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單項(xiàng)選擇題

Which protocol is an open standard protocol frame work that is commonly used in VPNs，to provid secureend-to-end communication？（）

A.L2TP
B.IPsec
C.PPTP
D.RSA

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單項(xiàng)選擇題

If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?（）

A.4094
B.1024
C.8190
D.2046
E.4096

單項(xiàng)選擇題

A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the nework administrator is using for this operation?（）

A.application
B.presentation
C.session
D.transport
E.internet
F.datalink

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