香港浸会大学：《网络管理 Network Management》课程教学资源（PPT课件讲稿）Chapter 02 Network Management Model

Network Management Chapter 2 Network Management Mode|●。 COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU Network Management Chapter 2 Network Management Model

●●● ●●●● ●●●●● ●●●● ●●●●● Outline ●●●● e What is network management? Network management vocabulary o Evolution of network management o Network implementation design o ISo network management categories ● Management tools COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU Outline ⚫ What is network management? ⚫ Network management vocabulary ⚫ Evolution of network management ⚫ Network implementation design ⚫ ISO network management categories ⚫ Management tools

●●● ●●●● ●●●●● ●●●● What is network management? o In the early days, network was small and local e Network manager' s job includes o Installation: attach PCs, printers, etc to LAN Configuration: NICS, protocol stack, user app's shared printers, etc ● Testing: Ping was sufficient to“ manage" network More devices: bridge router Job was manageable COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU What is network management? ⚫ In the early days, network was small and local ⚫ Network manager’s job includes ⚫ Installation: attach PCs, printers, etc. to LAN ⚫ Configuration: NICs, protocol stack, user app’s shared printers, etc. ⚫ Testing: Ping was sufficient to “manage” network ⚫ More devices: bridge, router ⚫ Job was manageable

●●● ●●●● ●●●●● ●●●● What is network management? o above only deals with configuration Ongoing maintenance issues How to optimize performance? o How to handle failures and network changes? How to extend network capacity? o How to account for network usages? How to solve network security issues? COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU What is network management? ⚫ Above only deals with configuration ⚫ Ongoing maintenance issues ⚫ How to optimize performance? ⚫ How to handle failures and network changes? ⚫ How to extend network capacity? ⚫ How to account for network usages? ⚫ How to solve network security issues?

●●● ●●●● ●●●●● ●●●● What is network management? o In the past, the network manager might take all the responsibilities Today the task has divided into specialties o Server admin ● System admin ● Network admin Security specialist e Different certifications for these Cisco, Novell, Microsoft, Sun, (ISC)2, etc COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU What is network management? ⚫ In the past, the network manager might take all the responsibilities ⚫ Today the task has divided into specialties: ⚫ Server admin ⚫ System admin ⚫ Network admin ⚫ Security specialist ⚫ Different certifications for these ⚫ Cisco, Novell, Microsoft, Sun, (ISC)2 , etc

●●● ●●●● ●●●●● ●●●● What is network management? Today, networks are larger and more complicated, so more demands on network manager How to monitor and control the network effectively and timely? Management tools are needed Network-based management tools: use the network to manage the network〔 remotely) To control Simple Network Management Protocol (SNMP) Management Information Base(MIB Network Management System(NMS) o monitor Remote Monitor(RMON1) COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU What is network management? ⚫ Today, networks are larger and more complicated, so more demands on network manager ⚫ How to monitor and control the network effectively and timely? ⚫ Management tools are needed ⚫ Network-based management tools: use the network to manage the network (remotely) ⚫ To control ⚫ Simple Network Management Protocol (SNMP) ⚫ Management Information Base (MIB) ⚫ Network Management System (NMS) ⚫ To monitor ⚫ Remote Monitor (RMON1)

●●● ●●●● ●●●●● ●●●● What is network management? Definition by Saydam(in Journal of Networks and System Management, published in Dec 1996) Network management includes the deployment, integration and coordination of the hardware, software and human elements to monitor, test, poll, configure, analyze, evaluate and control the network and element resources to meet the real-time, operational performance and Quality of service requirements at a reasonable cost In brief Network management is mostly a combination of local and remote configuration and management with software Remote network management is accomplished when one computer is used to monitor, access, and control the configuration of other devices on the network

COMP4690, by Dr Xiaowen Chu, HKBU What is network management? Definition by Saydam (in Journal of Networks and System Management, published in Dec. 1996): Network management includes the deployment, integration and coordination of the hardware, software, and human elements to monitor, test, poll, configure, analyze, evaluate, and control the network and element resources to meet the real-time, operational performance, and Quality of Service requirements at a reasonable cost. In brief: Network management is mostly a combination of local and remote configuration and management with software. Remote network management is accomplished when one computer is used to monitor, access, and control the configuration of other devices on the network

●●● Network management ●●●● ●●●●● ●●●● ●●●●● vocabulary ●●●● agent do managing managed devices contain dato en tity managed device managed objects whose data is gathered into a network agent data) Management Information management Base miB) managed device protocol agent data agent data managed device managed device COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU Network management vocabulary agent data agent data agent data agent data managed device managed device managed device managed device managing entity data network management protocol managed devices contain managed objects whose data is gathered into a Management Information Base (MIB)

●●● Network management ●●●● ●●●●● ●●●● ●●●●● vocabulary ●●●● e Managed Device o Devices to be monitored/controlled, e.g., router, switch, hub, bridge workstation A managed device may have several managed objects to be managed A software(agent) is installed to provide access to information/parameters(data)about the device, which is called Management Information Base(MIB) ● Managing Entity o Used by the manager/ admin to do network management e PC, notebook terminal etc. installed with a software called Network Management System(NMS) NMs displays/analyzes data from management agents COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU Network management vocabulary ⚫ Managed Device ⚫ Devices to be monitored/controlled, e.g., router, switch, hub, bridge, workstation. ⚫ A managed device may have several managed objects to be managed ⚫ A software (agent) is installed to provide access to information/parameters (data) about the device, which is called Management Information Base (MIB) ⚫ Managing Entity ⚫ Used by the manager/Admin to do network management ⚫ PC, notebook, terminal, etc., installed with a software called Network Management System (NMS) ⚫ NMS displays/analyzes data from management agents

●●● Network management ●●●● ●●●●● ●●●● ●●●●● vocabulary ●●●● o Network Management Protocol Runs between the managing entity and the managed devices The managing entity can query the status of the managed devices and take actions at the devices via its agents Agents can use the protocol to inform the managing entity of exceptional events E.g., SNMP: Simple Network Management Protocol Managing agents located at managed devices are periodically queried by the managing entity through a network management protocol COMP4690, by Dr Xiaowen Chu, HKBU

COMP4690, by Dr Xiaowen Chu, HKBU Network management vocabulary ⚫ Network Management Protocol ⚫ Runs between the managing entity and the managed devices ⚫ The managing entity can query the status of the managed devices and take actions at the devices via its agents ⚫ Agents can use the protocol to inform the managing entity of exceptional events ⚫ E.g., SNMP: Simple Network Management Protocol ⚫ Managing agents located at managed devices are periodically queried by the managing entity through a network management protocol