For this lab, you'll disable the sudo timer on your CentOS VM.

1. Log in to the same CentOS virtual machine that you used for the previous lab. We'll be using the user accounts that you've already created.
2. At your own user account command-prompt, enter the following commands:

        sudo fdisk -l
        sudo systemctl status sshd
        sudo iptables -L

You'll see that you only needed to enter the password once to do all three commands.

3. Open visudo with:

        sudo visudo

In the Defaults specification section of the file, add the following line:

        Defaults     timestamp_timeout = 0

Save the file and exit visudo.

4. Perform the commands that you performed in Step 2. This time, you should see that you have to enter a password every time.
5. Open visudo and modify the line that you added so that it looks like this:

        Defaults:lionel     timestamp_timeout = 0

Save the file and exit visudo.

6. From your own account shell, repeat the commands that you performed in Step 2. Then, log in as Lionel and perform the commands again.
7. Note that this same procedure also works for Ubuntu.