Category: Networking & Virtualization

In security courses such as Learning Tree’s System and Network Security Introduction, we often hear about the insecurity of protocols such as Telnet. These older protocols send their data – including login credentials – over the network in the clear. While ssh, a secure alternative to Telnet, is used in many applications today, many sites […]

A casual mention of Vehicle to Everything, or V2X,  in a mailing list, led me to a short article, and that led to much more. It made me aware of a project that may make huge changes to how we get around. Roads can measure cars in very limited ways today with inductive loops at […]

When I first worked with TCP/IP and the ARPAnet, there was no DNS. When one wanted to connect to a computer by name, the system looked in a table called “HOSTS.TXT” to find the IP address corresponding to the name. The growing file had to be downloaded every few days from a “nearby” host that […]

In 1983, in the midst of the Cold War and Irene Cara’s Flashdance, IPv4 was born. At the time, the conventional wisdom was that 4+ Billion (232 to be precise) unique IP addresses would be more than enough for all of humanity for a very long time. But then the Internet escaped from the guarded […]

Software-Defined Networking or SDN is a hot topic right now. Learning Tree has a Software Defined Networking course, and industry publications and blogs are full of talk about SDN. But what is really going on right now with SDN, and where is it going? Surveys Say, It Isn’t Popular Yet Webtorials did a survey in […]