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The purpose of a network（ ）is to provide a shell around the network which will protect the system connected to the network from various threats .
A.firewall
B.switch
C.router
D.gateway
B.switch
C.router
D.gateway
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RSTPB
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空白（4）处应选择（）A
destinationB
resourceC
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Globally on the ISRB
On the Console and Auxiliary Ports of the ISRC
On the untrusted （Outside） interface of the ISRD
On the trusted （Inside） interface of the ISRE
On the WAN and LAN interfaces of the ISR
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