Switch number: The same switch as determined in question $19$ above.

$22)$ Interface number: In the IPv$6$ address $15$:$16$:$17$:$18$::$19/64,$ which value represents the subnet?

$23)$ Switch number: Worldwide, IPv$6$ is more common then IPv$4(1=$true, $2=$false$).$

$24)$ Interface number: Convert $00010110$ to decimal.

to

$7\mathrm{.}7\mathrm{.}7\mathrm{.}7$

$25)$ Switch number: The same switch as determined in question $23$ above.

$26)$ Interface number: How many bits are in a MAC Address OUI?

$27)$ Switch number: How many nibbles are in a byte?

$28)$ Interface number: How many usable IP addresses are on a network with a $255\mathrm{.}255\mathrm{.}255\mathrm{.}240$ subnet mask?