Which IPS mode is less secure than other options but allows optimal network throughput?

Which IPS mode is less secure than other options but allows optimal network throughput?
A . Promiscuous mode
B . inline mode
C . transparent mode
D . inline-bypass mode

Answer: A

Explanation:

The recommended IPS deployment mode depends on the goals and policies of the enterprise. IPS inline mode is more secure because of its ability to stop malicious traffic in real-time, however it may impact traffic throughput if not properly designed or sized. Conversely, IPS promiscuous mode has less impact on traffic throughput but is less secure because there may be a delay in reacting to the malicious traffic.

https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Security/SAFE_RG/safesmallentnetworks.html