What is what information is computer 1 looking at in the arp table on router y?

Computer 1 is likely looking at the Address Resolution Protocol (ARP) table on Router Y. The ARP table is used to map IP addresses to MAC addresses on a network. It helps devices determine the MAC address of another device on the network when only the IP address is known.

In the ARP table, Computer 1 would be able to see the IP addresses and corresponding MAC addresses of other devices on the network that Router Y has communicated with. This information is used to facilitate communication between devices on the network.

Computer 1 would be looking at this information to help troubleshoot network connectivity issues, identify devices on the network, and ensure the proper mapping of IP addresses to MAC addresses for communication.