when i assigned two different class ip add. on two different PCs i.e. 192.168.10.1\24 and 10.0.0.1\8 resp. they started pinging each other as i repeated the same ip add. on their default gateways (i.e. 192.168.10.1 and 10.0.0.1 resp.), what can be a probable reason for this act?