how to make client computer receiver dynamic ip adress from server after configuring dhcp scope for ip adress range $172\mathrm{.}20\mathrm{.}10\mathrm{.}1$ to $172\mathrm{.}20\mathrm{.}10\mathrm{.}254,?$

when i command ipconfig my client computer show the ip adress $169\mathrm{.}254\mathrm{.}161\mathrm{.}198$ instead of showing ip adress within range set by dhcp scope $...$