2000 with 3 bits will match from 2000 to 3FFF 2000 with 4 bits will match from 2000 to 2FFF
2000 with 5 bits will match from 2000 to 27FF 2000 with 6 bits will match from 2000 to 23FF 2000 with 7 bits will match from 2000 to 21FF Looking at the bits that we have that match, the first 5 are in common: 0010 0xxx xxxx xxxx Converting back to hex gives 2 for the first hex digit, and 0 for the other hex digits. If you're not sure why it would be 2000, what do you think it would be? Sometimes understanding why one answer is wrong is just as important as understanding why one answer is right. Marvin Greenlee, CCIE #12237 (R&S, SP, Sec) Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: [EMAIL PROTECTED] Progress or excuses, which one are you making? _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Giorgio Pierbattisti Sent: Saturday, June 28, 2008 4:16 AM To: [email protected] Subject: [OSL | CCIE_RS] IPV6 summary-address Hi ! Vol 1 ver 10 pag 749 . I understand why is going to be a 53 bits mask but not why will be 2000. Thanks for your help.
