单选题What is meant by the term "firewall sandwich"？（）Amultiple layers of firewallingBa method of operating firewalls from multiple vendorsCfirewall connections in either an active or standby stateDan architecture in which all traffic between firewalls goes through application-specific serversEan architecture in which all traffic between firewalls goes through application-specific gateways
单选题
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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