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单选题
Which of the following describes a secure connection over the Internet between two sites?（）
A
FTP
B
VLAN
C
VPN
D
HTTP
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FTPB
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port 443 - SSL connection B
port 8080 ?http C
port 22 - SSH CLI D
port 427 - SLP connection
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By not enabling NAT on the I Psec tunnel interfaceB
By not enabling NAT on the GRE tunnel interfaceC
By configuring the NAT - referenced ACL to not permit the Enterprise trafficD
By asking the ISP to perform NAT in the cloud
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the distance between sites needs to be less than 100 kilometersB
consistency groups should be created to maintain write order on the remote mirrorC
ensure sufficient bandwidth exists on the link based on average application workloadsD
ensuring a low round trip latency of less than 30ms on the WAN connection is required
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