Ok I guess I deserved that. I was thinking of the 4th bit has a value of 8 in my head and forgot to add the values of the rest of the bits.
-----Original Message----- From: Michael L. Williams [mailto:[EMAIL PROTECTED]] Sent: Monday, July 08, 2002 10:01 PM To: Andy Hoang; [EMAIL PROTECTED] Subject: Re: Class C summarization question [7:48367] Wow..... According to my binary math, 4 bits = 16 combinations. 1 bit = 2 combinations (2^1 = 2) 2 bits = 4 combinations (2^2 = 4) 3 bits = 8 combinations (2^3 = 8) 4 bits = 16 combinations (2^4 = 16) Now..... when converting from binary to decimal, the 4th bit (from the right) has a (decimal) value of 8 (2^[4-1]), but of course when you add the values of the bits from 4 down, you get 8+4+2+1 = 15 (thus giving 16 combinations, 0 through 15) (Too all that have read my posts in the past, now you know why I bitch up a storm when I hear someone encourage someone else to memorize subnetting charts and bitswapping charts instead of taking an hour and learning how binary actually works... geez) Mike W. ----- Original Message ----- From: Andy Hoang To: Michael L. Williams ; Sent: Monday, July 08, 2002 10:51 PM Subject: RE: Class C summarization question [7:48367] > I would say 8 is correct. 4 bits make 8 combinations. > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > Michael L. Williams > Sent: Monday, July 08, 2002 8:15 PM > To: [EMAIL PROTECTED] > Subject: Re: Class C summarization question [7:48367] > > > I would say 16 as well..... > > Mike W. > > > "Dain Deutschman" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I'm confused about a practice question for BSCN that I came across: > > > > Your routing tables are getting very large and you need to configure route > > summarization. How many class C internet addresses can you summarize with > a > > /20 CIDR block? > > > > Answer: 8 > > > > Would it not be 16? Where am I going wrong? > > > > -- > > Dain Deutschman > > CNA, MCP, CCNA > > Data Communications Manager > > New Star Sales and Service, Inc. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48458&t=48367 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
