DiscoveryNetworkDesignChapter1EN（思科网络技术学院CCNA4.0 官方资料-CCNA Discovery- CAC建议版DiscoveryPPT 英文版- D4NetworkDesignPPTEN）.ppt

Introducing Network Design Concepts Designing and Supporting Computer Networks – Chapter 1 Objectives Explain how a hierarchical network design creates a stable, reliable, scalable network Explain what factors need to be considered when the Core Layer of a network is designed and implemented Explain which factors need to be considered when the Distribution Layer of a network is designed and implemented Explain which factors need to be considered when the Access Layer of a network is designed and implemented Describe the benefits and security implications of creating server farms Describe the considerations of an implementation of a wireless network design Describe the factors that affect the implementation of VPNs, including how remote workers can be supported Content Index 1.1 Discovering Network Design Basics 1.2 Investigating Core Layer Design Considerations 1.3 Investigating Distribution Layer Design Considerations 1.4 Investigating Access Layer Design Considerations 1.5 Investigating Server Farms and Security 1.6 Investigating Wireless Network Considerations 1.7 Supporting WAN and Remote Workers 1.8 Chapter Summary 1.1 Discovering Network Design Basics 1.1.1 Network Design Overview Building a Good Network: Do not happen by accident. Hard work by network designers and technicians. Designers need to identify network requirements and select the best solutions to meet the needs of a business. 1.1.1 Network Design Overview Up all the time Reliable Secure Easy to modify 1.1.1 Network Design Overview Four Fundamental Network Design Goals: Scalability Availability Security Manageability 1.1.2 The Benefits of a Hierarchical Network Design Core Layer: connects Distribution Layer devices Distribution Layer: interconnects smaller LANs Access Layer: provides connections for hosts and end devices 1.1.2 The Benefits of a Hierarchical Network Design The benefit of dividing a flat network into smaller, more manageable blocks is that local traffic remains local.