I need help with number 3

Describe the hidden node problem in wireless LANs, and the medium access protocol used to access a Wi-Fi network. Let's assume that you have the following network architecture: Computer 1, has IP address IP1 and MAC address MAC1. It sends a packet to computer 2 with IP2 and MAC2. The computer is located in a different subnet, so the packet as crosses a gateway router, which has two interfaces (IP3, MAC3 and IP4, MAC4), as shown in figure. Describe the addressing used (IP and MAC addresses, source and destination addresses), when a) the packet is in the subnet 1 b) the packet is in the subnet 2 If your subnet mask is 255.255.252.0. a. How many devices/hosts can be supported on that subnet