The OSI Model & TCP/IP Model

The Open Systems Interconnection (OSI) model is a generic reference to understanding how computers communicate with each other. It's not meant to be an exact science, but rather a guide to help us visualize what happens during node-to-node communication. I once made a post on the OSI model before, but it was lacking detail. There... Continue Reading →

How Does DHCP Work?

Dynamic Host Configuration Protocol, or DHCP, is used to provide quick and centralized management of IP addresses and other TCP/IP settings on your network. These are things like host IP address, subnet mask, DNS settings, default gateway address, and so on (I call these "IP configuration settings"). When you power on your computer, a DHCP... Continue Reading →

Firewalls: A Fundamental Introduction

The defense in-depth design is a security philosophy that proposes we protect our assets and networks with multiple levels of security. The idea is not strictly limited to technical security controls, as management and operational controls have their rightful place in the defense in-depth approach. However, many aspiring and enthusiastic young learners falsely attribute the... Continue Reading →

PenTest Edition: Wireshark

Wireshark is a GUI, cross-platform, open-source protocol and packet analyzer available for Microsoft Windows, Linux, Mac OS, BSD, Solaris, and some other Unix-like operating systems. As a packet analyzer, Wireshark's functionality includes network troubleshooting, packet capture analysis, real-time network traffic observation, examining security problems, protocol implementation debugging, and reconnaissance. If you're already familiar with tcpdump or... Continue Reading →

Intrusion Detection and Prevention Systems

The process of intrusion detection involves the monitoring of systems or networks for any signs and occurrences of events or incidents deemed either suspicious or in violation of to an organization's security policy or rule set. An "Intrusion Detection System (IDS)" is a hardware appliance or software that has the ability to detect signs of... Continue Reading →

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