One of the nice features of Red Hat Enterprise Linux 9 (RHEL 9) OS is the ability to check, research and install only security updates from the command line. As a systems administrator, there’s always a risk that installing an update might break something important in the enterprise and lead Read More
Red Hat Enterprise Linux 9 (RHEL 9) is the latest iteration of the solid Linux OS that powers thousands of Linux servers and workstations at a gazillion companies and organizations worldwide. So how to quickly verify if the version of Red Hat Enterprise Linux OS you’re running is the latest Read More
Having a Ubuntu or Linux Mint desktop without the UFW (short for Uncomplicated Firewall) is like buying a nice home without a front door. UFW, a host-based netfilter firewall, comes standard with Ubuntu and its derivatives like Linux Mint 21. The program comes in both CLI and GUI versions. True Read More
Since Generic Routing Encapsulation (GRE) VPN tunnels continue to remain on Cisco exams like CCNA and CCNP ENCOR, let’s demonstrate a quick configuration of a GRE tunnel. Why do we care about GRE? We care about GRE because it can encapsulate diverse network layer protocols that can be transported over Read More
If you’re a networking or sys admin student, you might want to know how to identify the DNS server address of your Linux system on the Command Line. DNS refers to the Domain Name System, which resolves domain names into IP addresses. In this case, we’re talking specifically about finding Read More
CCNA Test – 75 Questions 1) What is the configuration register that ignores the startup configuration file? A. 0x4142 B. 0x4214 C. 0x2142 D. 0x2123 E. 0x4212 2) Where does RIPv2 send its routing updates? A. 127.0.0.0 B. 224.0.0.10 C. 255.255.255.255 D. 224.0.0.9 E. 255.255.255.254 3) Identify two Link-State protocols: Read More