This document discusses network management. It describes the five levels of network management defined by the ISO, including performance, fault, configuration, accounting, and security management. The objectives of network management are to ensure user satisfaction through metrics like response time, availability, and reliability, as well as cost-effectiveness through prior planning. Network managers must oversee both voice and data networks as well as e-commerce. Various network monitoring tools and protocols are discussed.

1. Business Data Communications,
Fourth Edition
Chapter 11: Network
Management

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. Chapter 11: Network Management 10

11. Chapter 11: Network Management 11

12. 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

13. 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

14. 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

15. Objectives of Network
Management
• Cost-Effectiveness
– Modular Expansion
• Plan for upgrades
to equipment
• Hubs
Chapter 11: Network Management 15

16. 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

17. Meeting the Objectives
• Staffing
– Skills required
• Design and configuration
• Diagnosis (Troubleshooting)
• Documentation
Chapter 11: Network Management 17

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. Chapter 11 Complete