多项选择题

What are two security appliances that can be installed in a network? (Choose two.)（）

A.ATM
B.IDS
C.IOS
D.IOX
E.IPS
F.SDM

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多项选择题

What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.)（）

A.Allow unrestricted access to the console or VTY ports.
B.Use a firewall to restrict access from the outside to the network devices.
C.Always use Telnet to access the device command line because its data is automatically encrypted.
D.Use SSH or another encrypted and authenticated transport to access device configurations.
E.Prevent the loss of passwords by disabling password encryption.

单项选择题

For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists？（）

A.IP
B.ICMP
C.TCP
D.UDP

多项选择题

Which of the following are associated with the application layer of the OSI model？（two.）（）

A.ping
B.Telnet
C.FTP
D.TCP
E.IP