We have a tier 1 and tier 2 firewall

What are the use case to host services on tier 2 firewall? e.g. is connection from field enineers/remote workers one of those? What security risks and controls should i be considering for tier 2 services? If services are in the tier 2 firewall; does that mean they are in the DMZ? Should a proxy be put in-front of tier 1 or tier 2 firewall or before?

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