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In cellular communications, handoff (also called handover) is the process of transferring an active call or data session from one cell in a cellular network to another, or from one channel to another. In satellite communications, it is the process of transferring control from one earth station to another. Handoff is essential for preventing loss of service or interruption to a caller or data session user as they move through the network. Mobile Handoff Process Cell A (Current) Cell B (Target) ... Read More
TheZoo is an open-source repository that provides cybersecurity researchers and malware analysts with access to live malware samples for educational and research purposes. It enables the study of malware behavior, analysis techniques, and development of countermeasures in a controlled environment. TheZoo contains a comprehensive collection of malware samples categorized by family, type, and platform. This repository serves as a valuable resource for security professionals, researchers, and students who need to understand how malicious software operates and spreads. Installation and Setup To set up TheZoo repository on your system, follow these steps: git clone https://github.com/ytisf/theZoo cd ... Read More
Remote Procedure Call (RPC) Message Protocol is a high-level communication protocol that enables a client to execute procedures on a remote server as if they were local function calls. RPC abstracts the complexity of network communication, allowing distributed applications to interact seamlessly across different systems. Unlike low-level protocols such as TCP/IP or UDP that handle basic data transport, RPC provides a more intuitive programming interface. When a client makes an RPC request, it can receive responses from multiple remote systems, making it ideal for distributed computing environments. RPC Message Protocol Flow ... Read More
Wireless/Mobile computing encompasses various technologies that enable communication and data transfer without physical cable connections. Mobile communication technologies form the backbone of modern wireless systems, allowing devices to connect and communicate across vast distances. Wireless Communication Technologies GSM TDMA CDMA Code Division WLL Wireless Loop GPRS Packet Data SMS Text Messaging GSM (Global System for Mobile Communication) ... Read More
A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between trusted internal networks and untrusted external networks, filtering data packets to prevent unauthorized access and cyber threats. Firewalls examine each data packet against configured rules to determine whether to allow, block, or drop the traffic. They can be implemented as hardware appliances, software applications, or cloud-based services. Firewall Network Protection Internal Network (Trusted) ... Read More
Penetration testing using Docker provides security professionals with an efficient way to deploy and test vulnerable applications in isolated environments. Docker containers offer a clean, reproducible setup for security assessments without affecting the host system. Docker is a containerization platform that packages applications with all their dependencies into lightweight, portable containers. This makes it ideal for quickly setting up vulnerable web applications like DVWA (Damn Vulnerable Web Application) for penetration testing practice. Installing Docker Before setting up vulnerable applications, install Docker on your system using these commands: apt update apt install docker.io systemctl start docker ... Read More
Twisted pair cable is a type of guided transmission media consisting of two insulated copper conductors twisted together in a helical pattern. The twisting reduces electromagnetic interference and crosstalk between adjacent wire pairs, making it one of the most widely used cables in networking. Each wire in the pair carries the same signal but with opposite polarity. The receiver detects the difference between the two signals, effectively canceling out any external noise that affects both wires equally. The number of twists per inch determines the cable's quality and noise immunity. Twisted Pair Cable Structure ... Read More
IPv6 (Internet Protocol version 6) is the latest version of the Internet Protocol, designed to replace IPv4 as the primary communication method that identifies and locates devices on networks. It provides enhanced addressing capabilities, improved security features, and better performance compared to its predecessor. IPv4 uses a 32-bit addressing scheme that supports approximately 4.3 billion unique addresses, which seemed adequate when it was developed. However, the explosive growth of the Internet, personal computers, smartphones, and IoT devices has created an urgent need for more IP addresses than IPv4 can provide. Recognizing this limitation, the Internet Engineering Task Force ... Read More
A firewall is a network security system that acts as a protective barrier between a trusted internal network and untrusted external networks like the internet. It monitors and controls incoming and outgoing network traffic based on predetermined security rules, filtering data packets to allow or block them according to the organization's security policy. Firewall System Architecture Internet Perimeter Router Firewall ... Read More
Go-Back-N protocol, also called Go-Back-N Automatic Repeat reQuest, is a data link layer protocol that uses a sliding window method for reliable and sequential delivery of data frames. It is a case of sliding window protocol having to send window size of N and receiving window size of 1. Working Principle Go-Back-N ARQ provides for sending multiple frames before receiving the acknowledgment for the first frame. The frames are sequentially numbered and a finite number of frames. The maximum number of frames that can be sent depends upon the size of the sending window. If the acknowledgment of ... Read More