IDS: Terminology: Inline IDS, IPS and Application Layer Firewall

[Andreas Hess <hess () tkn tu-berlin de>]

Hi,
I wonder if there are any conceptual differences between:
- inline IDSs,
- IPS and
- Application Layer Firewalls

Or are this just three terms that mean the same?
To my understanding all three concepts do access control up to the  
application layer and in addition, they all have a certain impact on  
the network performance as all packets are routed through them.
Regards
Andreas



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