There is the greatest likelihood that 70-291 could pose a question regarding \nsub-netting. The question is: â€œDoes Microsoft recognize determining the \nvalid number of subnets as â€œ(2 squared by number of subnet bits) - 2â€œ. Itâ€™s \nthe 'subtract 2' part that Iâ€™m not sure about. According to Cisco you should \nSubtract 2 only if:\n\n1. You see â€œno ip subnet-zeroâ€ command in router configure.\n2. Routing protocol is classful ( RIP version 1 or IGRP )\n\nNow since Microsoft shows RIP as a choice WAN protocol Iâ€™m going to bet on \nthe subtract 2. Any ideas? Any ideas where to direct the question perhaps?\n\nHonestly, I canâ€™t wait for a response from the MCPGP guys. Its sarcastic \nTuesday, let the harassment begin!!!