When analyzing a search algorithm, we count the number of key comparisons because this number gives us the most useful information.

Which of the following are the two encryption modes used by IPSec?

A) Transport and tunnel B) Network and tunnel C) Internet and tunnel D) Private and tunnel

How many times will this for loop execute? (Note: i is an int.)

```for(i = 100; i > 0; --i) ``` A. 0, the loop will not execute B. 99 C. 100 D. The loop is not written correctly. It would not compile.