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Home > Archive > alt.certification.network-plus > November 2002 > Can't wrap my little head around this
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Can't wrap my little head around this
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| Tessier 2002-10-24, 9:25 am |
| Is it just me or is the hardest part of studying for the Network+ address
figuring out subnet masking ?? I'm really trying here but I think I'm going
to have to take a few more hours to sit down and figure it out.
Pat
A+
| |
| Claudia Schnell 2002-10-24, 10:25 am |
| You're not the only one. I was reading that chapter all afternoon yesterday
and I still have problems
understanding it.
Claudia.
"Tessier" <onestopdepot@sympatico.ca> wrote in message
news:fNSt9.11307$Kf.1261951@news20.bellglobal.com...
> Is it just me or is the hardest part of studying for the Network+ address
> figuring out subnet masking ?? I'm really trying here but I think I'm
going
> to have to take a few more hours to sit down and figure it out.
>
> Pat
> A+
>
>
| |
|
| From what I understand all you need to know about subnet masking is the
different classes (a, b, c) subnets. Know that CIDR is (what allows more
subnets to be created) and know how a network host is calculated with a
subnet mask. Don't worry about having to figure out actual subnet addresses
like 255.255.240.0
There is lots of great info (way past net +) at www.learntosubnet.com
Matt
"Tessier" <onestopdepot@sympatico.ca> wrote in message
news:fNSt9.11307$Kf.1261951@news20.bellglobal.com...
> Is it just me or is the hardest part of studying for the Network+ address
> figuring out subnet masking ?? I'm really trying here but I think I'm
going
> to have to take a few more hours to sit down and figure it out.
>
> Pat
> A+
>
>
| |
| Claudia Schnell 2002-10-24, 11:24 am |
| Thanks Matt
Excellent Webpage
"MDC" <spam@kc.rr.com> wrote in message
news:ap92ts$s6b6i$1@ID-151603.news.dfncis.de...
> From what I understand all you need to know about subnet masking is the
> different classes (a, b, c) subnets. Know that CIDR is (what allows more
> subnets to be created) and know how a network host is calculated with a
> subnet mask. Don't worry about having to figure out actual subnet
addresses
> like 255.255.240.0
>
> There is lots of great info (way past net +) at www.learntosubnet.com
>
> Matt
>
>
> "Tessier" <onestopdepot@sympatico.ca> wrote in message
> news:fNSt9.11307$Kf.1261951@news20.bellglobal.com...
> > Is it just me or is the hardest part of studying for the Network+
address
> > figuring out subnet masking ?? I'm really trying here but I think I'm
> going
> > to have to take a few more hours to sit down and figure it out.
> >
> > Pat
> > A+
> >
> >
>
>
| |
| Charles M. Kozierok 2002-10-24, 12:24 pm |
| In article <fNSt9.11307$Kf.1261951@news20.bellglobal.com>,
Tessier <onestopdepot@sympatico.ca> wrote:
} Is it just me or is the hardest part of studying for the Network+ address
} figuring out subnet masking ?? I'm really trying here but I think I'm going
} to have to take a few more hours to sit down and figure it out.
What are you finding confusing?
Here's subnetting in very simple terms.
You start with a Class A, Class B or Class C network. The 32-bit
IP address is split into 8 bits for the network ID and 24 for the
host ID in a Class A; for Class B it is 16 and 16, and for Class C
it is 24 and 8.
Now, with subnetting, we take this two-level structure and change
it into a three-level structure. This is done by taking some of the
bits from the host ID and using them for the subnet ID. So for example,
in a Class C network we could take 3 bits from the 8 host ID bits
and use them for the subnet ID. This allows us to define 2^3=8
subnets with a total of 2^5-2=30 hosts per subnet (you subtract
two since all-0 and all-1 values are reserved).
So what's the subnet mask? It is a 32-bit number where a "1" is
placed for each bit that corresponds to the network ID or subnet ID.
For a Class C, the first 24 bits are the network ID, so they are 1s.
Then, since we devoted 3 bits fo the subnet ID, they are 1s also,
for a total of 27. The remaining 5 bits are 0s.
So the subnet mask is: 11111111 11111111 11111111 11100000.
Converting to decimal, this is 255.255.255.224.
Any specific questions, fire away.
peace,
-*-
charles
| |
| Russ S 2002-10-24, 2:24 pm |
| Hey Pat
Don't worry - it isn't really that difficult.
--
RussS
A+, Net+, MCP W2k
| |
|
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| Slammer 2002-10-24, 5:24 pm |
| This site can help you.
http://www.learntosubnet.com/
--
Slammer
MCSA, CNA, Net+, A+
"Tessier" <onestopdepot@sympatico.ca> wrote in message
news:fNSt9.11307$Kf.1261951@news20.bellglobal.com...
> Is it just me or is the hardest part of studying for the Network+ address
> figuring out subnet masking ?? I'm really trying here but I think I'm
going
> to have to take a few more hours to sit down and figure it out.
>
> Pat
> A+
>
>
| |
| Tessier 2002-10-24, 6:24 pm |
| Thanks Russ,
We'll see here soon gonna set up the exam for next week probably. If I pass
I'll thank ya, if I fail I'll thump ya  j/k
Pat
A+
"Russ S" <noway@nohow.com> wrote in message
news:jIXt9.905$8o1.173587@news.xtra.co.nz...
> Hey Pat
>
> Don't worry - it isn't really that difficult.
>
> --
> RussS
> A+, Net+, MCP W2k
>
>
| |
| Growler 2002-10-24, 10:24 pm |
| "Tessier" <onestopdepot@sympatico.ca> wrote in
news:fNSt9.11307$Kf.1261951@news20.bellglobal.com:
> Is it just me or is the hardest part of studying for the Network+
> address figuring out subnet masking ?? I'm really trying here but I
> think I'm going to have to take a few more hours to sit down and
> figure it out.
>
> Pat
> A+
>
>
got to Freak's link or learntosubnet. I think you'll find subnetting is
so easy that it seems hard. take it one step at a time and suddenly your
there. Think binary. Although I still use a calc LOL
Greg
| |
| steve harris 2002-10-24, 10:24 pm |
| On Thu, 24 Oct 2002 09:42:37 +0000, Tessier wrote:
> Is it just me or is the hardest part of studying for the Network+ address
> figuring out subnet masking ?? I'm really trying here but I think I'm
> going to have to take a few more hours to sit down and figure it out.
>
> Pat
> A+
I've always used binary. No shortcuts or tables to memorize.
| |
| Hashem Ouaida 2002-10-28, 6:24 am |
| Subnetting is a pain in the butt no doubt about it.
But the good news is, the Network+ isnt interested in the ins and outs of IP
addressing. So long as u know as the classes of the Ip addresses are and the
subnet masks.
Its really easy.
123.10.10.2 is an A class address which means the Subnet mask is 255.255.0.0
The hardest part is memorizing which ip address go into which class.
I hope that helps
Cheers
Hashem
A+ Network+
| |
| Charles M. Kozierok 2002-10-28, 8:24 am |
| In article < 3dbd2701$0$23170$afc38c87@news
.optusnet.com.au>,
Hashem Ouaida <ouaida@optushome.com.au> wrote:
} Subnetting is a pain in the butt no doubt about it.
} But the good news is, the Network+ isnt interested in the ins and outs of IP
} addressing. So long as u know as the classes of the Ip addresses are and the
} subnet masks.
} Its really easy.
} 123.10.10.2 is an A class address which means the Subnet mask is 255.255.0.0
} The hardest part is memorizing which ip address go into which class.
The default subnet mask for a class A network is 255.0.0.0. The actual
subnet mask depends on how the network is subnetted.
And of course today the Internet is classless anyway.
peace,
-*-
charles
| |
| Tom MacIntyre 2002-10-28, 3:25 pm |
| On Mon, 28 Oct 2002 13:30:30 +0000 (UTC), ixlu@PCGuide.com (Charles M.
Kozierok) wrote:
>In article < 3dbd2701$0$23170$afc38c87@news
.optusnet.com.au>,
>Hashem Ouaida <ouaida@optushome.com.au> wrote:
>} Subnetting is a pain in the butt no doubt about it.
>} But the good news is, the Network+ isnt interested in the ins and outs of IP
>} addressing. So long as u know as the classes of the Ip addresses are and the
>} subnet masks.
>} Its really easy.
>} 123.10.10.2 is an A class address which means the Subnet mask is 255.255.0.0
>} The hardest part is memorizing which ip address go into which class.
>
>The default subnet mask for a class A network is 255.0.0.0. The actual
>subnet mask depends on how the network is subnetted.
>
>And of course today the Internet is classless anyway.
A double entendre, perhaps? :-)
Tom
>
>peace,
>
>-*-
>charles
| |
| Charles M. Kozierok 2002-10-29, 8:24 am |
| In article < 9s7rruca790cedun6cvk1b5c5eehd6
b931@4ax.com>,
Tom MacIntyre <tom__macintyre@hotmail.com> wrote:
} On Mon, 28 Oct 2002 13:30:30 +0000 (UTC), ixlu@PCGuide.com (Charles M.
} Kozierok) wrote:
} >And of course today the Internet is classless anyway.
}
} A double entendre, perhaps? :-)
Yeah, I guess you're right about that after all.
I still don't get why the original poster never even explained what it
was that he or she (I forget) found confusing about subnetting...
peace,
-*-
charles
| |
| Tessier 2002-10-29, 9:24 am |
| Well the HE found the whole thing confusing but after going back into the
book for the third time and looking at some online tutorials I think I got
the idea down.
Thanks
Pat
A+
"Charles M. Kozierok" <ixlu@PCGuide.com> wrote in message
news:apm3f9$6kf$1@reader1.panix.com...
> In article < 9s7rruca790cedun6cvk1b5c5eehd6
b931@4ax.com>,
> Tom MacIntyre <tom__macintyre@hotmail.com> wrote:
> } On Mon, 28 Oct 2002 13:30:30 +0000 (UTC), ixlu@PCGuide.com (Charles M.
> } Kozierok) wrote:
> } >And of course today the Internet is classless anyway.
> }
> } A double entendre, perhaps? :-)
>
> Yeah, I guess you're right about that after all.
>
> I still don't get why the original poster never even explained what it
> was that he or she (I forget) found confusing about subnetting...
>
> peace,
>
> -*-
> charles
| |
| pseudocyber 2002-10-29, 1:33 pm |
| As has been mentioned, repeatedly, the Network+ exam only tests on your knowledge of IP Address classes, not how to subnet.
So, you have to know the range of
Class A
Class B
Class C
You ought to know about class D and E just in case they throw an odd ball question at you as well. | |
| >Pearl Jam 2002-11-06, 1:24 pm |
| On Thu, 24 Oct 2002 17:02:40 +0000 (UTC), ixlu@PCGuide.com (Charles M.
Kozierok) wrote:
>In article <fNSt9.11307$Kf.1261951@news20.bellglobal.com>,
>Tessier <onestopdepot@sympatico.ca> wrote:
>} Is it just me or is the hardest part of studying for the Network+ address
>} figuring out subnet masking ?? I'm really trying here but I think I'm going
>} to have to take a few more hours to sit down and figure it out.
>
>What are you finding confusing?
>
>Here's subnetting in very simple terms.
>
>You start with a Class A, Class B or Class C network. The 32-bit
>IP address is split into 8 bits for the network ID and 24 for the
>host ID in a Class A; for Class B it is 16 and 16, and for Class C
>it is 24 and 8.
>
>Now, with subnetting, we take this two-level structure and change
>it into a three-level structure. This is done by taking some of the
>bits from the host ID and using them for the subnet ID. So for example,
>in a Class C network we could take 3 bits from the 8 host ID bits
>and use them for the subnet ID. This allows us to define 2^3=8
>subnets with a total of 2^5-2=30 hosts per subnet (you subtract
>two since all-0 and all-1 values are reserved).
>
>So what's the subnet mask? It is a 32-bit number where a "1" is
>placed for each bit that corresponds to the network ID or subnet ID.
>For a Class C, the first 24 bits are the network ID, so they are 1s.
>Then, since we devoted 3 bits fo the subnet ID, they are 1s also,
>for a total of 27. The remaining 5 bits are 0s.
>
>So the subnet mask is: 11111111 11111111 11111111 11100000.
>
>Converting to decimal, this is 255.255.255.224.
>
>Any specific questions, fire away.
>
>peace,
>
>-*-
>charles
I raise you two bits and will see your hand for four bits!
And hurry cuz i am in a bit of a rush too!
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