I need to figure out some way to allow my computer to get assigned a specific IP address. This IP is already taken by some other device on the network. The network is laid out with Source > Firewall/Filter > Switch > Switch > Computer. I have done some research and found out how to scan for IP addresses, but, being the novice that I am, I have no idea how to identify what device is using the desired IP address and I have no way to get DHCP to reassign a new one for it so that my computer can have the IP instead. Basically, I want a static IP in the midst of all the other DHCP IPs. I have tried to simply change my computer's IP, and it results in a loss of internet access until I re-enable DHCP. The DHCP Server is dynamically allocated. I am not the system administrator, but I work for someone who is, and I have the admin passwords.
Apologies if any of the given information is hard to understand or even completely incorrect. I am working off of the limited existing knowledge that I have, and that's not a lot. I will edit my question if any further information is needed.
arp -a
command to find out who (hardware address) has what ip address (logical address). Also you should specify your OS in the tags as it might be usefull for your case/question down the road.