Where is an IDS typically deployed?

Where is an IDS typically deployed?

• A. Outside the firewall or inside the firewall
• B. Only inside the firewall
• C. Only at the DMZ border
• D. Only at the VPN gateway

Answer: (A)

An intrusion detection system needs visibility into traffic flowing through the network to identify unauthorized or suspicious activity. To do that effectively, it’s usually placed at points where it can observe traffic as it enters and leaves the network. Putting sensors outside the firewall lets you see what’s coming in before filtering, while placing them inside lets you monitor what and how traffic has been allowed or filtered. Because you want broad visibility, IDS deployments are commonly at the network edge and can be positioned at multiple points—outside or inside the firewall—so they can catch both external threats and what gets past defenses. Limiting placement to only one location (inside only, or only at the DMZ border, or only at a VPN gateway) reduces the ability to detect a full range of activity.

An intrusion detection system needs visibility into traffic flowing through the network to identify unauthorized or suspicious activity. To do that effectively, it’s usually placed at points where it can observe traffic as it enters and leaves the network. Putting sensors outside the firewall lets you see what’s coming in before filtering, while placing them inside lets you monitor what and how traffic has been allowed or filtered. Because you want broad visibility, IDS deployments are commonly at the network edge and can be positioned at multiple points—outside or inside the firewall—so they can catch both external threats and what gets past defenses. Limiting placement to only one location (inside only, or only at the DMZ border, or only at a VPN gateway) reduces the ability to detect a full range of activity.