September 3, 2021

Firewall Default Deny vs IDS/IPS

This is probably a really stupid question:
What is the difference between an IDS/IPS service vs a default deny firewall in terms of security effectiveness? Are you more or less secure using a firewall vs an IDS/IPS system?
I feel like if you are operating on a principle of Default Deny, that an IDS doesn’t really add anything.
Anyone care to interject?

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