$(2$pts$)$ Consider a router that interconnects three subnets: Subnet $1,$ Subnet $2,$ and subnet $3.$ Suppose all of the interfaces in each of these three subnets are required to have the prefix $223\mathrm{.}1\mathrm{.}17/24.$ Also suppose that Subnet $1$ is required to support up to $62$ interfaces, Subnet $2$ is to support up to $106$ interfaces, and Subnet $3$ is to support up to $15$ interfaces. Provide three network addresses $($of the form a$.$b$.$c$.$d$/$x$)$ that satisfy these constraints.

$(3$pts$)$ What technology do we use to mix IPv$4$ and IPv$6$ network? How to deliver a IPv$4$ datagram through a IPv$6$ network. Draw the datagram icon and show how this datagram travel through the following netwink

$(3$pts$)$ According to the following figure,

Destination$-$based forwarding:

$\backslash$table$[[\backslash$table$[[$Switch$],[$Port$]],\backslash$table$[[$MAC$],[$src$]],\backslash$table$[[$MAC$],[$dst$]],\backslash$table$[[$Eth$],[$type$]],\backslash$table$[[$VLAN$],[$ID$]],\backslash$table$[[$VLAN$],[$Pri$]],\backslash$table$[[$IP$],[$Src$]],\backslash$table$[[$IP$],[$Dst$]],\backslash$table$[[$IP$],[$Prot$]],\backslash$table$[[$IP$],[$ToS$]],\backslash$table$[[$TCP$],[$S$-$port$]],\backslash$table$[[$TCP$],[$d$-$port$]],$Action$],[**,**,**,**,**,**,**,51\mathrm{.}6\mathrm{.}0\mathrm{.}8,**,**,**,**,$port$6]]$

IP datagrams destined to IP address $51\mathrm{.}6\mathrm{.}0\mathrm{.}8$ should be forwarded to router output port $6$

design:

a$.$ design and explain a rule in flow table to implement the function of firewall.

b$.$ design and explain a rule in flow table to implement the function of load balancer.

c$.$ There is no clear definition of flow in the network layer? Based on your understanding, what is the flow $($link the flow to the header field in frame$/$datagram$)?$ What is the flow in question a$)$ and b$)?$