The ‘line vty 0 15’ command in Cisco networking is used to configure and manage virtual terminal lines (VTY lines) on Cisco devices. VTY lines are software-based interfaces that allow administrators to establish a terminal session over a network connection to configure and manage the device remotely. How to Use the ‘line vty 0 15’…
This is an interactive map of the world’s data centers. These are places where you often can purchase colocation, high speed Internet, and other services. When the world talks about the cloud, or remote servers, these are the actual physical locations where much of this computer power is stored. Most of these data centers contain rows of…
The CCNA (Cisco Certified Network Associate) Routing & Switching certification is one of the most sought after networking certifications. It is often the best way to get your food in the door of a great networking and IT career. The CCNA is a big step above certifications such as CompTIA’s Network+ or Security+. You will…
Iperf is a tool used to measure bandwidth limits. There’s a number of public iperf servers you can test to, but some require version 3 of the iperf program. This can be a bit tricky as Ubuntu seems to have version 2 of iperf in their default repository list. Here are two ways to install iperf version…
A Japanese virtual private server (VPS) is a great idea if you need a server that is largely going to be accessed by Asian users. Japan is a stable, well developed country with fast Internet speeds. Unlike China and certain other Asian countries, Japan allows free compute usage, so government permits and censorship should not…
The Open Systems Interconnection (OSI) layer model is a way of describing communications by computer systems over networks. The goal is to set a standard for how communicating over a network should look. The OSI model is not protocol specific, but instead different protocols belong in different layers. The layering of communication protocols allows for…
Changing the file extension for multiple files in a Linux directory is easy. If you need to add something to the end of every filename in a directory or if you want to remove text from the end of a filename in a directory you can use a simple bash loop. A bash loop will…
As technology continues to advance, the role of a system administrator has evolved beyond traditional tasks of managing servers and networks. Today, system administrators are expected to possess programming skills to automate tasks, streamline operations, and enhance overall efficiency. With a plethora of programming languages available, it can be overwhelming to determine which one is…
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A looking glass server is a tool provided by networks, usually larger Internet service providers (ISPs), which allows users to see what the Internet looks like from the point of view of the routers within that particular network. A looking glass is a crucial tool for diagnosing Internet related networking issues. It is also extremely…