Which layer of the TCP$/$IP model involves routing?

Link layer

Application layer

Transport layer

Internet layer

Which of the following is most likely to be a MAC address assigned to a NIC?

$24\mathrm{.}17\mathrm{.}232\mathrm{.}7$B

$23\mathrm{.}4$F$\mathrm{.}17\mathrm{.}8$A$\mathrm{.}4$C$.10$

$713\mathrm{.}555\mathrm{.}1212$

$192\mathrm{.}168\mathrm{.}1\mathrm{.}121$