A network has many network printers connected and they should get their addresses using DHCP. What information from each printer is needed to always assign them the same IP address when dhcpd is used as the DHCP server?

How can a user’s default shell be checked, by querying an NIS server?

A new user was created on a master NIS server using useradd but cannot log in from an NIS client.Older users can log in. Which step was probably forgotten, when creating the new user?

Select the alternative that shows the correct way to disable a user login (except for root)

Which command would release the current IP address leased by a DHCP server?

Which records must be entered in a zone file in order to use "Round Robin Load Distribution" for a web server?

Which command line create an SSH tunnel for POP and SMTP protocols?

An iptables firewall was configured to use the target MASQUERADE to share a dedicated wireless connection to the Internet with a few hosts on the local network.
The Internet connection becomes very unstable in rainy days and users complain their connections drop when downloading e-mail or large files, while web browsing seems to be working fine.
Which change to your iptables rules could alleviate the problem?

Connecting to a remote host on the same LAN using ssh public-key authentication works but forwarding X11 doesn’t. The remote host allows access to both services. Which of the following can be the reason for that behaviour?

Which THREE of the following actions should be considered when a FTP chroot jail is created?