1. 0.0 is the host portion, reserved for your host IDs, the network portion
is 130.5, given the default subnet mask of 255.255.0.0. Not all network
numbers end is 0s. For instance, if your subnet mask is 255.255.255.252
(classic for a point-to-point network), your network number might be
192.1.1.4. You can have a network number of 172.5.5.0. What really
dictates where the network ends, and the host portion begins, is the subnet
mask.
In order to fully understand IP addressing, take the IP address and covert
it to binary. Take your example: 130.5.0.0, in binary is
10000010.00000101.00000000.00000000 (the bit values are 128 64 32 16 8 4 2
1). The default subnet mask for a class B address is
11111111.11111111.00000000.00000000. The ones (on bits) in a subnet mask
designate "network" values, while the zeros (off bits) designate values that
can be used for host numbers. Remember to follow the simple rule that the
host portion cannot be all 1s (broadcast), or all zeros (this network only).
You really can't learn IP addressing quickly in an email, but be positive,
and you will get it!
2. You can't tell if two IPs are on the same network without taking the
subnet mask into consideration. You refer to a class B (subnet mask
255.255.0.0). This being the case, all 4 numbers given refer to the same
network. In a default class B network, the first two octets designate the
network number, leaving the last two octets for hosts. In your example, the
130.5.0.0 is the network number, and the third and fourth octet are for
hosts.
HTH,
Evan
P.S. This is a pretty good reference, but once you get it, you got it!
http://www.3com.com/nsc/501302.html
-----Original Message-----
From: Paver, Charles [mailto:[EMAIL PROTECTED]]
Sent: Monday, January 15, 2001 3:15 PM
To: '[EMAIL PROTECTED]'
Subject: subnetting and tcp/ip
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.
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