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Solve : subnetting? |
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Answer» In a network book I have there is an example of subnetting a class C IPv4 address. They take a subnet mask of 255.255.255.0 and borrow 2 bits from the host portion of the subnet mask, like this: ALTHOUGH many will disagree, I think there are four usable subnets: 192.168.4.0 /26 192.168.4.64 /26 192.168.4.128/26 192.168.4.192/26 By convention 0.0.0.0/26 would be invalid as well as 255.255.255.192/26. I had this unresolved argument with my instructor. The network address may not be zero or all ones, but I don't believe that means the network address portion in the last octet of this example can't be all zeros or all ones. Too lazy to look up an authoritative source right now. Someday maybe... Quote from: blockHEAD on August 01, 2009, 03:51:24 AM I'm confused. Given that the original subnet mask is class C, shouldn't the new subnet mask be 255.255.255.192 What am I missing here? I'm thinking that the subnet mask given to the four computers is a typo. You're correct. The new subnet mask should be "255.255.255.192". Quote from: blockHEAD on August 01, 2009, 03:51:24 AM Also, the diagram is totally confusing because the two subnets addresses are not labeled anywhere... It looks like fours computer with random IP addresses.. Network "192.168.4.64" contains hosts "192.168.4.67" and "192.168.4.101". Network "192.168.4.128" contains hosts "192.168.4.130" and "192.168.4.187" Quote from: dahlarbear on August 02, 2009, 05:03:27 AM
That's what I figured However, being a newbie in networking it's difficult to TELL the difference between a good and poor diagram...But this has been a learning experience. I think the author could have done a better job on the diagram.....I spent hours trying to figure out if the subnet mask was incorrect, comparing it with other sources. The author should have also put routers in the diagram to make the subnets apparent. I wonder how THINGS like that make it past editors.. When I was studying for the A+ exam, I used a pretty crappy book....so many typos and FALSE info...I had to email the author several times for clarification As far as four new subnets being available instead of two, don't know I'll worry about it later when I get all the more important stuff down Your comments have been helpful....thanks |
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