單項(xiàng)選擇題

Refer to the exhibit,a network administrator cannot establish a telnet session with the indicated router.What is the cause of this failure?（）

A.A level 5 password is not set
B.The vty password is missing
C.The console password is missing
D.An ACL is blocking Telnet access

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多項(xiàng)選擇題

Which two subnetworks would be included in the summarized address of 172.31.80.0 /20？（）

A.172.31.17.4/30
B.172.31.51.16/30
C.172.31.64.0/18
D.172.31.80.0/22
E.172.31.92.0/22
F.172.31.192.0/18

多項(xiàng)選擇題

Which can be done to secure the virtual terminal interfaces on a router?（）

A.Administratively shut down the interfaces.
B.Physically secure the interfaces.
C.Configure a virtual terminal password and login process.
D.Enter an access list and apply it to the terminal interfaces using the access-class command.
E.Create an access list and apply it to the terminal interfaces using the access-group command.

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Refer to the exhibit,a network administrator cannot establish a telnet session with the indicated router.What is the cause of this failure?（）

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Which two subnetworks would be included in the summarized address of 172.31.80.0 /20？ （）

Which can be done to secure the virtual terminal interfaces on a router?（）

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Which two subnetworks would be included in the summarized address of 172.31.80.0 /20？（）