For this lab you will need a DHCP server, if you have followed the lab design, it should be easy enough to add this to the pdc.
Once done create a scope for 172.16.50.10-20 with 172.16.50.1 as the gateway
Also you will need a vm configured for dynamic ip assignment.
1. Add Logical switch
2. Add interface on Perimeter Gateway,
connect to new logical switch
add ip for LIF
3. Enable DHCP on Perimeter Gateway and add DHCP Server IP
4. Add DHCP Relay Agent on Perimeter Gateway
5. Publish the changes
6. Create a vm with dhcp ip address and add to dhcp virtual wire
run ifdown and ifup and verify if collects dhcp address