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With firewall works at which layer?

Anonymous

∙ 13y ago

Updated: 4/28/2022

A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function.

Many firewalls today have advanced up the OSI layers and can even understand Layer 7 - the Application Layer.

Wiki User

∙ 13y ago

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Q: With firewall works at which layer?

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If a firewall does nothing more than filter packets at what layer of the OSI model does it operate?

A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function. Many firewalls today have advanced up the OSI layers and can even understand Layer 7 - the Application Layer.

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