A network uses a subnet mask of 255.255.255.0 has a computer on the network with an IP address of 120.12.12.3 Will the IP address 120.12.10.3 be on the network Explain your answer?

Answer 1

This is vague, but I'll try.

If a computer is on a network, and it's IP address is 120.12.12.3, with a subnet mask of 255.255.255.0, then that means that all computers/devices/printers that have IP addresses in the range of 120.12.12.1-120.12.12.254 are on the same network, and would be directly reachable without the need of a router. For instance, If there was a computer with IP 120.12.12.4, they could talk directly. But, if a computer with IP 120.12.13.15 wanted to communicate, it would first have to communicate to and through a router.

Subnet masks tell us what part of the IP address is the network portion and which is the host. A 255 in the first three octets tells us that the first three bytes/octets/portions of the IP address needs to be examined for a match. If they match then the computers can directly communicate, no match? They must traverse a router.

Answer 2

If you apply the subnet mask to both IP addresses, you can see both are different.

120.12.12.3

255.255.255.0

______________

120.12.12.0

120.12.10.3

255.255.255.0

______________

120.12.10.0

TLDR: No

Answer 3

No. With subnetting the first three octets MUST be the same.

Answer 4

The question cannot be answered merely from a subnet mask.

Answer 5

No.