One of the key features of OSPF routing protocol is route summarization. Why route summarization is

so important in routed network? Suppose there are $6$ subnets $(192\mathrm{.}168\mathrm{.}0\mathrm{.}0/24,192\mathrm{.}168\mathrm{.}1\mathrm{.}0/24,192\mathrm{.}168\mathrm{.}2\mathrm{.}0/24,192\mathrm{.}168\mathrm{.}3\mathrm{.}0/24,192\mathrm{.}168\mathrm{.}4\mathrm{.}0/24,192\mathrm{.}168\mathrm{.}5\mathrm{.}0/24)$ connected in OSPF area $1$ and are to be advertised by ABR router in area $0,$ what will be the summary route that should be advertised instead of advertising all $6$ subnets?