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Guys, There is a little update on the exam front. Yesterday a friend of mine took the exam and these are the changes he reported. 1) Enabel kernel parameter kernstack by setting its value to 1. and is should reflect to /proc/cmdline after reboot. Well, everyone knows this. The reason for telling this one is because for some time they have been asking to enable "sysvctl". 2) Enable the ip forwarding and disable ping request coming to your system. Note one thing here: they have asked you to disable incoming ping request. So guys just be a little careful if you are using iptables to block icmp. Thanks & Bye