Ok, here we go.......
We will start with basics...all network addresses end in 0. 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".
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.
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.
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.
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
======================================================================
1/15/01 4:14:37 PM, "Paver, Charles" <[EMAIL PROTECTED]> wrote:
>Am studying tcp/ip now, and have a couple of questions (believe me, this is
>the basics for you guys!) Im reading a tutorial on the web, and still am a
>little confused. I need someone to go line by line with me, please! In
>return, Ill give you a cookie :> Take the following:
>
>1. I have a network, ip address 130.5.0.0 (why is it 0.0)? Do all network
>#s end in 0? And for Class B to have the network address, must it be
>x.x.0.0? Cant I have something like 172.5.5.0? I understand 130, for class
>b, but where did they get 5 from?
>
>2. Next I have the list of ips on my network, per pc (or device). Such as
>:
>
>130.5.32.0
>130.5.64.0
>130.5.160.0
>130.5.224.0
>
>So, are they on the same network or not? I know that each pc must have its
>unique host--I dont want you guys to think Im that basic with this; yes Im
>weak, but I do know that with class b its network.network.host.host--> So,
>the host id seems to be on the same network while the host is having a
>dfferent id. I just get confused when I read a class B and think, which
>parameter has to be changed? The 3rd octect ONLY or the 4th as well.
>
>_________________________________
>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]
_________________________________
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