A Software Defined Wide Area Network (SD-WAN) is a concept that has been around for over a decade. SD-WAN is a WAN architecture that uses software-defined network technology to deliver a high availability, low cost, and highly flexible WAN connections over the Internet and other public networks. In this article, we will attempt to shed […]
About Lazaros Agapidis
Lazaros Agapidis is a Telecommunications and Networking Specialist with over twenty years of experience.
He works primarily with IP networks, VoIP, Wi-Fi, and 5G, has extensive experience in training professionals for Cisco certifications, and his expertise extends into telecommunications services and infrastructure from both an enterprise and a service provider perspective.
In addition to his numerous vendor certifications, Lazaros has a solid online presence as an expert in his field, having worked in both public and private sectors within North America and in Europe.
He has enjoyed sharing his practical experiences in writing as well as through engaging online training.
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Comparison of GNS3 vs EVE-NG vs Packet Tracer for Networks Simulation
I have had many years of experience training students and professionals in networks and telecommunications. In those years, I have found time after time that the single most important activity a trainee can do to learn networking concepts is to spend time in the lab. Creating network topologies and applying the theory learned in the […]
Subnetting vs Supernetting – What’s the Difference? (Explanation Guide)
Subnetting and supernetting are two processes that are applied to IPv4 address spaces. Each one serves a different purpose and can be used in various applications. In this article, we’ll examine and compare Subnetting vs Supernetting in IP networks and see how they are applied to various aspects of network design and configuration. Structure of […]
Cisco Command to Test a Copper UTP Ethernet Cable on a Switch
Troubleshooting physical layer problems on UTP Ethernet cabling can sometimes be a nightmare. Dealing with patch cables is a snap, but what happens if your structured cabling has a fault, or if a newly created UTP cable results in intermittent connectivity? Further still, what if you don’t have direct access to the faulty cabling because […]
Comparison of Distance Vector vs Link State Dynamic Routing Protocols
Dynamic routing protocols are used by Layer 3 network devices to automatically share routing information. Various routing protocols have been developed over the years, but most fall into one of three categories: Interior Gateway Protocol – Distance vector, such as EIGRP or RIP Interior Gateway Protocol – Link state, such as OSPF or IS-IS Exterior […]
Top 10 Network Administrators Software Tools (Free&Paid)
A carpenter is only as good as his hammer. A knight is only as good as his sword. A writer is only as good as his pen. These experts would amount to very little if they didn’t have their respective tools to get their jobs done well. Similarly, a network administrator is only as good […]
Comparison of H323 vs SIP Protocols Used in VoIP and IP Telephony
Voice over IP (VoIP) is a technology that allows you to transmit voice over an IP network. This enables both telephony and data to be transmitted over the same network packet-based infrastructure. There are two fundamental protocols used to transmit the signaling that is necessary to make IP telephony operate correctly. These protocols are Session […]
Comparison and Differences Between IPv4 vs IPv6
The Internet Protocol (IP) is the fundamental protocol that enables end-to-end communication between hosts on the Internet. Living in the Network Layer of the OSI model, IP is able to reach the intended host by simply using the destination IP address and the routing protocols that have been configured on the networks between the hosts. […]
Comparison of NAT vs PAT in TCP/IP Networks for IP Translation
Network Address Translation (NAT) is a feature that enables the translation of IPv4 addresses. It is most often used to translate private IPv4 addresses to public routable IPv4 addresses. This feature has almost singlehandedly vastly increased the longevity of the IPv4 protocol as the primary Network Layer protocol running on the Internet, since it resolves […]
Comparison of OSPF vs RIP/RIPv2 Routing Protocols in IP Networks
Open Shortest Path First (OSPF) and Routing Information Protocol (RIP) are two of the most well-known Internal Gateway Protocols (IGPs) among network professionals and enthusiasts alike. Both are among the oldest routing protocols developed for IP networks, but they have evolved in very different ways, and are ultimately used today for very different purposes. Let’s […]
Comparison of EIGRP vs OSPF Routing Protocols
Open Shortest Path First (OSPF) and Enhanced Interior Gateway Protocol (EIGRP) are two of the most popular Internal Gateway Protocols (IGPs) employed in today’s modern IP networks. Both are mature protocols, having been around for decades, and are extremely reliable, flexible, and highly configurable. And yet, they are surprisingly dissimilar in their architecture, implementation, and […]