Thank you Craig for correcting me. I glad I have it basically correct, since
all I have is your basic ccna. I have no more knowledge than that.
As far as all your info you enclosed...who is it for? Me or Charles, who
wanted to know why there are zeros at the end of an network address?? If we
go this way and go into that much detail with him, don't you think you should
explain first of all to charles what a classful address is and then explain
how that is related to the trailing zeros in answering his questions regarding
basic network addresses and why they have zeros at the end?? If you also want
to confuse his "basic" question and tell him about a loopback address, before
you can explain what a loopback address is, you have to get him to understand
the concepts of a network address or no point has been made!! And nothing is
understood. Information when you start out has to build or you never get the
concept and without the conceptual understanding, you fail the test.
And yes craig, I know that routers base their information on binary numbers
and not numerical numbers, but charles did not ask the question in regards to
binary numbers. He used his examples from a numerical point of view. And
also, but maybe you don't remember, when you start out, you don't really cover
multicast and experimental addresses, because it's is overwhelming at times to
just get the concept of a class b....
Jen
By the way...explain to me what a vlsm network is...from a basic standpoint..
>===== Original Message From Craig Columbus
<[EMAIL PROTECTED]> =====
>Jennifer has it basically correct. See my comments below for corrections.
>
>Craig
>
>At 04:21 PM 1/15/2001 -0600, you wrote:
>
>>Ok, here we go.......
>>
>>We will start with basics...all network addresses end in 0.
>
>Sort of true. All *classful* network addresses end in 0, but VLSM networks
>can end in other numbers. For example, it's completely possible to have a
>network address of 200.200.200.64 if there are 2 or more bits of subnetting.
>
>>Whether they have 1,2,3 zero's depends on whether it is a class A, a class
>>B, or a class C network
>>address...
>>class A 0-127, which is x.0.0.0 , as long as the x, is between
>>0-127, it is a class A "network address".
>
>Actually, 127.x is reserved for loopback.
>
>>class B 127-191, which is x.x.0.0, as long as the "first x" is between
>>127-191, it is a class B "network address."
>>class C 192-223, which is x.x.x.0, as long as the "first x" is between
>>192-223, it is a class C "network address."
>>
>>You don't need to worry about class D or E. They are for experimental
>>purposes and they have the first number set in access of 223.
>
>E is still experimental, but D is multicast and is frequently used.
>
>>Network addresses are assigned by internic to companies and whether the
>>companies get a class A, B, or C depends on the size of the network and
>>availability .
>>Gov agencies usually have A's. Very large corps. usually have a B, and
>>everything else has a C.
>
>Not necessarily true. While there are many large companies with class A
>addresses, most addressing today is classless. It's very common for large
>companies and government agencies to have contiguous blocks of class C
>addresses. So, for lack of a better example, your network allocation may
>be 212.0.0.0/8.
>
>
>>When companies get their network addresses, they can break them down into
>>private addressing for organization within their companies, and for ease of
>>management. And that's where the other numbers come from that you were
>>referring to. BUT, the address class is determined by the first number,
>>or the first octette.
>>If your number is in binary format, you add it up to figure out what the
>>class is. Do you know how to do that? If not e-mail me.
>
>Sort of. The class is actually not determined by the first octet, but
>rather by the first 2 bits of the octet. For example, routers base their
>classful distinction on the initial bit pattern of 00 (A), 10 (B), or 11 (C).
>
>>Your address of 172.5.5.0, is a class B with a network address of
>>172.5.0.0.....The 5 in the third octette is from within the company and is
>>the address of one of their
>>subnets and is used by their router to direct traffic to that particular
>>subnet within their company. Routers "out there" in the WAN side of the
>>world only use the
>>network addresses for routing. And you have to know what class it is, in
>>order to determine how many octettes are in the "network address" . An
>>address of
>>192.5.4.3 has a network address of 192.5.4.0, because it is a class C, and
>>therefore is of the form x.x.x.0
>>
>>The 4 addresses you have:
>>
>>130.5.32.0
>>130.5.64.0
>>130.5.160.0
>>130.5.224.0
>>
>>All these addresses come from the same network, because their network
>>address is 130.5.0.0. It is a class B of the form x.x.0.0 The other
>>numbers direct the traffic
>>to different, specific parts of that network within the private company
>>that has the network number 130.5.0.0. Those other numbers are derived
>>from by a process
>>known as subnetting and that's a different lesson.
>>
>>Good Luck!
>>Jennifer Cribbs
>
>
>Hope this helps.
>
>Craig
>
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Have a Good Day!!
Jennifer Cribbs
[EMAIL PROTECTED]
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