Certified - CompTIA Network + Audio Course

Security tools can’t catch every threat—but informed users often can. This episode looks at the balance between technical detection methods and user-driven prevention. We start by examining detection tools like antivirus, IDS/IPS, SIEM platforms, and anomaly-based monitoring. You’ll learn how these systems generate alerts, how tuning reduces false positives, and how incident escalation paths are d...

While cyber defenses are critical, physical security is just as important. In this episode, we explain how physical access controls protect infrastructure from unauthorized tampering, theft, or sabotage. You’ll learn about badge systems, biometrics, mantraps, camera placement, and hardware locks. These controls help restrict access to wiring closets, server rooms, and device enclosures. We also co...

Wireless networks require layered security controls to keep unauthorized users out and ensure a clean client experience. In this episode, we cover advanced wireless protections including MAC filtering, client isolation, and captive portals. MAC filtering adds a basic layer of access control by allowing or denying clients based on their hardware addresses, though it must be combined with other cont...

Firewalls and access control lists are the gatekeepers of your network, and understanding how to configure them correctly is essential. This episode explains how to structure firewall rules and ACLs (Access Control Lists) using principles like implicit deny, least privilege, and rule order. You'll learn how rules are evaluated top-down and why a misplaced permit or deny can either expose sensitive...

Securing the network starts with securing its devices. In this episode, we focus on hardening best practices for routers, switches, and firewalls. This includes disabling unused interfaces, enforcing strong password policies, and limiting access with ACLs and administrative timeouts. We also explore remote access security—ensuring SSH replaces Telnet, enabling HTTPS instead of HTTP, and monitoring...

Advanced network protection mechanisms focus on securing internal traffic and device behavior. This episode introduces three such features: Dynamic ARP Inspection (DAI), DHCP Snooping, and Control Plane Policing (CoPP). DAI helps detect and block ARP spoofing attempts by validating ARP packets against known trusted entries. This is especially important in VLAN-segmented environments where one comp...

Hardening your network means reducing its attack surface and securing its services. In this episode, we look at three high-priority hardening practices: securing SNMP, managing router advertisements, and implementing port security. You’ll learn how to disable or reconfigure SNMPv1/v2 in favor of SNMPv3, ensuring encrypted and authenticated device monitoring. Misconfigured SNMP can expose internal...

Security doesn’t stop at the firewall—physical access and social manipulation play a major role in network compromise. In this episode, we explore phishing in its many forms, including spear phishing, whaling, and smishing (SMS-based phishing). You’ll learn how attackers use psychological manipulation and trust to trick users into revealing credentials, clicking malicious links, or running unsafe...

Some of the most dangerous network threats don’t rely on malware—they rely on deception. In this episode, we explore IP spoofing, a method where attackers forge source IP addresses to disguise their origin or impersonate trusted devices. You’ll learn how spoofed packets can bypass access controls, flood systems, or launch man-in-the-middle and amplification attacks. We also examine deauthenticatio...

Malicious software remains one of the most common and destructive threats to networks and users alike. In this episode, we examine different types of malware, focusing on ransomware, spyware, and trojans—each with unique goals and attack vectors. You’ll learn how ransomware encrypts data and demands payment, often targeting entire organizations with devastating speed. We also cover how malicious p...

When devices pretend to be something they’re not, serious security problems can follow. This episode focuses on spoofing attacks—specifically ARP spoofing and MAC address spoofing—that allow attackers to intercept or redirect traffic within a local network. You’ll learn how ARP spoofing poisons the ARP table of nearby devices to reroute traffic through a malicious host. We also explain MAC spoofin...

VLANs offer segmentation—but they’re not invulnerable. In this episode, we look at how attackers can bypass VLAN boundaries using VLAN hopping techniques like double-tagging and switch spoofing. You’ll learn how misconfigured trunk ports, native VLANs, and default switch behaviors create opportunities for unauthorized access between VLANs. We also explore other Layer 2 vulnerabilities, including M...

On-path attacks, formerly known as man-in-the-middle attacks, are some of the most dangerous network threats. In this episode, we explain how attackers insert themselves into the communication path between devices to intercept, modify, or impersonate data. You’ll learn about ARP spoofing, rogue gateways, and SSL stripping—each with their own vector and risk level. These attacks are difficult to de...

Denial-of-Service attacks aim to disrupt services by overwhelming a system’s resources—and understanding how they work is key to protecting against them. This episode covers the types of DoS attacks, including protocol, volumetric, and application-layer variants. We then examine how Distributed DoS (DDoS) attacks scale the damage by launching traffic from multiple compromised systems, often part o...

Every security decision is about balancing risk, and in this episode, we dive into how organizations identify, measure, and manage those risks. You’ll learn the components of a risk management framework, including risk identification, assessment, mitigation, and ongoing monitoring. We explain the difference between qualitative and quantitative assessments and how they guide policy decisions, inves...

802.1X is the gatekeeper of modern enterprise networks, ensuring only authenticated users and devices can connect. This episode explains how 802.1X works as a port-based network access control mechanism, acting as the foundation for many secure wireless and wired deployments. You’ll learn about the three roles in 802.1X: the supplicant (client), the authenticator (switch or access point), and the...

Centralized authentication simplifies user management while enhancing security. In this episode, we compare two core protocols—TACACS+ and RADIUS—and explain their roles in authenticating access to network infrastructure devices. You’ll learn how TACACS+ provides command-level control and full separation of authentication, authorization, and accounting, while RADIUS is more common in end-user acce...

Beyond basic firewalls and access controls, advanced security mechanisms offer deeper visibility and proactive defense. In this episode, we explore Network Access Control (NAC), a system that evaluates a device’s health and compliance status before granting access to the network. NAC solutions can quarantine non-compliant systems, require updates, or redirect them to remediation zones. We explain...

Zero Trust networking flips the traditional perimeter-based security model on its head. In this episode, we unpack the Zero Trust principle of “never trust, always verify,” and explore how it applies to network design. You’ll learn how Zero Trust assumes breach by default and demands continuous authentication, authorization, and monitoring regardless of whether a user or device is internal or exte...

Security in networking isn’t just about blocking attacks—it’s about minimizing exposure by limiting what users and systems can access. In this episode, we examine the Principle of Least Privilege (PoLP), which states that users should have only the access they need to perform their duties—no more, no less. You’ll learn how this concept applies not only to user accounts but also to devices, applica...

This episode dives into the foundational security concepts of vulnerabilities, exploits, and exposures—terms that appear throughout the Network Plus exam and underpin much of what cybersecurity involves. We begin by defining what constitutes a vulnerability, whether it’s a flaw in software, a misconfiguration in hardware, or a weakness in protocol design. From there, we explain what an exploit is:...

Every security strategy begins with the CIA Triad—Confidentiality, Integrity, and Availability. In this episode, we explore how these three principles guide all security policies and how various threats can undermine each one. Confidentiality threats include unauthorized access and data breaches. Integrity threats involve tampering, spoofing, or unauthorized changes. Availability threats include D...

Domain 4 marks a transition from availability and performance into security—protecting the integrity and confidentiality of the network. In this episode, we introduce the core topics that make up Network Security, including authentication, access control, attack types, and hardening techniques. The goal of this domain is to teach you how to prevent, detect, and respond to threats at every layer of...

Configuration data is as critical as hardware—and losing it can lead to hours of downtime. In this episode, we walk through backup and restore procedures for routers, switches, firewalls, and other network appliances. You’ll learn how to use TFTP, FTP, or USB-based methods to copy and store configurations, and how to schedule automated backups using cron jobs or built-in tools. We also cover best...

Routers are essential gateways, and if one fails, the network can grind to a halt—unless redundancy is in place. This episode explores VRRP (Virtual Router Redundancy Protocol) and other First Hop Redundancy Protocols (FHRPs) that allow multiple routers to share the same virtual IP address. You’ll learn how a “master” router handles active traffic while backups wait to take over seamlessly in the...