hardware imposed network segmentation

$3.$ best way to achieve defense in depth

$6.$ using multiple types of authentication

$8.$ redundant power

$9.$ can also take action to prevent a breach from occurring

$10.$ act of avoiding single points of failure

$11.$ limiting services to a number of testing hosts before rolling out to production

$12.192\mathrm{.}168\mathrm{.}1\mathrm{.}1$

$13.$ reducing the attack surface by removing unnecessary components

$14.$ detects attacks and alerts operators