Rick Donato

Introduction Design patterns offer solutions to common software design problems. When it comes to OOP (object-oriented programming), design patterns are more focused on solving the problems of object generation and interaction, rather than the larger scale problems of overall software architecture.[1] Gang of Four In 1994, four authors --

During our busy lives, it isn't always easy to find the time to catch up of the latest buzz and news within the industry. For me, this is where podcasts really come to the rescue. They allow me to turn the typical mundane car or train journey into

Fancy learning about all the new OpenStack Infrastructure tech? Then Open Infrastructure Days UK 2019 could be for you… Tell me more! OpenInfra Days UK 2019 is a two-day (1st-2nd April) event focusing on four subject areas, loosely arranged into tracks: Open Compute Project (OCP), Scientific Computing, Cloud Native, and

Introduction There have been a number of advancements in mobile wireless communication over the last few decades, since the introduction of the first generation (1G) mobile network in the early 1980s. This evolution of mobile communication standards is a direct result of the ever increasing global demand for more subscribers

Introduction In OSPF, a single autonomous system (AS) can be divided into smaller groups called areas. This reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain. The routing devices

Introduction The goal of this article will be to provide you with the required steps to build a Virtual eXtensible LAN Ethernet VPN (VXLAN EVPN) fabric using the Cisco NXOS-9000v. The topology will be built using various protocols, so before we dive in let's look at the various

IOS Classical IOS is based upon a monolithic kernel. This monolithic kernel runs all of its modules within the same memory space, providing no CPU or memory separation. Therefore, in the event of a single process/module crashing, the entire system would become unresponsive. Another disadvantage is around upgrades, as

When it comes to Content Delivery Networks (CDNs), there is something that has always puzzled me; How do CDNs work with Anycast based DNS servers? Background For example, the way in which CDNs function is to serve content from nodes closest to the client. CDNs determine the closest node to

A routing protocol specifies how routers communicate with each other, distributing information that enables them to select routes between any two nodes on a computer network.[1] There are 4 main categories of routing protocols: * Distance Vector (RIP) * Link-state (OSPF, ISIS) * Path Vector (BGP) * Hybrid (EIGRP) Figure 1: Routing protocol