sonicwall and ISA

if I have a sonicwall 2040, why would i need an ISA firewall?
what is the advantage that an ISA provides compared to a sonicwall?

I just want to know if can consolidate both the isa 2006 and Sonicwall 2040
to a sonicwall 3500.
winperezAsked:
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crouthamelaConnect With a Mentor Commented:
The ISA runs as a proxy, which in theory is more secure than a firewall as it fully separates networks and makes requests for clients on behalf of them. In reality the OS of the proxy is less secure than the IOS of the firewall, and the enhanced features such as IPS provide excellent security. I would replace the ISA to simplify the network.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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