The lab saves the network configuration (NetworkManager's profiles on the RHEL family; netplan and systemd-resolved's settings on Ubuntu) so reset can put it back. Task 2 needs the VM to resolve names on the internet.

Tasks

Read /etc/nsswitch.conf, and check whether /etc/resolv.conf is a link with ls -l. Which program writes it? Write its name to /root/lab-answers/1.
Add example.org as a search domain (through NetworkManager or systemd-resolved, since resolv.conf is generated), persistently, and look up the short name www: getent hosts www must find www.example.org.
Add 192.168.1.250 fake.example.org to /etc/hosts. Compare getent hosts fake.example.org with dig fake.example.org, and work out why they differ. Write the address getent prints to /root/lab-answers/3, then remove the line from /etc/hosts.

Hints

ls -l /etc/resolv.conf; the comment at the top of the file.
nmcli connection modify ... ipv4.dns-search, then nmcli device reapply; or Domains= in a drop-in in /etc/systemd/resolved.conf.d/, or search: under nameservers: in netplan. resolvectl status and cat /etc/resolv.conf show it.
dig is in bind-utils on the RHEL family and bind9-dnsutils on Ubuntu. Which of the two reads /etc/hosts?