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range of ip addresses
jamesleecoleman
Member Posts: 1,899 ■■■■■□□□□□
in CCNA & CCENT
Hey!!
I came across this question.
What valid host range is the IP address 172.19.13.52/23 a part of?
The answer is 172.19.12.1 through to 172.19.13.254
I only figured out the first address but I couldn't figure out the second
address. Could someone explain the range to me?
I came across this question.
What valid host range is the IP address 172.19.13.52/23 a part of?
The answer is 172.19.12.1 through to 172.19.13.254
I only figured out the first address but I couldn't figure out the second
address. Could someone explain the range to me?
Booya!!
WIP : | CISSP [2018] | CISA [2018] | CAPM [2018] | eCPPT [2018] | CRISC [2019] | TORFL (TRKI) B1 | Learning: | Russian | Farsi |
*****You can fail a test a bunch of times but what matters is that if you fail to give up or not*****
WIP : | CISSP [2018] | CISA [2018] | CAPM [2018] | eCPPT [2018] | CRISC [2019] | TORFL (TRKI) B1 | Learning: | Russian | Farsi |
*****You can fail a test a bunch of times but what matters is that if you fail to give up or not*****
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Highspade
Member Posts: 29 ■□□□□□□□□□
Next subnet is 172.19.14.0 with a range of 172.19.14.1 - 172.19.15.254 -
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luke_bibby
Member Posts: 162
Figure out the dotted decimal subnet mask for a /23 network:
/23 = 255.255.254.0
The 'interesting' octet is the 3rd one in the subnet mask, as it is the only one which is neither a 0 or a 255.
Calculate the magic number (which is given by 256 - the subnet mask's interesting octet):
m = 256 - 254 = 2
From the magic number, you now know that the subnets jump in 2's, so:
First subnet = 172.19.0.0 - 172.19.1.255
Second subnet = 172.19.2.0 - 172.19.3.255
....
Seventh subnet = 172.19.12.0 - 172.19.13.255
Eighth subnet = 172.19.14.0 - 172.19.15.255
The first and last IP address in a subnet is unusable as the first IP is the subnet number and the last IP is the broadcast number. Therefore, to answer your question, the valid host range for the subnet mask which the IP address 172.19.13.52 belongs to is 172.19.12.1 - 172.19.13.254 -
Optionsjamesleecoleman
Member Posts: 1,899 ■■■■■□□□□□
Thanks for the explaination luke bibby. Would this also work for
What valid host range is the IP address 172.30.83.160 255.255.248.0 a part of?
Answer: 172.30.80.1 through to 172.30.87.254
as well??? I'm getting the magic number of '8' but I would go over the range.Booya!!
WIP : | CISSP [2018] | CISA [2018] | CAPM [2018] | eCPPT [2018] | CRISC [2019] | TORFL (TRKI) B1 | Learning: | Russian | Farsi |
*****You can fail a test a bunch of times but what matters is that if you fail to give up or not***** -
OptionsM4verick
Member Posts: 86 ■■□□□□□□□□
jamesleecoleman wrote: »Thanks for the explaination luke bibby. Would this also work for
What valid host range is the IP address 172.30.83.160 255.255.248.0 a part of?
Answer: 172.30.80.1 through to 172.30.87.254
as well??? I'm getting the magic number of '8' but I would go over the range.
8 is correct. Remember to start at 0, and include that first subnet when counting.
Like, 172.30.80.1/21 doesn't end at 172.30.88.254.
You'd count 80, 81, 82, 83, 84, 85, 86, 87. You're done there.
172.30.0.1 - 172.30.7.254
172.30.8.1 - 172.30.15.254
...
172.30.72.1 - 172.30.79.254
172.30.80.1 - 172.30.87.254Isn't it funny how after you have the certifications, you don't care about sharing them as much? -
Optionscaptobvious
Member Posts: 648
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Optionsjamesleecoleman
Member Posts: 1,899 ■■■■■□□□□□
Thanks M4verick and captobvious!! I think I understand it. I'll post back if I have any more trouble.Booya!!
WIP : | CISSP [2018] | CISA [2018] | CAPM [2018] | eCPPT [2018] | CRISC [2019] | TORFL (TRKI) B1 | Learning: | Russian | Farsi |
*****You can fail a test a bunch of times but what matters is that if you fail to give up or not*****
