What is a Switch Tap?
While "switch tap" is not a standard networking term commonly found in technical documentation, it most likely refers to a Network TAP (Test Access Point) used in a network environment that involves switches. A Network TAP is a specialized hardware device deployed to non-intrusively capture and copy network traffic for monitoring and analysis.
Based on the provided reference, the primary function of a Network TAP is to intercept data flow between network devices without disrupting the connection. Instead of two switches or routers connecting directly to each other, the network TAP sits between the two devices and all data flows through the TAP.
Here's a breakdown of its key features and how it operates:
- Inline Deployment: A Network TAP is installed directly in the path of the network connection you want to monitor, for example, between a switch and a server, or between two switches.
- Data Interception: All data passing through the monitored link goes through the TAP first.
- Traffic Splitting: Using an internal splitter, the TAP creates a copy of the data for monitoring. This copy is typically sent out through a dedicated monitoring port.
- Passive Monitoring: The original data stream continues its journey unimpeded through the network from the TAP's output port to the destination device. This ensures the operational network traffic is not delayed or altered.
- Full Visibility: Unlike other monitoring methods, TAPs typically capture all traffic, including errors and low-level packet details, providing a complete picture of the data flow.
How a Network TAP Differs from a Direct Connection
A Network TAP adds a step to the connection process specifically for monitoring purposes:
| Connection Type | Data Path | Monitoring Method | Impact on Network Flow |
|---|---|---|---|
| Direct Link | Device A <-> Device B | Typically none without other features | N/A |
| Using a TAP | Device A <-> Network TAP <-> Device B | TAP sends copy to monitoring tool | Original data unimpeded |
Why a "Switch Tap" (Network TAP) is Used
When people refer to a "switch tap," they likely mean using a Network TAP on a link connected to a switch. This is done to gain visibility into the traffic flowing into, out of, or between switches for purposes like:
- Network Performance Monitoring: Analyzing traffic volume and types to identify bottlenecks.
- Security Analysis: Feeding a copy of traffic to Intrusion Detection Systems (IDS) or other security tools.
- Troubleshooting: Capturing packets for detailed analysis when diagnosing network issues.
- Compliance: Recording traffic for auditing or regulatory requirements.
In essence, a "switch tap" refers to the application of a Network TAP technology to capture traffic associated with a network switch in a non-intrusive and comprehensive manner.
