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Home > Archive > CCNA > November 2000 > Subnetting Q
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| IP host address 172.1.2.160 and a subnet mask of 255.255.255.192
host range and Broadcast address? | |
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| Treat it as a class C address for purposes of subnetting.
256-192=64
Subnet addresses: 64, 128, 192
The subnet is: 128
Broadcast address: 191
Host range: 172.16.2.129-172.16.2.190
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B.S. in Telecommunications Management, Network+, CCNA - Still can't type, still no job! | |
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| How did you come up with the "192" in the "256-192" problem?
Thanks. | |
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| from the subnet mask  | |
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| 256-192=64
Subnet addresses: 64, 128
This part is right. But you didn't break down the subnets and broadcasts.
64 Network Address
65 First user(host address)
126 Last user(host address)
127 Broadcast address
This is Class C
[This message has been edited by Mix (edited 11-29-2000).] | |
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| Cont. from above post.
128 Network address
129 First user(host address)
190 Last user(host address)
191 Broadcast address
This is the proper way of breaking down a Class C structure. | |
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| Mix, I'm confused. I don't see where rore is wrong. Broadcast=191 first subnet=128 first host=129 last host=190. Same thing you came up with I thought.
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| quote:
Originally posted by OKLANman:
Mix, I'm confused. I don't see where rore is wrong. Broadcast=191 first subnet=128 first host=129 last host=190. Same thing you came up with I thought.
Sorry bout that 3rd subnet=128 | |
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| uploaded a Word Doc format version of my subnetting guide for easy print out and download at www.mcsefreak.com/subnetting.htm
Hope this helps
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Freak, MA, M.Ed., Net+,I-Net+, MCP+I, MCSE, MCT
http://www.mcsefreak.com
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| This is a class B network with a class B subnet. Probably, for the purposes of the the test, you would handle this as if it were a class C network. It's also an example of where you can have a 0 or value equal to the last octet in the subnet mask but it depends on what is in the third and fourth octet. As long as all the subnet bits on the third octet are not all off, then subnet 0 in the fourth octet is valid. Also, as long as all the subnet bits in the third octet are not all on, 192 is valid in the fourth octet as a subnet. For this example, you would have subnets:
0.64 0.128 0.192 1.0 1.64 1.128 1.192 etc.
For a class C subnet, you wouldn't be able to use 0 or 192. |
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