What is the Ans of question one?
255.255.255.0 is a network mask, not a network. Try looking at the router network config. Routers connect networks, so both networks have to be represented there.
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I tried a lot. I searched in the router section but couldn’t find any information. After that, I looked for answer hints. From those, I found a clue—that’s why I wrote ‘mask’ there. Right now what should I do?
Go back to the Core Concepts. Understand what part of the IP address is the network. Then look in the router config and you will find the two networks. Each interface will reside in one of the networks (as that’s what routers do).
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Do you remember the difference between network and host?
And as JosephWhite explained, it is the Router which connects the two networks in this question. So you gotta check the Router.
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Thank you so much! I solved it. 
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Great job working through the problem and persevering!!