Interface errors can be the first signs of deeper problems, and in this episode, we cover the most common indicators that a link is failing. You’ll learn how to recognize and interpret error messages such as input/output drops, late collisions, CRC errors, and alignment problems. These clues can point to physical issues like bad cabling, interference, or even failing hardware components like transceivers or ports.

We also examine how environmental conditions—such as temperature, humidity, and airflow—can impact network reliability. You’ll learn about SNMP-based environmental sensors, thermal monitoring, and proactive steps to prevent equipment failure due to environmental stress. This episode teaches you to think beyond configuration and into the physical reality where your devices live.

Logs are a goldmine of operational insight—and in this episode, we explain how to access, interpret, and act on the information they provide. You’ll learn about Syslog, the standard logging protocol used by most network devices, and how to configure Syslog levels to capture just the right amount of detail. We also discuss the role of centralized logging servers and how they support forensic analysis, trend detection, and compliance.

Beyond Syslog, we examine interface statistics and event auditing on routers, switches, and firewalls. Topics like up/down events, input/output errors, CRC counts, and administrative actions are broken down into understandable units. By the end, you’ll be prepared to read and respond to logs as a regular part of network maintenance and troubleshooting.

Monitoring network health begins with knowing what to measure—and how. In this episode, we cover the essential performance metrics that indicate how well a network is functioning, including bandwidth usage, latency, jitter, packet loss, and error rates. You’ll learn what thresholds are considered acceptable and how performance metrics help predict or detect problems before users notice.

We also introduce SNMP (Simple Network Management Protocol) and how it enables communication between devices and monitoring platforms. We explain SNMP versions, how MIBs work, and how sensors and agents collect performance data. These tools form the backbone of network monitoring systems, enabling alerts, dashboards, and proactive support. Mastering this material is essential for both the exam and real-time operations.

In Domain 3, we shift focus from implementation to operation, diving into what it takes to maintain, monitor, and document a functional network. This episode provides an overview of what you’ll encounter throughout the domain, including topics like network performance metrics, configuration management, change control processes, and incident response. Unlike the theoretical planning of earlier domains, this one reflects the day-to-day tasks of a working network technician.

You’ll also be introduced to core concepts such as baselining, SLA enforcement, and how to properly document your network for compliance, auditing, and recovery. If Domain 2 was about building the network, Domain 3 is about keeping it running—and recovering when something breaks. This episode prepares you to think like an operations engineer, ready to monitor, react, and maintain.

Multiple-Input, Multiple-Output (MIMO) is one of the most powerful features in modern wireless communication, dramatically increasing speed and efficiency. In this episode, we explain how MIMO works by allowing multiple data streams to be sent and received simultaneously using multiple antennas. You'll learn about spatial streams, signal reflection, and how beamforming targets specific devices to improve range and performance.

We also discuss MU-MIMO (Multi-User MIMO), which enables routers to serve multiple clients simultaneously rather than sequentially. These technologies are core to 802.11ac and 802.11ax (Wi-Fi 5 and Wi-Fi 6) and play a huge role in optimizing wireless throughput in crowded environments. Understanding MIMO helps you design and troubleshoot Wi-Fi systems that perform well even under heavy load.

Cellular networks offer wide-area coverage and are vital for connecting mobile devices and remote locations to the internet. In this episode, we walk through the evolution of cellular technology from 3G to 4G LTE and the newest 5G deployments. You’ll learn the differences in speed, latency, and frequency band usage across each generation, and how they impact performance in different environments.

We also explore cellular architecture, including SIM authentication, mobile device handoff, and the use of modems and hotspots in enterprise deployments. Cellular tech increasingly powers IoT, field operations, and backup links, making it an essential topic for networking professionals. This episode ensures you can interpret signal metrics, manage cellular hardware, and understand how mobile data integrates into broader infrastructure.

Wireless networks require more than just a strong signal—they also demand strong security. In this episode, we explore the evolution of wireless encryption, from outdated protocols like WEP to modern standards like WPA2 and WPA3. You'll learn how each encryption method works, what vulnerabilities exist, and why pre-shared keys are appropriate in some environments but not in others.

We also cover enterprise-grade wireless security, including 802.1X authentication, RADIUS integration, and certificate-based login systems. These practices ensure only authorized devices gain access, even in environments with thousands of users. Whether you're locking down a home network or building secure wireless infrastructure for a corporation, this episode gives you a comprehensive roadmap for wireless protection.

Wireless networks can be built in several topologies, and choosing the right one affects everything from coverage to scalability. In this episode, we compare ad hoc and infrastructure mode, explain what an SSID is and how it’s broadcasted, and examine the use of multiple SSIDs in multi-tenant or enterprise environments. You'll also learn about wireless isolation, SSID hiding, and service set types like BSS, ESS, and IBSS.

We then turn to antennas—omnidirectional vs. directional, gain measurements, and how antenna choice influences coverage patterns. Properly deploying antennas can make the difference between seamless coverage and constant dropouts. This episode ties together logical network design with physical signal deployment to help you create stable, predictable wireless environments.

Wireless networks are built on radio frequencies, and how you manage those frequencies has a massive impact on performance and reliability. This episode covers the 2.4 GHz and 5 GHz frequency bands, channel availability, and how channel overlap can cause interference and performance degradation. We explain how to choose non-overlapping channels in dense environments and how tools like Wi-Fi analyzers help you visualize spectrum usage.

We also cover channel bonding, bandwidth allocation, and how DFS (Dynamic Frequency Selection) works in the 5 GHz range. These topics are essential for deploying wireless networks that avoid contention, reduce retransmissions, and maximize throughput. Whether you’re tuning an enterprise network or helping users with laggy connections, this episode gives you the tools to optimize your wireless spectrum.

Wireless networking continues to evolve rapidly, and understanding the 802.11 family of standards is essential for modern network support. In this episode, we walk through the progression from 802.11a and 802.11b all the way to today’s high-speed 802.11ax (Wi-Fi 6). You'll learn which frequency bands each standard uses, what modulation types they employ, and the maximum data rates supported in typical environments.

We also explain backward compatibility between standards, channel widths, and the importance of features like MIMO and beamforming. This episode prepares you to compare and choose the right standard for specific applications, understand performance limitations, and configure devices for compatibility. Wireless is a major topic on the exam and in every real-world network—this episode ensures you're up to speed.