[4] A. What following commands do?

• chmod 700 ~/bin/backup.bash

• chown Rv named.named /var/name/*

B. What following commands do?

• rpm qa | grep bind-utils

• yum y update

• yum y groupinstall GNOME Desktop

C. What following command do?

• for i in $(seq 50 70);do echo jb356-$i IN A 139.182.148.$i >> named.jb356 ; done

D. How to add sudo user and regular user in Linux?

• Sudo user:

• Regular user:

E. What following commands do?

• tail -20 /var/log/messages

• cat /var/log/secure | grep Failed |less

F. What following commands do?

• lsmod

• modprobe

G. What DHCP server do?

H. What following commands do?

• ping c4 google.com

• nmap p 80 www.csusbcoyote.net

• traceroute www.google.com