I read in the lab instructions that the task is to discover the live host machines and to primarily focus on the subnet 255.255.240.0 (CIDR 20). So the first thing i did was view my ip configuration and it was 10.0.17.61 and the gateway was 10.0.16.1
I opened zemap and used the following command nmap -sn 10.0.16.0/20
but in the solutions it was instructed to scan 10.0.17.0/20 (i thought we have to calculate the subnet since 10.0.16.1 is the gateway, isnt the network address supposed to be 10.0.16.0/20)