Exercise $4.$ Fill in the Multicast Forwarding Tables listed for the domain depicted in the diagram below. Use the following messages to populate the tables$-$show the results of each message, crossing out any entries that would be overwritten. Show all intermediate entries in the table, i$.$e$.,$ populate the tables based on what happens as each message is sent. Add rows to the tables as necessary.

Messages

$1.$ R$4$ joins multicast group $230\mathrm{.}15\mathrm{.}45\mathrm{.}116$

$2.$ R$1$ joins multicast group $230\mathrm{.}15\mathrm{.}45\mathrm{.}116$

$3.$ Host $\backslash ($ A $\backslash )$ sends to multicast group $230\mathrm{.}15\mathrm{.}45\mathrm{.}116$

$4.$ R$4$ sends a source$-$specific join to R$5,$ which joins the source$-$specific tree

$5.$ R$1$ sends a source$-$specific join to R$5,$ which joins the source$-$specific tree RP Multicast Forwarding Table

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|$c$|\}$

$\backslash$hline $\backslash$begin$\{$tabular$\}\{$c$\}$

MSG $\backslash \backslash$

$\backslash$#

$\backslash$end$\{$tabular$\}$ & Source IPv$4$ address & $\backslash$begin$\{$tabular$\}\{$c$\}$

Multicast group $\backslash \backslash$

IPv$4$ address

$\backslash$end$\{$tabular$\}$ & Incoming Interface & Outgoing Interfaces $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$

R$1$ Multicast Forwarding Table

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|$c$|\}$

$\backslash$hline $\backslash$begin$\{$tabular$\}\{$c$\}$

MSG $\backslash \backslash$

$\backslash (\backslash$# $\backslash )$

$\backslash$end$\{$tabular$\}$ & Source IPv$4$ address & $\backslash$begin$\{$tabular$\}\{$c$\}$

Multicast group $\backslash \backslash$

IPv$4$ address

$\backslash$end$\{$tabular$\}$ & Incoming Interface & Outgoing Interfaces $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline & & & & $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$ R$2$ Multicast Forwarding Table

R$3$ Multicast Forwarding Table

R$4$ Multicast Forwarding Table

R$5$ Multicast Forwarding Table

R$6$ Multicast Forwarding Table