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單項選擇題

What is meant by the term "firewall sandwich"?()

A.multiple layers of firewalling
B.a method of operating firewalls from multiple vendors
C.firewall connections in either an active or standby state
D.an architecture in which all traffic between firewalls goes through application-specific servers
E.an architecture in which all traffic between firewalls goes through application-specific gateways

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