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For additional security on VTY lines, an access list can be configured. What command must be applied to enable the access list on the virtual interface?
access-group
access-class
access-list
transport input ssh
When applying access-lists on a virtual interfaces, the command access-class should be used. The access-group is only used on physical interfaces. (http://www.cisco.com/c/en/us/td/docs/ios/122/ipaddr/command/reference/fiprasr/1rfip1.html#wp1017389)
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