3. You will now configure the IP addresses and subnet masks on all the PCs and routers (note that you cannot and do not need to configure the switch). Note the subnets listed in the Page 1 picture. Please configure the IP addressing as follows (don't forget to enable the interfaces you configure with no shut): a. On the fOV1 interfaces of all three routers, configure them to use the first usable IP address in their respective submets (e.g., on Routerl f0/1, use 192.168.1.1). Don't forget to use the 255 295.255_0 subnet mask. b. On the f0/0 interfaces of all three routers, configure the following IP addresses and subnet masks: i. Router1: 192.1680.1 255.255.255.0 ii. Router2: 192.168 0.2 255.255 255.0 iii. MainRouter: 192.168.0.254 255.255.255.0 c. On the PCs, configure them to use the last usable IP address in their respective subnets (e.g., 10.0.0.254/24 for OuterPC). Make sure you also configure a default gateway for the PCs (this will be the f0/1 IP addresses on the routers ). As a review from Lab 5, you enter this address after the IP address and CIDR subnet mask. For example