Advantages
Using an external bypass switch to connect an in-line appliance such as an IPS has several benefits.
It keeps network traffic flowing when the in-line appliance fails.
It allows the in-line appliance to be removed or serviced without impacting network traffic. For example, an IPS can be taken offline to upgrade signatures, software, or hardware.
The in-line appliance can be moved from one network segment to another without impacting network traffic.
Note that the latter two advantages are not provided by internal bypass-switch functionality that may be integrated within some IPS appliances.
Read more about this topic: Bypass Switch
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