Consider the following Figure $4,$ where several subnets are interconnected by two routers, i$.$e$.,$ R$1$ and R$2.$Fig. $41.$Describe the difference between router and switch? $(6$ points$)2.$If the interface of R$2$ in subnet $2$ has an IP address $192\mathrm{.}168\mathrm{.}2\mathrm{.}2,$ assign IP addresses to all the other interfaces in subnet $2,$ and also, show the network mask you used for those IP addresses. $(6$ points$)3.$Assuming the interface of A has IP address $192\mathrm{.}168\mathrm{.}1\mathrm{.}2,$ and the adapter for that interface has MAC address aa$-$aa$-$aa$-$aa$-$aa$-$aa; the interface of R$1$ in subnet $1$ has IP address $192\mathrm{.}168\mathrm{.}1\mathrm{.}1,$ and the adapter for that interface has MAC address $11-11-11-11-11-11.$ Now, consider sending an IP datagram from Host A to Host C$.$ Suppose A has an empty ARP table, while R$1$ has the up$-$to$-$dateARP table and routing table respectively. Enumerate all the steps for sending the IP datagram.$(8$ points$)$R$1$R$2$