When troubleshooting firewalls, which of the following is not something you should do after you attempt a fix?

a. make multiple fixes

b. repeat the failure

c. test after each attempt

d. reverse or undo solution failures

a. make multiple fixes.

Explanation:

When we are troubleshooting firewalls we should not make multiple fixes after attempting a fix because it will not be beneficial for the security purpose.

We can repeat the failure after attempting the fix because we can fix it but a person with right mind won't be doing that.

We can test after each attempt that it is working properly.

We can also reverse or undo the solution failures after making a fix.