One of the practice test questions on the Boson ACRC test #1 asks to use an inverted mask for an ipx networks 10 11 12 13 14 and 15 (host node left off). The choices available are: 1.ffff.ffff.ffff, 2.ffff.ffff.ffff, 3.ffff.ffff.ffff, 4.ffff.ffff.ffff, and 5.ffff.ffff.ffff Boson says to filter networks 10 thru 13 use mask 3.ffff.ffff.ffff and I understand why - the mask 3.ffff.ffff.ffff is using 0011 in the last hex. number (the first is ignored/checked with zeros) which checks the first two bits and ignores the last two so it covers net addresses 1 thru 3 , 0001, 0010, 0011. Then to check net addresses 14 and 15 it says to use a mask of 1.ffff.ffff.ffff because it checks the first 3 bits and ignores the last - 0001, and networks 14 and 15 are 0100 and 0101 So, I can see using mask 1.ffff.ffff.ffff because it would check the first three bits and ignore the last 0001. But why doesn't the mask 5.ffff.ffff.ffff work for net addresses 14 and 15? It looks like it would check the first and third bit and ignore the second and fourth to cover nets 14 and 15, I don't see any other networks that would get blocked either; except 1 which is on the list to get blocked. Any answers? ___________________________________ 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]
