PDF is the ratio between the numbers of packets originated
by the application layer sources and the number of packets
received by the sinks at the final destination. It will describe
the loss rate that will be seen by the transport protocols,
which in turn affects the maximum throughput that the
network can support. In terms of packet delivery ratio, DSR
performs well when the number of nodes is less as the load
will be less. However its performance declines with
increased number of nodes due to more traffic in the
network. The performance of DSDV is better with more
number of nodes than in comparison with the other two
protocols. The performance of AODV is consistently
uniform.