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Transcript of Network Management Chapter 18. Objectives Describe how configuration management documentation...
![Page 1: Network Management Chapter 18. Objectives Describe how configuration management documentation enables you to manage and upgrade a network efficiently.](https://reader038.fdocuments.net/reader038/viewer/2022110401/56649e105503460f94afc2c5/html5/thumbnails/1.jpg)
Network ManagementNetwork Management
Chapter 18
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ObjectivesObjectives• Describe how configuration management
documentation enables you to manage and upgrade a network efficiently
• Conduct network monitoring to identify performance and connectivity issues
• Explain how to optimize network performance
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OverviewOverview
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Introduction to Network Introduction to Network ManagementManagement
• Complicated networks are vulnerable• Configuration management is necessary• Configuration management prevents problems
when upgrading
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Three Parts to Chapter 18Three Parts to Chapter 18
• Network Configuration Management• Monitoring Performance and
Connectivity• Network Performance Optimization
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Network Configuration Management
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• Network Configuration Management– Configuration Management
Documentation– Wiring Schematics or Diagrams
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• Configuration Management Documentation– Wiring diagrams– Network diagrams– Baselines– Policies, procedures, and configurations– Regulations
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• Wiring Schematics or Diagrams– Wiring diagram/wiring schematic
• How the wires connect to various switches, etc.• Wiring standards used (CAT53, 568A, fiber, etc.)• Every cable run, telecom closet, etc.• Cross-connects, demarcs, etc.• Telephone runs
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Figure 18.1 Wiring diagram overview
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Figure 18.2 Wiring diagram detail
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• Physical and Logical Network Diagrams– Information not included in wiring
diagrams
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• Physical Network Diagram– Physical runs– Defines types of connections– Routers, switches, servers, CSU/DSU, etc.– Created by network administrator
• Using standardized network topology icons• Using software utility like MS Visio
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Figure 18.3 Physical network diagram
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Figure 18.4 Sample network topology icons
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Figure 18.5 Visio in action
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• Logical Network Diagram– Broadcast domains (circles)– Internet connections (clouds)– Static IP addresses of significant systems– Only critical switches or routers
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Figure 18.6 Logical network diagram
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• Baselines– Benchmark of when everything is working
correctly– Commit to creating often and comparing– Log of performance indicators
• CPU usage• Network utilization• Other performance measurements• Windows Performance Monitor
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• Policies– Acceptable use policy
• What people can and cannot do with network hardware and software
– User training– Security policy
• Level of access for employees• Password complexity and much more
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• Procedures– What to do
• When upgrading components• When adding new user accounts
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• Configurations– How software should be configured– How hardware should be configured– Results of the procedures
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Figure 18.7 Section of SHOW CONFIG
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• Regulations– Rules governing behavior in the workplace– How to keep network and people safe and
productive– Included in configuration management
documentation
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• Change Management Documentation– CompTIA separates detailed overview of
network from how to upgrade it– Normally these are combined into the
change management documentation– Consult documentation before major
changes
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Monitoring Performance and
Connectivity
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• Monitoring Tasks– Create baselines– Ongoing monitoring– Various logs
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• Monitoring Tools– Windows Performance Monitor (PerfMon)
• Monitors behavior of hardware and software• Monitors locally or remotely
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• Configuring Performance Monitor– Object
• System Components• CPU, memory, disk drives, etc.
– Counter• A measurable feature of an object
– Views• A variety of ways of presenting information• Real-time or logged
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• Configuring Performance Monitor– Add counters and objects– For logging, must add entire object– Monitor local or remote computer– Save log files for a snapshot of a point
in time
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Figure 18.8 Performance Monitor in action
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Figure 18.9 Monitoring a remote computer
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Figure 18.10 Selecting performance objects
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Figure 18.11 Logging data
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Figure 18.12 Selecting a log file
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Figure 18.13 Replaying a log file
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• Create multiple baselines– System at rest– System in use
• Revisit and monitor changes to baseline
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• Third-party network monitoring tools– Often expensive– Generate baselines– Monitor in real-time– Alert administrator to problems– Can act as intrusion detection
systems (IDS)– Example: IPSentry by RGE, Inc.
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Figure 18.14 IPSentry at work
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• More about logs– Every OS generates logs– Three types (Windows examples)
• Application logs• Security logs• System logs
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• Log Viewers– Windows Event Viewer– Linux stores logs in /VAR/LOG
• Use text editor to view– Mac OSX GUI viewer called Console
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Figure 18.15 Event Viewer in Windows Vista
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Network Performance Optimization
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• Overview– Network admin keeps network running– Users notice problems quickly– CompTIA Network+ requirements
• Caching• Controlling data throughput• Keeping resources available
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• Caching– Storing requested data in hopes it will be
needed again [in the short term]– Works in many ways on a network– Reduces network workload
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Figure 18.16 Pausing a video on YouTube
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Figure 18.17 Hulu.com (I love this site!)
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• Controlling Data Throughput– Most networks have limited bandwidth
• Growing use• It will eventually get slower• Latency-sensitive applications need consistent
bandwidth• Apps like streaming video require high bandwidth
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• Methods for Controlling Data Throughput– Throttling bandwidth
• Quality of Service (QoS)–Priority to certain ports–Layer 2 of the OSI model
• Traffic Shaping (a.k.a. bandwidth shaping)–Priority by TCP/UDP port number–Layers 3 and 7 of the OSI model
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Figure 18.18 Traffic shaping on a SOHO router
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• Keeping Resources Available– High availability– Fault tolerance– Data backup
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• Data Backup– Desktop or individual server– Enterprise backup– Backup media
• Tape• Local hard drive• Networked storage
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Figure 18.19 Windows Backup
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• Archive bit– A.k.a. archive attribute– Key to effective backups– Turned “on” when a file is saved– Some applications turn it on when
they open a file
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Figure 18.20 The archive bit on these files is on.
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• Backup programs and the archive bit– Depending on backup function selected
• Only backs up files with the archive bit on• Backs up selected files, ignoring state of archive• Turns off archive bit for every file backed up
– Archive bit off means file was backed up– Archive bit on means file has been changed
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• Types of backup– Normal backup – all selected files backed up
and archive bit turned off– Copy backup – like normal without touching
the archive bit– Incremental backup – all selected files with
archive bit turned on; turns off bit– Differential backup – all selected files with
archive bit turned on; leaves bit as is– Daily backup – all files changed; leaves bit off
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Figure 18.21 Incremental vs. differential
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Figure 18.22 Restoring from backups
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• Backup strategies– Must meet organization’s need– Must be able to easily restore– Have a regimen
• What to do with backup media• Rotate media
–Grandfather, father, son (GFS)
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• Other factors in a backup strategy– Uninterruptible power supply (UPS) pro-
tects against short-term power outages– Backup Generator protects against long-
term power outages– RAID and Redundant Hardware
• System automatically uses redundant component after a failure
• Works normally and buys time for administrator to replace failed component
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• Redundant Array of Independent Disks (RAID)– RAID 0
• Data striping across multiple disks (2 minimum)– RAID 1
• Data mirroring (2 disks)– RAID 5
• Disk striping with distributed parity (3 minimum)
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• Other Redundant Hardware– Redundant power supplies– Redundant network connections– Cluster Servers and Load Balancing
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• Cluster servers– Multiple identical servers– If a server goes down, others pick up the
load– Need cluster-aware operating system, such
as Windows Server for the Enterprise