------- Start of forwarded message -------
From: Jennifer Cribbs <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: RE: subnetting and tcp/ip my correction...and comment
Date: 1/15/01 11:30:53 PM
Yes, thank you, he did in spite of how I behaved.....He went into great detail and for
that I am grateful.
Jennifer
1/15/01 9:01:40 PM, sam adams <[EMAIL PROTECTED]> wrote:
>Did he mention that hellos are multicast to AllSPFRouters (224.0.0.5)?
>
>Has he already described VLSM to you?
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Jennifer Cribbs
>Sent: Monday, January 15, 2001 4:41 PM
>To: [EMAIL PROTECTED]
>Subject: RE: subnetting and tcp/ip my correction...and comment
>
>
>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]
>
>_________________________________
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
Have a Great Day!!
Jennifer Cribbs
[EMAIL PROTECTED]
-------- End of forwarded message --------
Have a Great Day!!
Jennifer Cribbs
[EMAIL PROTECTED]
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FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
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