Which of the following ways can help secure a modem? (Select the two best answers.)

A. Use the callback feature.
B. Mount the modem to the floor.
C. Use telnet.
D. Used strong passwords.

A. and D. Using the callback feature enables you to set the modem to call a specific person back at a preset phone number. Strong passwords and some type of authentication scheme can also help to secure a modem. Modems are generally not bolted to the floor; however, a PBX device might be. Telnet is an insecure application and protocol; it should be substituted with SSH.