What is the main difference between the implementation of IDS and IPS devices?

What is the main difference between the implementation of IDS and IPS devices?

• An IDS can negatively impact the packet flow, whereas an IPS can not.
• An IDS needs to be deployed together with a firewall device, whereas an IPS can replace a firewall.
• An IDS would allow malicious traffic to pass before it is addressed, whereas an IPS stops it immediately.
• An IDS uses signature-based technology to detect malicious packets, whereas an IPS uses profile-based technology.

Explanation: An IPS is deployed in inline mode and will not allow malicious traffic to enter the internal network without first analyzing it. An advantage of this is that it can stop an attack immediately. An IDS is deployed in promiscuous mode. It copies the traffic patterns and analyzes them offline, thus it cannot stop the attack immediately and it relies on another device to take further actions once it detects an attack. Being deployed in inline mode, an IPS can negatively impact the traffic flow. Both IDS and IPS can use signature-based technology to detect malicious packets. An IPS cannot replace other security devices, such as firewalls, because they perform different tasks.

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