Maximize subnets or hosts?
xenodamus
Member Posts: 758
in CCNA & CCENT
As a general rule, when you have questions that ask for a mask that gives you X networks and X hosts, which should you maximize? I just got this question from subnettingquestions.com this morning:
You are designing a subnet mask for the 172.23.0.0 network. You want 70 subnets with up to 300 hosts per subnet. What subnet mask should you use?
Answer: 255.255.254.0
My first instinct was to borrow 1 bit to give you the 70 subnets. Was the "up to 300 hosts" supposed to tip me off to the fact that I should maximize for subnets? I have subnettingquestions.com set as my home page btw. If you make yourself answer a question every time you open IE, you get in alot of practice
You are designing a subnet mask for the 172.23.0.0 network. You want 70 subnets with up to 300 hosts per subnet. What subnet mask should you use?
Answer: 255.255.254.0
My first instinct was to borrow 1 bit to give you the 70 subnets. Was the "up to 300 hosts" supposed to tip me off to the fact that I should maximize for subnets? I have subnettingquestions.com set as my home page btw. If you make yourself answer a question every time you open IE, you get in alot of practice
CISSP | CCNA:R&S/Security | MCSA 2003 | A+ S+ | VCP6-DTM | CCA-V CCP-V
Comments
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jamesleecoleman
Member Posts: 1,899 ■■■■■□□□□□
I always go for the X amount of hosts first. When I find that, then I usually have my answer.Booya!!
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DevilWAH
Member Posts: 2,997 ■■■■■■■■□□
As a general rule, when you have questions that ask for a mask that gives you X networks and X hosts, which should you maximize? I just got this question from subnettingquestions.com this morning:
You are designing a subnet mask for the 172.23.0.0 network. You want 70 subnets with up to 300 hosts per subnet. What subnet mask should you use?
Answer: 255.255.254.0
My first instinct was to borrow 1 bit to give you the 70 subnets. Was the "up to 300 hosts" supposed to tip me off to the fact that I should maximize for subnets? I have subnettingquestions.com set as my home page btw. If you make yourself answer a question every time you open IE, you get in alot of practice
that question is saying ensure each subnet can support up to 300 hosts.
so you want to have 70+ subnets each with 300+ hosts. This is an "and" situation.
And nice idea to set it as home page - If you can't explain it simply, you don't understand it well enough. Albert Einstein
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blackninja
Member Posts: 385
"You are designing a subnet mask for the 172.23.0.0 network. You want 70 subnets with up to 300 hosts per subnet. What subnet mask should you use?"
The only answer to that question is: 255.255.254.0
#of subnets----# of hosts
255.255.254.0 ----128
510
255.255.252.0 ----64
1022
255.255.248.0 ----32
2046
In questions: Always go for the subnets first, the hosts usually fall right, if the correct number of subnets are picked.
They are always going to ask for a number of networks and hosts that is do-able (is that even a word?).Currently studying:
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Everything. Twice
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xenodamus
Member Posts: 758
Crap...I think this was just a brainfart moment. Borrowing 1 bit makes no sense. Must have been too early for subnetting this morning lol. Thanks for the help, though.CISSP | CCNA:R&S/Security | MCSA 2003 | A+ S+ | VCP6-DTM | CCA-V CCP-V