$1.$ Your boss is complaining that her computer can't access the network file server. Your network IP address is $192\mathrm{.}168\mathrm{.}0\mathrm{.}0/27.$ You checked her computer TCP$/$IP settings and found the following:

IP address: $192\mathrm{.}168\mathrm{.}0\mathrm{.}20$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}0$

Default Gateway: $192\mathrm{.}168\mathrm{.}0\mathrm{.}1$

Preferred DNS: $192\mathrm{.}168\mathrm{.}0\mathrm{.}10$

What could be the problem?