多项选择题
根据下图，网络连接到路由器R2被汇总为一条192.168.176.0/21的路由，并发给R1。哪两个数据包目的地址R1会转发给R2？（）
A.192.168.194.160
B.192.168.183.41
C.192.168.159.2
D.192.168.183.255
E.192.168.179.4
F.192.168.184.45
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What is the effect of using the service password-encryption comma（）。
A.Only the enable password will be encrypted.
B.Only the enable secret password will be encrypted.
C.Only passwords configured after the command has been entered will be encrypted.
D.It will encrypt the secret password and remove the enable secret password fromthe configuration.
E.It will encrypt all current and future passwords. -
单项选择题
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
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单项选择题
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
