Where in the Windows AD is the default folder for users?

Here are some of the questions I could remember, ranging from Linux, DNS, TCP/IP, Networking and other computer related stuffs: difference between tcp / udp 7 OSI layer (sample of each layer) what is ARP what is SNMP how SNMP works difference between switch and hub difference between default GW and static route TCP/IP handshake port for SNMP port for DNS why we need ip subnetting difference between VPN IPSEC vs VPN SSL difference between FTP passive vs active mode how to reset root password in linux command to check routing table in linux command to check disk space in linux command to list running processes in linux example of linux file systems what is inode where is the location of most linux configuration files command to verify and check linux filesystem command to list all running ports in linux what is symbolic link location of bind configuration file in linux difference between /var/log/syslog and /var/log/messages what is RFC what is http header what is cookie example of application using UDP list of http status codes what is MX record what is A record