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]