RE: Summarization

[Chuck Larrieu]

126.213.64.0 = 0100 0000 .0 126.213.95.0 = 0111 1111 .0 subnet mask = 1100 0000 .0 = ?   do you see it? the summarization boundary occurs at the last point to the left where all bits in both rows are the same. in your example, that is at the point between the 64 and the 32 position. or at the 64 position, to be precise.   I'm not sure I understand the second part of your question. Routers don't necessarily summarize on their own. they work only with what they are given via the configurations you enter. Every ip address has a host portion and a network portion. the network portion is determined by the mask you apply. network determination is made through a simple ( to a computer ) boolean XOR operation. the computer could care less where the network bits begin and end.   Chuck  -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of archstein Sent: Monday, November 13, 2000 8:28 PM To: [EMAIL PROTECTED] Subject: Summarization   Hi groups...   Can you help me please ? What is summary address  for subnet 128.213.64.0 - 128.213.95.0 ? Is that right if the summary address is 128.213.64.0 255.255.192.0 To determine ther sumary route, the router looks for the most highest-order number of bits that match. If there is no match bits, how to summarize ??? Thanks