What is Down (in computer networking)?
The state of a network when some or all network communications are disrupted. Common reasons for networks being down include:
- Loose connectors on cables
- Breaks or shorts in cables
- Failed networking components
Indications that the network might be down include
- Users complain that they can’t log on to the network or access certain network resources.
- Alarm systems in Simple Network Management Protocol (SNMP) management software start sending administrative alerts or e-mail to administrators.
- The uninterruptible power supply (UPS) unit in the wiring closet generates its annoying high-pitched tone.