Managing Networks

1
Managing Networks

• Personnel Network Managers vs. Network
  Administrators (Fig. 10-1, pg. 320)
• Responsibilities Manage, Troubleshoot, Plan,
  Change, Support
• Trouble-shooting
• Network Documentation
• Physical and Logical design
• Addressing Scheme
• Protocols
• Statistics
• Configurations
• Resolution Process
• Problem definition, Facts, Possible Cause
  (isolation cut in half, repeat as required),
  Determine and implement remedy (only one remedy
  at a time!), Resolved?
• Yes, document symptoms, cause, remedy. Update
  other documents as required.
• No, repeat process.

2
Application Protocol SNMP

• Simple Network Management Protocol (ports 161,
  162)
• Developed for TCP/IP networks
• System Components
• Network Management Station
• Management Information Base (MIB)
• Agents
• Protocol Data Units (PDUs)
• Commands Get, Set, Trap
• UDP Packets

3
Network Mgt. Tools

• Protocol analyzers capture and analyze traffic
• examine the actual content (headers, file) being
  transmitted
• Network simulation programs
• Simulate traffic on a network to determine
  potential bottlenecks (high utilization links)
• Utilities ping, tracert, ipconfig, arp

4
Life Cycle Management

• Network design, installation, management,
  upgrades, and replacement
• Non-standard equipment may significantly increase
  the TCO
• Total Cost of Ownership (TCO)
• Hardware, software, labor, and WAN services
  Initial, ongoing, and periodic
• Outsourcing option
• Labor staff a function internally or outsource
• Network Purchase and maintain a system (or
  system component) or outsource
• Evaluating alternatives Multi-criterion
  decision making