Certified - CompTIA Network + Audio Course

To wrap up the series, this episode reviews the full troubleshooting methodology—from identifying the problem to documenting the fix. We walk through common scenarios, showing how the steps apply in real life and what tools are best suited for each phase. You’ll revisit techniques for isolating symptoms, confirming theories, and verifying solutions with clarity and structure. We also provide exam...

Not every issue fits into neat categories. In this episode, we address edge-case problems like Bring Your Own Device (BYOD) compatibility, expired licenses on security appliances, and odd client behaviors that defy conventional logic. You’ll learn how mobile OS updates, unsupported encryption protocols, or insufficient license capacity can cause mysterious connectivity issues. We also touch on VPN...

This episode revisits advanced troubleshooting at the hardware and optical layer. We cover transceiver problems, dirty fiber connectors, power mismatches, and switch backplane limitations. You'll learn how to read interface stats for clues, test suspect links, and isolate faults in a complex network environment. We also explain how hardware limits—such as CPU, memory, or buffer overruns—can degrad...

DNS and NTP are often invisible—until they fail. This episode shows how to diagnose and fix issues with domain name resolution and time synchronization, both of which affect authentication, connectivity, and performance. You’ll learn how to use nslookup, dig, and ntpq to troubleshoot problems and interpret server behavior. We also cover how expired DNS records, cache poisoning, NTP drift, and fire...

Some network issues are subtle, involving advanced concepts like asymmetric routing, multicast flooding, and access control list (ACL) errors. This episode explains how asymmetric routing—where traffic returns on a different path than it arrived—can confuse firewalls and lead to dropped packets. We discuss how to diagnose and design around this behavior using symmetric paths and session tracking....

Poor network segmentation can lead to serious Layer 2 and Layer 3 problems. In this episode, we explain how excessive collision domains on legacy hubs or poorly configured switches can slow performance and cause retransmissions. We also dive into broadcast storms—where unchecked broadcast traffic floods the network—and routing loops, which occur when routers send traffic in circles due to misconfi...

Routing issues can silently break connectivity—even if everything looks fine at Layer 2. In this episode, we diagnose common routing problems, including missing default routes, misconfigured static routes, and incorrectly advertised subnets. You'll learn how to use ping, traceroute, and routing tables to spot when traffic is being dropped or misrouted. We also explore DHCP-related routing issues a...

Sometimes network issues stem from the basics: incorrect VLAN assignment, disabled interfaces, or outdated configurations. This episode walks through foundational network checks that resolve a surprising number of connectivity issues. You'll learn how to verify trunk ports, check interface status, review MAC address tables, and ensure endpoints are in the correct VLAN. We also cover configuration...

Even if the signal is strong, configuration mistakes can block connectivity. This episode addresses common wireless configuration errors such as mismatched SSIDs, incorrect security settings, or outdated drivers on client devices. You’ll learn how WPA2 vs. WPA3 affects compatibility, how authentication failures are logged, and what to check when clients can see a network but not connect. We also c...

Signal problems are among the most common wireless complaints—and many stem from poor antenna planning. This episode examines how antenna placement, orientation, and environment affect signal propagation. You'll learn the difference between omnidirectional and directional antennas and how line-of-sight, reflection, and absorption affect coverage. We also cover channel selection, overlap, and the i...

Wireless technology is incredibly convenient—but also limited by physical and environmental factors. In this episode, we explore the inherent constraints of wireless communication, such as reduced throughput compared to wired networks, signal degradation over distance, and interference from walls, other devices, or even weather. You’ll learn how to interpret RSSI (Received Signal Strength Indicato...

Every device platform—whether Cisco, Juniper, or another—has its own diagnostic approach. In this episode, we explore common troubleshooting techniques across routers and switches, focusing on interface states, routing tables, and platform-specific commands. You’ll learn how to interpret “up/down” messages, diagnose err-disabled ports, and use commands like show ip route, show interfaces, and debu...

Some of the most essential network management tools are also the most overlooked. This episode covers infrastructure tools such as TFTP servers for file transfers, terminal emulators like PuTTY and SecureCRT for CLI access, and core diagnostic commands including ping, traceroute, ipconfig, and netstat. You’ll learn how these tools assist with configuration backups, firmware upgrades, and remote di...

Network visibility starts with knowing what’s on your network. In this episode, we explain network discovery techniques using tools like ping sweeps, SNMP queries, and Nmap scans to identify devices, operating systems, and open services. You’ll learn how to distinguish active vs. passive discovery methods, the importance of using up-to-date inventories, and how to prevent disruptions while scannin...

To truly understand what’s happening on the network, you need to inspect the packets themselves. This episode introduces tools like Wireshark, tcpdump, and protocol analyzers that allow you to capture and analyze live traffic. You’ll learn how to filter by IP, port, or protocol, and how to identify patterns like retransmissions, failed handshakes, or application-layer issues. We also cover port mi...

Wireless networks introduce a layer of complexity that often demands specialized tools for visibility. In this episode, we cover wireless troubleshooting utilities including site survey tools, spectrum analyzers, and signal heatmaps. These help you diagnose issues like dead zones, co-channel interference, and excessive client density. We also explore throughput testing and bandwidth analysis techn...

Fiber requires a different class of diagnostic tools due to its precision and sensitivity. In this episode, we cover devices like OTDRs (Optical Time Domain Reflectometers), power meters, and visual fault locators. You’ll learn how these tools detect breaks, signal loss, and connector issues with pinpoint accuracy. OTDRs, for example, send pulses of light and measure reflections to map out the fib...

Troubleshooting starts with the right tools. In this episode, we walk through the essential cable testing and installation tools you’ll use on the job. These include crimpers for RJ-45 connectors, punchdown tools for keystone jacks and patch panels, and continuity testers for verifying wire maps. You’ll also learn how cable locators and tone generators help identify cables behind walls or in crowd...

Link-level problems are easy to overlook but frequently cause intermittent issues. This episode explores duplex mismatches—where one device is set to full duplex and the other to half—leading to collisions, retransmissions, and degraded performance. We explain how to spot and correct these mismatches using port configuration and interface statistics. We also examine the diagnostic value of physica...

Even a well-designed network can experience hardware or cabling faults over time. This episode breaks down common problems such as broken connectors, bent pins, cable kinks, and worn insulation. We explain how these physical issues translate into dropped packets, CRC errors, and link flapping. Recognizing these symptoms early helps prevent widespread outages. We also cover faulty hardware includin...

Cable problems can often look like application issues, but they require a different kind of troubleshooting. In this episode, we review cable specifications like length limits, signal loss, impedance, and interference resistance. You'll learn how to recognize mismatches between cable category and intended use, such as trying to run 10 Gbps over Cat 5e or exceeding fiber distance ratings. We also t...

Once you’ve confirmed the cause of a network issue, it's time to solve it. This episode covers the final stages of the troubleshooting methodology: establishing a plan of action, implementing the solution, verifying functionality, and documenting everything. You’ll learn how to evaluate risk before making changes, how to plan rollback strategies, and how to confirm that your fix didn’t break somet...

The foundation of effective troubleshooting is a structured approach. In this episode, we introduce the CompTIA troubleshooting methodology, focusing on the first few steps: identifying the problem, establishing a theory of probable cause, and testing that theory. You'll learn how to ask the right questions, collect information from logs and users, and avoid jumping to conclusions. Proper problem...

In this final domain, we turn our focus to troubleshooting—a skill that ties together everything you’ve learned so far. This episode introduces Domain 5 and outlines the key areas it covers, including troubleshooting methodology, cable testing, routing diagnostics, wireless issues, and performance analysis. Unlike previous domains that focused on setup and design, this one is about identifying and...