单项选择题
A. an upgrade .gz file placed on your FTP server B. an upgrade .tar file placed on your SCP server C. an upgrade .pac file placed on your TFTP or SCP server D. an upgrade CD provided by your Juniper Networks representative
A.user B.read_only C.target_operator D.security_operator
A. the user role B. the ether0 IP address C. the default route for this DX appliance D. the address of a network TFTP server