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单选题
It’s a configuration that experts are calling a "firewall sandwich," with the second firewall providinga second level of load balancing after traffic down. What is meant by the term "firewall sandwich"?()
A

 single layer of firewalling

B

 multiple layers of firewalling

C

 firewall connections in either an active or standby state

D

 an architecture in which all traffic between firewalls goes through application-specific servers


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