Q: What is an ELF file?
A: Unix executable file format (Executable and Linkeable Format), common exec file for linux.
Q: How do you query the type of a cpu using cat?
A: cat /proc/cpuinfo
3:
Q: What does the 'w' command output?
A: uptime and load average
4:
Q: What does load average tell us:
A: measures the number of threads that are working and waiting to work (CPU, disk, uninterruptible locks).
5:
Q: How many hosts does a IP v4 class B network have?
A: 65534.
6:
Q: What does NAT stand for and when is it used?
A: Network Address Translation. A NAT Gateway is a host that bridges connectivity between a private network
and the outside networks.
7:
Q: How do you permenantly configure FD limits in linux
A: By Editing /etc/security/limits.conf and adding appropriate for 'nofiles' (hard and soft) entries.
NB: 'ulimit' is not the right answer, that only affects the current session.