# About OpManager's Device Monitoring — ManageEngine OpManager

## How does OpManager monitor the devices?

OpManager is an agent-less monitoring and management tool that uses a wide variety of protocols and technologies: ICMP, SNMP, WMI, CLI (Telnet/ SSH), TFTP, SCP, VMware, Citrix and UCS API's. OpManager also includes a Syslog demon, SNMP Trap listener and Flow collectors for NetFlow, sFlow etc. All these and more bring together many network performance monitoring and management capabilities within OpManager.

## Related Products

- [Network Monitoring](https://www.manageengine.com/network-monitoring/?relPrd)
- [Bandwidth Monitoring & Traffic Analysis](https://www.manageengine.com/products/netflow/?relPrd)
- [Network Configuration Management](https://www.manageengine.com/network-configuration-manager/?relPrd)
- [Switch Port & IP Address Management](https://www.manageengine.com/products/oputils/?relPrd)
- [Firewall Management](https://www.manageengine.com/products/firewall/?relPrd)
- [Network Monitoring Software for MSPs](https://www.manageengine.com/network-monitoring-msp/?relPrd)
- [IT Operations Management](https://www.manageengine.com/it-operations-management/)
- [Application Performance Monitoring](https://www.manageengine.com/products/applications_manager/?relPrd)