Episode 64: ICMP — The Network's Messaging System

This episode examines the Internet Control Message Protocol (ICMP), which communicates error messages and diagnostic information between devices. ICMP is not used to transmit application data but instead supports functions like destination unreachable, time exceeded, and echo request/reply. It is heavily featured in the exam because tools like ping and traceroute rely on ICMP, making it central to troubleshooting connectivity.

Real-world applications include identifying whether a host is reachable, mapping network paths, and detecting packet loss. Troubleshooting examples include recognizing when ICMP is blocked by firewalls or when excessive ICMP traffic indicates a potential denial-of-service attack. By mastering ICMP, you’ll understand both its legitimate diagnostic uses and its potential abuse, preparing you for exam questions and professional network management. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your certification path.