$1)$ Read the article Understand TCP$/$IP addressing and subnetting basicsLinks to an external site.. See these videos to explain IP addresses and subnet masks: IP Address $-$ IPv$4$ vs IPv$6$ TutorialLinks to an external site. and Subnet Mask $-$ ExplainedLinks to an external site.. Good websites to learn about IP addresses and subnet masks are CIDR to IPv$4$ ConversionLinks to an external site. and IP Address ToolsLinks to an external site.. This video shows you how to use these online tools to find the answers for this lab.

$2)$ Split the network $200\mathrm{.}200\mathrm{.}200\mathrm{.}0/24$ into four equal$-$sized subnets. The article Understand TCP$/$IP addressing and subnetting basicsLinks to an external site. gives you the answer.

$3)$ Split the network $200\mathrm{.}200\mathrm{.}202\mathrm{.}0/24$ into two equal$-$sized subnets.

$4)$ For each subnet, use the first available IP address for the subnet's gateway and the last available IP address for the PC$.$ For example, PC$4$ is on the subnet $200\mathrm{.}200\mathrm{.}202\mathrm{.}0/25.$ The gateway's IP address is $200\mathrm{.}200\mathrm{.}202\mathrm{.}1/25,$ and PC$4\text{'}$s IP address is $200\mathrm{.}200\mathrm{.}202\mathrm{.}126/25.$

$5)$ The network $200\mathrm{.}200\mathrm{.}201\mathrm{.}0($red line$)$ connects the two routers. Use $200\mathrm{.}200\mathrm{.}201\mathrm{.}1/24$ and $200\mathrm{.}200\mathrm{.}201\mathrm{.}2/24$ for the two interfaces.

$6)$ Start this lab with this file: Subnet Mask $($starting point$).$pkt$.$ Check the interfaces before you set the gateways' IP addresses. For example, PC$4$ is connected to Fa$0/0$ of Router $1.$ Hence, the IP address of Fa$0/0$ is $200\mathrm{.}200\mathrm{.}202\mathrm{.}1/25.$

$7)$ I have already applied the routing protocol RIP$2$ to both routers. Hence, if the PCs$\text{'}$ IP addresses and default gateways are set up correctly, then any two PCs can ping each other. Their routing tables are shown below, and they also show the network IDs of the six subnets. An excellent online introduction to RIP is hereLinks to an external site.$\mathrm{.}1)$ Read the article Understand TCP$/$IP addressing and subnetting basicsLinks to an external site.. See these videos to explain IP addresses and subnet masks: IP Address $-$ IPv$4$ vs IPv$6$ TutorialLinks to an external site. and Subnet Mask $-$ ExplainedLinks to an external site.. Good websites to learn about IP addresses and subnet masks are CIDR to IPv$4$ ConversionLinks to an external site. and IP Address ToolsLinks to an external site.. This video shows you how to use these online tools to find the answers for this lab.

$2)$ Split the network $200\mathrm{.}200\mathrm{.}200\mathrm{.}0/24$ into four equal$-$sized subnets. The article Understand TCP$/$IP addressing and subnetting basicsLinks to an external site. gives you the answer.

$3)$ Split the network $200\mathrm{.}200\mathrm{.}202\mathrm{.}0/24$ into two equal$-$sized subnets.

$4)$ For each subnet, use the first available IP address for the subnet's gateway and the last available IP address for the PC$.$ For example, PC$4$ is on the subnet $200\mathrm{.}200\mathrm{.}202\mathrm{.}0/25.$ The gateway's IP address is $200\mathrm{.}200\mathrm{.}202\mathrm{.}1/25,$ and PC$4\text{'}$s IP address is $200\mathrm{.}200\mathrm{.}202\mathrm{.}126/25.$

$5)$ The network $200\mathrm{.}200\mathrm{.}201\mathrm{.}0($red line$)$ connects the two routers. Use $200\mathrm{.}200\mathrm{.}201\mathrm{.}1/24$ and $200\mathrm{.}200\mathrm{.}201\mathrm{.}2/24$ for the two interfaces.

$6)$ Start this lab with this file: Subnet Mask $($starting point$).$pkt$.$ Check the interfaces before you set the gateways' IP addresses. For example, PC$4$ is connected to Fa$0/0$ of Router $1.$ Hence, the IP address of Fa$0/0$ is $200\mathrm{.}200\mathrm{.}202\mathrm{.}1/25.$

$7)$ I have already applied the routing protocol RIP$2$ to both routers. Hence, if the PCs$\text{'}$ IP addresses and default gateways are set up correctly, then any two PCs can ping each other. Their routing tables are shown below, and they also show the network IDs of the six subnets. An excellent online introduction to RIP is hereLinks to an external site..