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which one is the right answer and why?
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the range is 192.0.2.0 to 192.0.3.255 so can't we use 192.10.2.255 as a valid ip.<br />
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192.0.3.255 is the broadcast address
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192.0.2.255 is a valid address on the 192.0.2.0/23 network.
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Yes agree 100%. <br />
But in this context its the correct answer...since 'technically' its a valid ip address.
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For the network 192.0.2.0/23, which option is a valid IP address that can be assigned to host?<br />
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I am very confused with this question, can you please explain me in easy way?
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For the network 192.0.2.0/23, which option is a valid IP address that can be assigned to host?

I am very confused with this question, can you please explain me in easy way?

yes. 

192.0.2.0

192.0.2.255

192.0.3.255

192.0.4.0

the range is 192.0.2.0 to 192.0.3.255 so can&#39;t we use 192.10.2.255 as a valid ip.

192.0.3.255 is the broadcast address

192.0.2.255 is a valid address on the 192.0.2.0/23 network.

Yes agree 100%. 
But in this context its the correct answer...since &#39;technically&#39; its a valid ip address.

subnet question

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.

Routers

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

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.