Upload
dhani-ahmad
View
111
Download
1
Tags:
Embed Size (px)
Citation preview
Learning Objectives
• Describe the five levels of network management described by the ISO
• List and explain the objectives of network management
• Define the characteristics of the network that affect user satisfaction
• Describe cost-effective network management techniques
Chapter 11: Network Management 2
Learning Objectives
• Describe how network management objectives are met
• Identify the effect that wireless networks and e-commerce have on network management
• List and explain the types of network monitoring software
• Describe the standards used for network management
Chapter 11: Network Management 3
Introduction
• Network managers have a complex role in the organization
• Must manage voice and data networks, as well as e-commerce
• Many tasks must be performed to manage the networks
• Manager is more visible to the users/customers• Well-defined objectives will provide good
customer service
Chapter 11: Network Management 4
Network Management and the ISO Model
• ISO/IEC 7498-4 defines five areas for network management– Performance Management
• Bandwidth
• Processor & memory availability• Network devices
– Fault Management• Detects and responds to abnormal conditions
• Software defines normal operations of network
Chapter 11: Network Management 5
Network Management and the ISO Model
• ISO/IEC 7498-4– Configuration Management
• Hardware and software make-up of network
– Accounting Management• Charges by IT to other departments for network
use
– Security Management• Authorized use of the network• IDs, passwords, firewalls, antivirus software, data
encryption, formal security procedures
Chapter 11: Network Management 6
Objectives of Network Management
• User Satisfaction– Methods used vary by application– Performance
• Response time• Should be consistent for each application• Communications time
– Time on the communication line– Processing time between client and server
• Response time affected by many events
Chapter 11: Network Management 7
Objectives of Network Management
• User Satisfaction– Availability
• All components available for use when needed• Maintenance schedule should be publicized• Mean Time Between Failures (MTBF)• Mean Time to Repair (MTTR)
– Reliability• Errors expected• Stability of hardware and software
Chapter 11: Network Management 8
Objectives of Network Management
• User Satisfaction– Backup
• Software and hardware
• Disk mirroring – two drives, one controller
• Disk duplexing – two drives, two controllers• Hardware backup depends on the device
Chapter 11: Network Management 9
Objectives of Network Management
• User Satisfaction– Network Uptime
• Patch around the problem
• Replacement– Modems, PCs, NOT mainframes, FEPs
• Repair– Depends on the component– May take a few hours to a few days
Chapter 11: Network Management 12
Objectives of Network Management
• User Satisfaction– Information Availability
• Critical to keep users updated on events
• Scheduled downtimes
• Alternative work schedules• Help desk
Chapter 11: Network Management 13
Objectives of Network Management
• Cost-Effectiveness– Prior Planning
• Key to the success of a network project
• Volume and type of data must be considered
• Plan for expansion of the network• Buying equipment
– Buy only for current needs– Buy for current and future needs
Chapter 11: Network Management 14
Objectives of Network Management
• Cost-Effectiveness– Modular Expansion
• Plan for upgrades to equipment
• Hubs
Chapter 11: Network Management 15
Objectives of Network Management
• Cost-Effectiveness–Equipment Expansion
• Buy new equipment for each expansion
–Relocation of Equipment• Reuse clients and servers in other locations
Chapter 11: Network Management 16
Meeting the Objectives
• Staffing– Skills required
• Design and configuration• Diagnosis (Troubleshooting)• Documentation
Chapter 11: Network Management 17
Meeting the Objectives
• Network Analysis– Network Statistics
• Performance monitor can gather statistics• Simulation models• Workload generator• Log files• Transaction mix should be checked• Circuit utilization can affect performance
Chapter 11: Network Management 18
Meeting the Objectives
• Network Analysis
– Network Changes• Tuning
– Changes to the network based on the statistics gathered
• Can change transmission speeds, buffer sizes
• Change network configuration
Chapter 11: Network Management 19
Network Management for Wireless Networks and e-Commerce
• Wireless Networks– Managers must know the technology– Videoconferencing, data archiving, data
mirroring – Connecting PDAs and laptop computers to
the LAN– Bandwidth, security, design issues
Chapter 11: Network Management 20
Network Management for Wireless Networks and e-Commerce
• Network Traffic Volume– High volume caused by e-commerce– Corporate portal is now important to business– May slow system response– Bandwidth may need to be increased– Must monitor network closely
Chapter 11: Network Management 21
Network Management for Wireless Networks and e-Commerce
• Internet Network Monitoring Tools– Transaction Monitoring
• End-to-end response time• Dummy transaction created
– Network Performance Monitoring• Service level agreements with ISP
– Live-visitor site monitoring– Human-response monitoring
Chapter 11: Network Management 22
General Network Monitoring Tools
• Classes of Network Monitoring Software– Device management software
• Monitors specific devices
– Enterprise management software• Monitors entire system
– Application management software• Monitors specific applications
Chapter 11: Network Management 23
General Network Monitoring Tools
• Network Management Protocols– Simple Network Management Protocol
(SNMP)• Collects and reports data on network performance
• Data stored in management information base (MIB)
• Security is a problem• Remote monitoring (RMON) extension
– Stores data at a remote site, rather than a central server
Chapter 11: Network Management 24
General Network Monitoring Tools
• Network Management Protocols– Common Management Interface Protocol
(CMIP)• ISO standard
• Newer than SNMP
• More complete monitoring information• Better security• Major changes needed to an SNMP system to
implement CMIP, so it has not been done
Chapter 11: Network Management 25
Summary
• Network managers responsible for both voice and data networks, as well as e-commerce
• ISO defines five levels of network management
• User satisfaction is viewed in terms of response time, equipment availability, network reliability, and information
• Cost-effectiveness is accomplished through prior planning
Chapter 11: Network Management 26
Summary
• Staffing and network analysis can be used to achieve the network managers goals
• Network tuning is used to improve performance• Network performance for wireless and e-
commerce applications is now needed• Network monitoring tools allow the manager to
keep track of how the network is performing• SNMP was originally used, CMIP is newer
Chapter 11: Network Management 27