Which of the following is NOT typically used to mitigate the war dialing threat?

John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux-based network. John is working as a root user on the Linux operating system. He wants to change the startup shell of Maria from bash to tcsh. Which of the following commands will John use to accomplish the task?
Each correct answer represents a complete solution. Choose all that apply.

When trace route fails to get a timely response for a packet after three tries, which action will it take?

The TTL can be found in which protocol header?

Which of the following elements is the most important requirement to ensuring the success of a business continuity plan?