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Alien wrote: I passed the 640-801. For preparation i have been using sybex study guide by Todd(4th ed), Cisco Academy Curriculum, remote labs from NETLab, Techexams and subnetting in my head while walking. Thanks to Webmaster for the great site and all you professionals who are always willing to clear things up and offer advice. Cheers
Alien wrote: Thanks to everyone. Sorry for the late reply, i had to celebrate and as for the question i don't have any techniques other than capturing the concepts. Once you understand subnetting VLSM should be easy. Say you have a single class C IP address. You can use a 30bits subnet mask for the WAN connections since it only allows 2 valid host addresses and a 28 bit subnet mask for a network requiring 14 hosts etc. The idea is to avoid wasting address spaces like using a 26bit mask(62 hosts) on the routers WAN interfaces. This means only 2 address will be used and 60 will go down the drain. I hope that clears it up a little otherwise i recomend you go over Todd Lammle's chapter on IP addressing. He has better techniques Cheers and goodluck!
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