广西医科大学：《计算机网络 Computer Networking》课程教学资源（PPT课件讲稿）Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 I8 1INTRODIICTION Describes the process by which communication networks are designed and implemented Discuss the phase of the network design process There are some differences in the design techniques used for WANS LANS and internet www.gxmu.edu.cn

18.1 INTRODUCTION Describes the process by which communication networks are designed and implemented. Discuss the phase of the network design process. There are some differences in the design techniques used for WANs ,LANs, and internet. www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 18.2 NETWORK DESIGN AND IMPLEMNETION PROCESS Develop the statement of requirements Investigate alternatives Phases Network design O Select equipment and vendors Prepare for implementation Implementation cutover www.gxmu.edu.cn

www.gxmu.edu.cn 18.2 NETWORK DESIGN AND IMPLEMNETION PROCESS Prepare for implementation Select equipment and vendors Network design Investigate alternatives Develop the statement of requirements Implementation cutover Phases Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 The network design process may take anywhere from Note1: two weeks to twelve months to complete Management approval is normally required at the end Note2. of most phases of the network design process It is important to document all aspects of work Notes the alternative selected and why it was chosen, the ed including the requirements the alternatives consid estimated cost of implementing the network www.gxmu.edu.cn

www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION The network design process may take anywhere from two weeks to twelve months to complete. Management approval is normally required at the end of most phases of the network design process. It is important to document all aspects of work. including the requirements, the alternatives considered, the alternative selected and why it was chosen, the estimated cost of implementing the network

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 18.3 Requirements Phase o Statement of requirement It is a written description of the driving force behind the proposed network change the reasons that the team is being asked to look into a new or upgraded network. Design begins with a statement of requirements. The network design begins with an evaluation of alternatives.F It is important to understand the requirements for a new or upgraded network to ensure that what is implemented will satisfy the organization's needs. www.gxmu.edu.cn

18.3 Requirements Phase l Statement of requirement It is a written description of the driving force behind the proposed network change – the reasons that the team is being asked to look into a new or upgraded network. Design begins with a statement of requirements. l The network design begins with an evaluation of alternatives.F It is important to understand the requirements for a new or upgraded network to ensure that what is implemented will satisfy the organization’s needs. www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 18.4 Investigate Alternatives 1. Ensure that the best most effective alternative is selected 2. When designing a network or network upgrade alternatives need to be investigated because there are always several ways to meet the requirements or solve existing problems. 3. New technical capabilities can influence a network design. 4. Internet frequently play a part in network designs. 5. When alternatives are being investigated. cost must be considered. Lets save one www.gxmu.edu.cn

18.4 Investigate Alternatives 1.Ensure that the best ,most effective alternative is selected. 2.When designing a network or network upgrade, alternatives need to be investigated because there are always several ways to meet the requirements or solve existing problems. 3.New technical capabilities can influence a network design. 4.Internet frequently play a part in network designs. 5.When alternatives are being investigated ,cost must be considered. www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 Who should be included teams? Network design team is best made up of a combination of specialists from the network department and users from parts of the company that will be affected by the change and who will benefit by its implementation. In addition to the network designers, users of the network should be involved in the design to ensure that the problems with the existing network the desired solutions are understood Sometimes a representative of management also included on the network design team www.gxmu.edu.cn

Who should be included teams？ Network design team is best made up of a combination of specialists from the network department and users from parts of the company that will be affected by the change and who will benefit by its implementation. In addition to the network designers, users of the network should be involved in the design to ensure that the problems with the existing network & the desired solutions are understood. Sometimes a representative of management also included on the network design team. www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 18.5 Network Design This is very difficult work. After alternatives has been gathered. begin to design Modeling. Simulation Traffic patterns. Response times Line turn aroud times Router and modem speeds. This must be estimated www.gxmu.edu.cn

18.5 Network Design This is very difficult work. After alternatives has been gathered. begin to design. Modeling. Simulation. Traffic patterns. Response times . Line turn aroud times. Router and modem speeds. This must be estimated. www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 Network Topology design Laying out the location of the network nodes on a map is useful Relative locations of network nodes suggest certain topologies a Miami Figure 18-2 A map showing the geographic scope of a Figure 18-1 A wiring diagram of a small office building U.S. -based WAN www.gxmu.edu.cn

Network Topology Design Laying out the location of the network nodes on a map is useful.Relative locations of network nodes suggest certain topoloies . www.gxmu.edu.cn Figure 18-2 A map showing the geographic scope of a F U.S.-based WAN. igure 18-1 A wiring diagram of a small office building. Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 Generic cabling system( GCs) GB/T50311-2000 PDS(Premises Distribution System) (综合布线系统) SCS(Structured Cabling System) 结构化布线系统 管子不统 工恨区子系统克 水平子系统 管理子形统 建筑子系统 www.gxmu.edu.cn

Generic cabling system( GCS) GB/T50311-2000 PDS(Premises Distribution System) （综合布线系统） SCS(Structured Cabling System) 结构化布线系统 www.gxmu.edu.cn Chapter 18 NETWORK DESIGN AND IMPLEMENTATION

Chapter 18 NETWORK DESIGN AND IMPLEMENTATION J33 rack coaxial-cable Unshielded Twisted Pair Shielded Twisted Pair fiber www.gxmu.edu.cn

www.gxmu.edu.cn rack coaxial-cable Shielded Twisted Pair fiber Unshielded Twisted Pair Chapter 18 NETWORK DESIGN AND IMPLEMENTATION