Network Tools:
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Protocol Analyzers

- Sniffer Network Analyzer from Network Associates, Inc.  
- EtherPeek from WildPackets
- Ethereal (a free open-source protocol analyzer) 

Network-Monitoring and Management Tools

- MRTG (Multi Router Traffic Grapher, available under a GNU public license)
- Cricket (available under a GNU public license) 
- Periscope Network Analysis Appliance from Netcordia, Inc.

Remote Monitoring Tools

Cisco Tools 

- CDP
- NBAR (Network-based application recognition)
- IOS NetFlow technology (show ip cache flow )
- Cisco FlowCollector and Data Analyzer 
- CiscoWorks
- Cisco IOS Service Assurance Agent (SAA) 
- Internetwork Performance Monitor (IPM, available as a component of the CiscoWorks Routed WAN Management Solution)