Answer:
The answer is since both ip addresses are not within the same subnet, only router can be used for the two computers to communicate together.
Step-by-step explanation:
From the statements in the question, since the two ip addresses are not on same subnet value i.e 172.31.210.10/24 and 172.31.209.122/24 then both computers cannot communicate except a router is used for network connections for the two different subnets as they are not on the same network.
Step-by-step explanation: