Which of the following Wi-Fi chalking methods refers to drawing symbols in public places to advertise open Wi-Fi networks?

What will the following Linux command accomplish? dd if=/dev/mem
of=/home/sam/mem.bin bs=1024

What binary coding is used most often for e-mail purposes?

Why would you need to find out the gateway of a device when investigating a wireless attack?

John is using Firewalk to test the security of his Cisco PIX firewall. He is also utilizing a sniffer located on a subnet that resides deep inside his network. After analyzing the sniffer log files, he does not see any of the traffic produced by Firewalk. Why is that?