Subnetting the Network:

Break up $192\mathrm{.}168\mathrm{.}1\mathrm{.}64/26$ into as many subnets as possible, each supporting $8$ hosts.

Hint: When you break up $192\mathrm{.}168\mathrm{.}1\mathrm{.}64/26$ to create smaller subnets, the original $/26$ subnet no longer exists. You will need to recalculate the subnet mask to ensure each new subnet can support $8$ hosts. This means using a $/28$ subnet mask.

Manual IP Configuration for Site $3$:

Router: Assign the last IP address in the subnet to the router at Site $3.$Hosts: Manually configure the hosts, starting from the first available IP address in the subnet.

Subnet Allocation for Serial Links:

Use the last new subnet from the $192\mathrm{.}168\mathrm{.}1\mathrm{.}64/26$ range and further subnet it with $/30$ masks.Allocate these $/30$ subnets to the serial links and configure the routers appropriately.Make sure Router R$1$ uses the first IP address in the new subnet, and other routers follow the same pattern as necessary.

Verification:

Once you$$ve configured the network, ensure all PCs can access cisco.com and facebook.com using their browsers.Specifically, verify that PCs $6,7,$ and $8$ at Site $3$ have internet access.Additionally, select one PC from Site $1$ and one from Site $2$ to confirm they can also reach cisco.com and facebook.com.

Make sure to configure all devices in Site $3$ with static IP addresses, as opposed to using DHCP$.$