Managing Basic Networking on RHEL 8

In this lab you're a sysadmin who needs to be more familiar with your network configuration, including what devices exist on your system, what their states are, what files are used to enable inactive or unconfigured interfaces and how to confirm that your network devices are working properly.

You'll then be working with a slighly malfunctioning name resolution setup, discovering what data is kept in what files, and how they interact to get your desired hostname resolved to an IP address.

You'll be using utilities such as nmcli, ip, vim, ifup, ping, and dig in this lab, and encountering files such as /etc/sysconfig/network-scripts/ifcfg-eth0, the /etc/hosts, /etc/resolv.conf, and /etc/nsswitch.conf files, and more as you troubleshoot why you cannot get accurate information about a remote domain's DNS.

Note: On some systems, Crtl-w closes the window you are working on. To avoid that problem, you can ssh in using two different ssh sessions, using your preferred ssh client application, and edit the files side by side in the different windows. Also, AWS's implementation of IPv6 makes it extremely difficult to provide a consistent IPv6 environment, so in the interest of making sure your lab experience is as trouble-free as possible, we confirm IPv6 addressing but do not go further than that.

Red Hat Exam Requirements Covered:

• Configure IPv4 and IPv6 addresses
• Configure hostname resolution
• Configure network services to start automatically at boot