Here is how i remember the host range, this is a quote from a Cisco text (I dont remember which one since i made a flash card of the info) "Once you have computed the subnet mask to figure the valid subnets use the formula 256 - subnet mask = 1st net." Exp: 4 subnets needed: mask would be 11100000 = 224 256 - 224 = 32 = first useable net so that gives net address = 32, 1st host = 33, last host = 62, broadcast = 63. Hope this helps Rick On Mon, 4 Sep 2000, Circusnuts wrote: >Date: Mon, 4 Sep 2000 11:01:14 -0100 >From: Circusnuts <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: Quick Remedial Subnetting Theory (not hard I swear)... > >I broke out the CCNA book, to practice readings for a couple of up & coming >interviews (this week). Here is what I have forgotten :-) OK- I can >calculate the mask (no issues here), but I cannot logically figure out how I >would start the host addressing. Case in point (bare with me, this all >looks soooo familiar it might just set back in while writing this :-) > >192.16.12.0 is my given class C > >I need 10 users (hosts- 11 counting the Ethernet Interface) > >So this means I must take 2 to the 4th (16-2= 14 usable) on the mask side & >that leaves me with 2 to the 4th on the Host addressing side (same 14 >usable). > >How to I proceed with the first to last IP's available... i.e. > >My nature tendency, it to look @ things this way... >192.16.12._ to _, does this mean I am now in the 16's if I recall. >192.16.12.1 thru 15, 192.16.12.16 thru 31, 192.16.12.32 thru 63, etc... > >The book I have (full of typo's) starts with a 192.16.12.144 as the first >address... > >Hope this is not too confusing... >Thanks All !!! >Phil > > >___________________________________ >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html >FAQ, list archives, and subscription info: http://www.groupstudy.com >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]