Networking - Subnetting - Discussion

Discussion :: Subnetting - Subnetting (Q.No.19)

19. 

Using the illustration from the previous question, what would be the IP address of S0 if you were using the first subnet? The network ID is 192.168.10.0/28 and you need to use the last available IP address in the range. Again, the zero subnet should not be considered valid for this question.

[A]. 192.168.10.24
[B]. 192.168.10.62
[C]. 192.168.10.30
[D]. 192.168.10.127

Answer: Option C

Explanation:

A /28 is a 255.255.255.240 mask. The first subnet is 16 (remember that the question stated not to use subnet zero) and the next subnet is 32, so our broadcast address is 31. This makes our host range 17-30. 30 is the last valid host.

Gajulapalli Naveen said: (Dec 1, 2015)  
Option B also will be correct answer.

192.168.10.62 is also not a zero subnet.

Patricio said: (Jan 9, 2016)  
What about option A, this value is between 17-30?

Mehedi Hasan said: (Feb 24, 2016)  
The question was last available IP address in the IP range.

So I think that will be, 192.168.10.62 because that is last valid IP address for this scenario and the first one is 192.168.10.30.

Dibyaranjan Moharana said: (Jun 14, 2016)  
Option A) 192.168.10.24 is also the correct answer.

Sambhaji said: (May 13, 2017)  
What is the concept of subnet zero?

Viren Narang said: (May 25, 2018)  
I think Option B is also correct.

Krishna said: (Oct 23, 2018)  
192.168.10.0,16,32.

C is the correct answer.

Khurram said: (Jan 28, 2019)  
Why B is incorrect?

10.62 is the last usable host in the subnet 10.48.

Luloth said: (Aug 14, 2020)  
@Sambhaji.

If a network address is subnetted, the first subnet obtained after subnetting the network address is called subnet zero.

Lexi said: (Aug 25, 2020)  
B isn't correct because you have to use the first subnet and not the third subnet which would be 48-64 (usable 49-62). Zero subnet is not to be used in this question; which is irrelevant information as there are no options that include valid host addresses.

Saravanan said: (Feb 17, 2021)  
The answer is C because,

1) The Zero Subnet shouldn't be considered. What is that?

Basically its the first subnet obtained when subnetting the network address (192.168.10.0) OR also known as subnetted ip that has 0's in the subnet portion of the address.

2) We know that the ip address increment's in 16. So consider 192.168.10.16 as the first viable subnet instead of 192.168.10.0. The following subnet is 192.168.10.30. So from here we can calculate the last host for subnet 192.168.10.16 by minus 2 from 192.168.10.32 cause 192.168.10.30 is broadcast and below then that is the last host of 192.168.10.16.

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