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What Is MQTT and Why Do IoT Devices Use It?
MQTT is a lightweight publish-subscribe protocol designed for IoT devices. Learn how brokers and topics work, what QoS levels mean, and why unencrypted MQTT is a security risk.
What Is MQTT and Why Do IoT Devices Use It?
MQTT is a lightweight publish-subscribe protocol designed for IoT devices. Learn how brokers and topics work, what QoS levels mean, and why unencrypted MQTT is a security risk.
What Is QoS (Quality of Service)?
QoS prioritizes time-sensitive traffic like voice and video over bulk downloads. Learn how DSCP marking, traffic queuing, and WiFi WMM work to manage congestion.
What Is QoS (Quality of Service)?
QoS prioritizes time-sensitive traffic like voice and video over bulk downloads. Learn how DSCP marking, traffic queuing, and WiFi WMM work to manage congestion.
What Is a Network Socket?
A socket combines an IP address and port into a communication endpoint. Learn how stream, datagram, and raw sockets work and why every network connection uses them.
What Is a Network Socket?
A socket combines an IP address and port into a communication endpoint. Learn how stream, datagram, and raw sockets work and why every network connection uses them.
What Are Network Topologies?
Network topologies define how devices connect - star, bus, ring, mesh, and hybrid. Learn the trade-offs of each and where they appear in modern networks.
What Are Network Topologies?
Network topologies define how devices connect - star, bus, ring, mesh, and hybrid. Learn the trade-offs of each and where they appear in modern networks.
What Is TLS and How Does It Secure Connections?
TLS encrypts data between endpoints using cipher suites, certificates, and key exchange. Learn how the TLS handshake works, what changed in TLS 1.3, and why forward secrecy matters.
What Is TLS and How Does It Secure Connections?
TLS encrypts data between endpoints using cipher suites, certificates, and key exchange. Learn how the TLS handshake works, what changed in TLS 1.3, and why forward secrecy matters.
Frequency vs Wavelength: What Is the Relationship?
Frequency and wavelength are inversely related. Learn how this relationship affects antenna design, obstacle penetration, and wireless range.
Frequency vs Wavelength: What Is the Relationship?
Frequency and wavelength are inversely related. Learn how this relationship affects antenna design, obstacle penetration, and wireless range.
What Is RF (Radio Frequency)?
Radio frequency energy carries all wireless communication. Learn how RF propagates, why the 2.4GHz band is so crowded, and how frequency determines wireless behavior.
What Is RF (Radio Frequency)?
Radio frequency energy carries all wireless communication. Learn how RF propagates, why the 2.4GHz band is so crowded, and how frequency determines wireless behavior.
The Electromagnetic Spectrum Explained
From radio waves to gamma rays - where WiFi, Bluetooth, and IR sit on the electromagnetic spectrum and how frequency determines signal behavior.
The Electromagnetic Spectrum Explained
From radio waves to gamma rays - where WiFi, Bluetooth, and IR sit on the electromagnetic spectrum and how frequency determines signal behavior.
What Is Subnetting and CIDR Notation?
Subnetting divides IP ranges using CIDR notation like 192.168.1.0/24. Learn how to calculate network addresses, broadcast addresses, and usable host ranges.
What Is Subnetting and CIDR Notation?
Subnetting divides IP ranges using CIDR notation like 192.168.1.0/24. Learn how to calculate network addresses, broadcast addresses, and usable host ranges.
What Is IPv6 and Why Does It Exist?
IPv6 replaces IPv4 with 128-bit addresses, eliminating address exhaustion and NAT. Learn how the address format works, what NDP does, and why the transition has been slow.
What Is IPv6 and Why Does It Exist?
IPv6 replaces IPv4 with 128-bit addresses, eliminating address exhaustion and NAT. Learn how the address format works, what NDP does, and why the transition has been slow.
What Is a MAC Address?
A MAC address is the 6-byte hardware identifier on every network interface. Learn how OUI and device ID work, how MAC addresses are used in frames, and why spoofing is...
What Is a MAC Address?
A MAC address is the 6-byte hardware identifier on every network interface. Learn how OUI and device ID work, how MAC addresses are used in frames, and why spoofing is...
What Is a VLAN?
VLANs segment networks logically without physical separation. Learn how 802.1Q tagging works, why IoT devices belong on their own VLAN, and how VLAN attacks work.
What Is a VLAN?
VLANs segment networks logically without physical separation. Learn how 802.1Q tagging works, why IoT devices belong on their own VLAN, and how VLAN attacks work.
What Is a Port Number?
Port numbers identify services on a host, from HTTP (80) to SSH (22). Learn the difference between well-known, registered, and ephemeral ports and why they matter for security.
What Is a Port Number?
Port numbers identify services on a host, from HTTP (80) to SSH (22). Learn the difference between well-known, registered, and ephemeral ports and why they matter for security.
What Is HTTP and How Does It Work?
HTTP is the request-response protocol that powers the web. Learn how methods, status codes, and headers work, why HTTP is stateless, and what changed from HTTP/1.0 to HTTP/3.
What Is HTTP and How Does It Work?
HTTP is the request-response protocol that powers the web. Learn how methods, status codes, and headers work, why HTTP is stateless, and what changed from HTTP/1.0 to HTTP/3.
What Is ARP and How Do Devices Find Each Other ...
ARP maps IP addresses to MAC addresses on local networks. Learn how ARP requests and the ARP cache work, and why this unauthenticated protocol enables spoofing attacks.
What Is ARP and How Do Devices Find Each Other ...
ARP maps IP addresses to MAC addresses on local networks. Learn how ARP requests and the ARP cache work, and why this unauthenticated protocol enables spoofing attacks.
What Is ICMP and How Does Ping Work?
ICMP powers ping and traceroute. Learn how echo requests work, what traceroute reveals about network paths, and why ICMP is both a diagnostic tool and an attack surface.
What Is ICMP and How Does Ping Work?
ICMP powers ping and traceroute. Learn how echo requests work, what traceroute reveals about network paths, and why ICMP is both a diagnostic tool and an attack surface.
TCP vs UDP: What Is the Difference?
TCP guarantees reliable, ordered delivery. UDP trades reliability for speed. Learn how each protocol works, when to use which, and why security tools often prefer UDP for time-sensitive operations.
TCP vs UDP: What Is the Difference?
TCP guarantees reliable, ordered delivery. UDP trades reliability for speed. Learn how each protocol works, when to use which, and why security tools often prefer UDP for time-sensitive operations.
What Is CSMA/CD and How Did Ethernet Handle Col...
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is how early Ethernet handled multiple devices sharing the same wire. Learn how collision detection works, why switches made it obsolete, and...
What Is CSMA/CD and How Did Ethernet Handle Col...
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is how early Ethernet handled multiple devices sharing the same wire. Learn how collision detection works, why switches made it obsolete, and...
What Is the TCP/IP Model? The Four Layers That ...
The TCP/IP model is the four-layer architecture that underpins every internet connection. Learn what each layer does, how data flows through them, and how TCP/IP compares to the seven-layer OSI...
What Is the TCP/IP Model? The Four Layers That ...
The TCP/IP model is the four-layer architecture that underpins every internet connection. Learn what each layer does, how data flows through them, and how TCP/IP compares to the seven-layer OSI...
DuckyScript for Automation: Using Bad-BT as a P...
Bad-BT on the BLEShark Nano isn't only a security testing tool. DuckyScript payloads can automate repetitive tasks with a single button press. Here's how that works.
DuckyScript for Automation: Using Bad-BT as a P...
Bad-BT on the BLEShark Nano isn't only a security testing tool. DuckyScript payloads can automate repetitive tasks with a single button press. Here's how that works.
How the ESP32 Handles WiFi and BLE Simultaneously
The ESP32-C3 has one radio. Here's how it manages WiFi and BLE at the same time - and where the limits are.
How the ESP32 Handles WiFi and BLE Simultaneously
The ESP32-C3 has one radio. Here's how it manages WiFi and BLE at the same time - and where the limits are.
What Is Ethical Hacking? The Career Path Explained
Ethical hacking is authorized security testing for a living. Here's what the career actually looks like, what certs matter, and how to get started.
What Is Ethical Hacking? The Career Path Explained
Ethical hacking is authorized security testing for a living. Here's what the career actually looks like, what certs matter, and how to get started.
Building a Custom Captive Portal Page for BLESh...
BLEShark Nano serves any HTML page you upload as its captive portal. Here's how to build one, what the submission system looks like, and practical examples for security demos.
Building a Custom Captive Portal Page for BLESh...
BLEShark Nano serves any HTML page you upload as its captive portal. Here's how to build one, what the submission system looks like, and practical examples for security demos.
Using BLEShark Nano as a TikTok Scroller and Me...
The BLEShark Nano isn't only a security tool. Its BLE HID capability makes it a pocket-sized media controller, TikTok scroller, and keyboard shortcut launcher.
Using BLEShark Nano as a TikTok Scroller and Me...
The BLEShark Nano isn't only a security tool. Its BLE HID capability makes it a pocket-sized media controller, TikTok scroller, and keyboard shortcut launcher.