacity.

Multiple paths need to be managed so that Layer 2 loops are not created. The best paths are chosen, and an alternate path is immediately available should a primary path fail. The Spanning Tree Protocols are used to manage Layer 2 redundancy.

Redundant devices, such as multilayer switches or routers, provide the capability for a client to use an alternate default gateway should the primary default gateway fail. A client may now have multiple paths to more than one possible default gateway. First Hop Redundancy Protocols are used to manage how a client is assigned a default gateway, and to be able to use an alternate default gateway should the primary default gateway fail.

This chapter focuses on the protocols used to manage these forms of redundancy. It also covers some of the potential redundancy problems and their symptoms.

Learning Objectives for Chapter 2

- Describe the issues with implementing a redundant network.
- Describe IEEE 802.1D STP operation.
- Describe the different spanning tree varieties.
- Describe PVST+ operation in a switched LAN environment.
- Describe Rapid PVST+ operation in a switched LAN environment.
- Configure Rapid PVST+ in a switched LAN environment.
- Identify common STP configuration issues.
- Describe the purpose and operation of first-hop redundancy protocols.
- Describe the different varieties of first hop redundancy protocols.
- Use Cisco IOS commands to verify HSRP and GLBP implementations.

Perform the following tasks in order to complete this chapter:

- Launch the Chapter 2 learning module
- Complete the Learning Module Activities
- Complete the Chapter 2 Quiz
- Complete the Chapter 2 Exam

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