Learn To Hack

ARP – Address Resolution Protocol or ARP for short, is the technology that is responsible for allowing devices to identify themselves on a network. ARP allows a device to associate its MAC address with an IP address on the network.

Client – A client is a device or software that requests services or resources from a server, which is a system that provides those services or resources. This relationship allows for efficient data management and resource sharing over a network. 

CPU – CPU is short for Central Processing Unit. This is the primary engine or “brain” of a computer. It interprets and executes instructions from hardware and software.

DHCP – Dynamic Host Configuration Protocol or DHCP for short is a network management protocol that automatically assigns IP addresses and other configuration settings to devices on a network, eliminating the need for manual setup.

Encapsulation – Encapsulation in networking is the process of wrapping data with protocol-specific headers and trailers as it moves down the OSI or TCP/IP model layers, enabling structured, modular, and secure communication. It acts like a digital envelope, where each layer (e.g., Transport, Network) adds control information needed for delivery, allowing higher layers to remain independent of lower-level complexities.

Firewall – A firewall is a device within a network responsible for determining what traffic is allowed to enter or exit. Think of a firewall as the guard at the door of a nightclub. (where the nightclub is your network)

Frames – A frame is the basic unit of data at the Data Link Layer (Layer 2) that encapsulates a network packet (like an IP packet) with addressing (MAC addresses) and error-checking info, creating a complete package for transmission across a single local network segment, like an Ethernet. It’s like an envelope (the frame) holding a letter (the packet) with a local delivery address (MAC) to get it to the next hop (like a router or switch) on the way to its final destination.

GPU – GPU is short for Graphics Processing Unit. It is a specialized electronic circle designed for rapid image processing, rending, and manipulating 3D graphics.

GUI – Graphical User Interface or GUI for short, is the technical term given to the name of the software that users interact with. 

Hardware – Is the psychical, tangible components of a computer system or electronic device that can be touched and seen.

Host – A host is a computer or server, that connects to a network and can send or receive data, services, and applications. Hosts require an IP address to function and can act as either clients or servers in a network.

ICMP – ICMP is short for Internet Control Message Protocol and it is a network-layer protocol used by devices to send error messages and operational information about IP packet delivery. It helps diagnose network issues and is used by tools like ping and traceroute.

IDS – IDS is short for Intrusion Detection System. An IDS is a network security tool that monitors network traffic for malicious activity or policy violations, alerting administrators to potential threats. It can be implemented as software or hardware.

IP Address – IP is short for Internet Protocol. It is a unique, numerical label (identifier) assigned to every device (computer, printer, phone) connected to a network that used the Internet Protocol (IP) for communications. It acts as a digital address, identifying devices and allowing them to send/receive data, such as websites or emails, across the internet.

LAN – A Local Area Network (LAN) is a network of computers and devices connected within a limited, specific, and local geographical area, such as a home, office, or school building. LANs, which often use Ethernet or Wi-Fi to connect devices like computers, printers, and servers, allow for high-speed data sharing and internet access. 

MAC Address – MAC is short for Media Access Control. It is a unique, 12-digit hexadecimal identifier permanently assigned to a device’s network interface controller (NIC) by the manufacturer. It functions as a physical, hardware-level “fingerprint” or address for devices (like WiFi cards, Ethernet adapters) on a local network, ensuring data reaches the correct destination.

Network – A computer network is a collection of two or more interconnected computing devices – such as computers, servers, smartphones, and printers – that share data and resources. Connected via cables or wireless signals, these systems allow for file sharing, internet access, and communication.

NIC – NIC is short for Network Interface Card. This can sometimes be called a Network Interface Controller, Adapter, or LAN adapter. It is a hardware component, either a circuit board or chip, that connects a computer to a computer network. It facilitates data transmission and communication, enabling devices to connect via wired (Ethernet) or wireless (Wi-Fi) technologies.

Nmap – Nmap is short for Network Mapper and it is a free, open-source tool for network discover, inventory, and security auditing. It enables cybersecurity professionals and network administrators to identify active hosts, open ports, available services (names and versions), and operating systems, as well as detect potential security risks.

OSI Model – The OSI model, or Open Systems Interconnection model, is a framework that divides network communication into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. It helps standardize how different systems communicate over a network, making troubleshooting and interoperability easier. 

Operating System (OS) – OS is short for Operating System. It is the essential system software that manages a computer’s hardware, memory, processes, and applications, acting as an intermediary between the user and the computer.

Packet – A packet is a small, formatted chunk of data that travels across networks, like the internet, carrying a piece of a larger message, image, or video. Each packet contains both the actual data (payload) and crucial control information (header/trailer) with source/destination addresses, sequence numbers, and error-checking, allowing devices to send, route, and reassemble data efficiently, preventing network congestion.

Port – A port or Network Port is a virtual, software-based endpoint (identified by a number from 0 to 65535) that manages specific communication channels on a computer. It allows operating systems to direct network traffic to specific services (e.g. port 80 for web browsing) and enables multiple applications to use a single network connection simultaneously.

Process – Processes are the programs that are running on your machine. They are managed by the kernel, where each process will have an ID associated with it, also known as its PID. The PID increments for the order in which the process starts. I.e. the 30th process will have a PID of 30. 

RAM – RAM is short for Random Access Memory and it acts as a computer’s high-speed short term memory used to temporarily store active data and machine code for immediate access by the CPU. It enables fast read/write speed for running applications and OS tasks, but it is volatile, meaning data is lost when power is turned off.

Router – A router is a networking device that connects multiple, separate networks together – such as connecting a home local area network (LAN) to the internet (a wide area network or WAN). It acts as a traffic director, managing data packets by determining the best path for information to travel between devices and the internet.

Software – is a collection of instructions, data or programs used to operate computers and execute specific tasks.

SSH – Secure Shell or SSH for short is a cryptographic network protocol for operating network services securely over an unsecured network. It provides a secure, encrypted connection between a client and a remote server, making it possible to manage systems, execute commands, and transfer files remotely as if the user were physically present.

Subnetting – Subnetting is the term given to splitting up a network into smaller, miniature networks within itself.

Switch – A network switch is a hardware device that connects multiple devices—such as computers, printers, and servers—within a local area network (LAN). Operating at the data-link layer (Layer 2) of the OSI model, it improves network efficiency by using MAC addresses to send data packets directly to the specific intended device, rather than broadcasting it to all connected devices.

TCP –Transmission Control Protocol or TCP for short, is a fundamental, connection-oriented transport protocol that ensures reliable, ordered, and error-checked delivery of data packets between applications on an IP network. Operating at the Transport Layer (Layer 4), it establishes a connection via a three-way handshake and manages data integrity through sequencing and acknowledgments, making it essential for web browsing (HTTP), email (SMTP), and file transfers. 

Topology – Topology is referring to the design or look of the network at hand. It refers to the physical or logical arrangement of devices and connections in a network

UDP – User Datagram Protocol or UDP for short, is a connectionless communication protocol for transporting packets across networks.

VPN – A Virtual Private Network or VPN for short, is a technology that allows devices on separate networks to communicate securely by creating a dedicated path between each other over the Internet (known as a tunnel). Devices connected within this tunnel form their own private network.

WiFi – WiFi is short for Wireless Fidelity. It is a wireless network technology that uses radio waves to provide high-speed internet access.