The internal representation of the network and network nodes is shown in the

following diagram.Step $1$: Download the pure$-$text ns$-3$ trace file Assignment$-1($TR $42$ KB$)$ Download Assignment$-1($TR $42$ KB$).$ This file is a result of an ns$-3$ simulation study of a network of four nodes: n$0,$ n$1,$ n$2,$ and n$3.$ A part of the file's screenshot is below:

File Edit View

$0\mathrm{.}002928/$NodeList$/1/$DeviceList$/1/$$ns$3$::PointToPointNetDevice$/$TxQueue$/$Enqueue ns$3$::PppHeader $($Point$-$to$-$Point Protocol: IP $(0$x$0021))$ ns$3$::Ipv$4$Header $($tos $0$x$0$ DScP Default

r $0\mathrm{.}003856/$NodeList$/1/$DeviceList$/0/$$ns$3$::PointToPointNetDevice$/$MacRx ns$3$::PppHeader $($Point$-$to$-$Point Protocol: IP $(0$x$0021))$ ns$3$::Ipv$4$Header $($tos $0$x$0$ DSCP Default ECN Not$-$ECT ttl $64$ id $0$ protocol $6$ offs

$56192\mathrm{.}168\mathrm{.}1\mathrm{.}1>192\mathrm{.}168\mathrm{.}3\mathrm{.}2)$ ns$3$::TcpHeader $(49154>9[$SYN$]$ Seq$=0$ Ack$=0$ Win$=65535$ ns$3$::TcpOptionTS$(0$;$0)$ ns$3$::TcpOptionWinScale$(2)$ ns$3$::Tcp$0$ptionSackPermitted$([$sack$\_$perm$])$ ns$3$::TcpOptionEnd$($EOL$))$

$0\mathrm{.}003856/$NodeList$/1/$DeviceList$/2/$$ns$3$::PointToPointNetDevice$/$TxQueue$/$Enqueue ns$3$::PppHeader $($Point$-$to$-$Point Protocol: IP $(0$x$0021))$ ns$3$::Ipv$4$Header $($tos $0$x$0$ DSCP Default ECN Not$-$ECT ttl $63$ id

r $0\mathrm{.}005856/$NodeList$/2/$DeviceList$/0/$$ns$3$::PointToPointNetDevice$/$MacRx ns$3$::PppHeader $($Point$-$to$-$Point Protocol: IP $(0$x$0021))$ ns$3$::Ipv$4$Header $($tos $0$x$0$ DSCP Default ECN Not$-$ECT ttl $63$ id $0$ protocol $6$ offs

$56192\mathrm{.}168\mathrm{.}1\mathrm{.}1>192\mathrm{.}168\mathrm{.}2\mathrm{.}2)$ ns$3$::TcpHeader $(49153>9[$SYN$]$ Seq$=0$ Ack$=0$ Win$=65535$ ns$3$::TcpOptionTS$(0$;$0)$ ns$3$::TcpOptionWinScale$(2)$ ns$3$::TcpOptionSackPermitted$([$sack$\_$perm$])$ ns$3$::TcpOptionEnd$($EOL$))$

$0\mathrm{.}006784/$NodeList$/3/$DeviceList$/0/$$ns$3$:$(49154>9[$SYN$]$ Seq$=0$ Ack$=0$ Win$=65535$ ns$3$::TcpOptionTS$(0$;$0)$ ns$3$::Tcp$0$ptionWinScale$(2)$ ns$3$::Tcp$0$ptionSackPermitted$([$sack$\_$perm$])$ ns$3$::Tcp$0$ptionEnd$($EOL$))$

$0\mathrm{.}008784/$NodeList$/1/$DeviceList$/0/$$ns$3.$:ScpHer $(9>49153[$SYN$|$ACK$]$ Seq$=0$ Ack$=1$ Win$=65535$ ns$3$::Tcp$0$ptionTS$(5$;$0)$ ns$3$::TcpOptionWinScale$(2)$ ns$3$::Tcp$0$ptionSackPermitted$([$sack$\_$perm$])$ ns$3$::Tcp$0$ptionEnd$($EOL$))$

$0\mathrm{.}011712/$NodeList$/0/$DeviceList$/0/$$ns$3$::PointToPointNetDevice$/$TxQueue$/$Dequeue ns$3$::PppHeader $($Point$-$to$-$Point Protocol: IP $(0$x$0021))$ ns$3$::I

Step $2$: Choose a source node $($n$0)$ and a sink node $($n$3),$ then calculate the following performance metrics:

$$ Round trip delay over time

$$ Minimum round trip delay

$$ Average round trip delay

$$ Maximum round trip delay

Note: For computational efficiency, you must use Linux utility 'grep' or 'awk' $($or both$)$ for your calculation. You are required to document the steps of your Linux commands and calculation. You should present the performance over time using a plot.

More information on the network

The internal representation of the network and network nodes is shown in the following diagram.

Node n$0$ is a source node. Nodes n$2$ and n$3$ are sink nodes. Node n$1$ is a router.

The network traffic flows are as follows:

$$ n$0=>$ n$2$ TCP segments $($payload size $=50$ bytes$)$

$$ n$0=>$ n$3$ TCP segments $($payload size $=50$ bytes$)$

The IP addresses for the four nodes in the network are configured as follows:

$$ n$0$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}1$

$$ n$1$: $192\mathrm{.}168\mathrm{.}1\mathrm{.}2$ and $192\mathrm{.}168\mathrm{.}2\mathrm{.}1$ and $192\mathrm{.}168\mathrm{.}3\mathrm{.}1$

$$ n$2$: $192\mathrm{.}168\mathrm{.}2\mathrm{.}2$

$$ n$3$: $192\mathrm{.}168\mathrm{.}3\mathrm{.}2$