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Thanks guys I thought maybe it was a trick question, but these explanations make more sense to me.
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Thanks guys I thought maybe it was a trick question, but these explanations make more sense to me.

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I'm working on learning how to manually solve some issues related to subnetting. <br />
A practice question I came across states:<br />
<br />

<blockquote>
If you have a router in the network you're connected to and the Default Gateway is set to 192.168.1.1 and the subnet mask is 255.255.255.0, which of the following are usable IP address on that network?<br />
<br />
1) 192.168.1.1<br />
2) 192.168.1.300<br />
3) 192.168.1.30<br />
4) 192.168.2.10
</blockquote>
<br />
Just looking at it, I can tell it's not 1), because that'd be a conflict, right? <br />
2) would be too high of a 4th octet<br />
4) is not the right subnet? <br />
<br />
What would be the formula to workout the answer? Or is there not one?<br />
<br />
I do not know what the MagicNumber would be in this case.
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I'm working on learning how to manually solve some issues related to subnetting. 
A practice question I came across states:

If you have a router in the network you're connected to and the Default Gateway is set to 192.168.1.1 and the subnet mask is 255.255.255.0, which of the following are usable IP address on that network?

1) 192.168.1.1
2) 192.168.1.300
3) 192.168.1.30
4) 192.168.2.10

Just looking at it, I can tell it's not 1), because that'd be a conflict, right? 
2) would be too high of a 4th octet
4) is not the right subnet? 

What would be the formula to workout the answer? Or is there not one?

I do not know what the MagicNumber would be in this case.

How to find a Usable IP address with just a Default Gateway and Subnet mask?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

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