Subnetting Speed Practice at CCENTSkills
By certskills
Just a heads up, for those of you who are past the ICND1 exam and CCENT. I just posted a new subnetting practice question at the CCENTSkills blog, and answers. Of course, subnetting matters a lot on both ICND1 and ICND2, so just wanted to make sure you saw it if interested. That’s it!
Wendell
By certskills
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Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two)
A. 113.10.4.0
B. 186.54.3.0
C. 175.33.3.255
D. 26.35.2.255
E. 17.35.36.0
subnet increment is 2, subnet mask is 23
so, host range will be from 2.1 to 3.254, and … so, the answer is B and D.
why do we have to start at 2 why cant the range be 0.1 1.255 ? is the question assuming no ip subnet zero is being used?
Hi Patrick,
Uh, I was a little confused. “why do we have to start at 2…?” I don’t see anything in the question that says anything about having to start at 2. So my answer is a guess at what you meant (sorry about that).
Anyway, the answers do not list a zero subnet. The answers could have, they just don’t. The question doesn’t happen to state anything at all about requirements related to zero subnets. It doesn’t imply anything about having to start at 2, or avoid zero subnets, etc.
But if one existed, with a /23 mask, the 3rd and 4th octets would have the values you listed.
Hope this helps…
Wendell
Magic number is 2
So A (113.10.4.0) would be a subnet ID (multiple of magic number in 3d octet with 0 in 4th)
B (186.54.3.0) could be a host (subnet ID 186.54.2.0, host addresses from 186.54.2.1 – 186.54.3.254, broadcast 186.54.3.255)
C would be a broadcast address
D could be a host
E would be a subnet ID (multiple of magic number in 3d octet with a 0 in the 4th octet)
I’d say B and D. Hope my logic is sound.
I get your comment now.
I agree with your logic.
I’m not a fan of the question. I respect that it’s difficult to avoid giving away the answer, but I think it’s too obscure. I’d prefer one that lists a specific subnet, EG, which are usable addresses in the same subnet as address/mask 113.10.4.5/23? It exercises the same logic.