Technology9

Tag: network security

  • Iptables

    Iptables is a powerful command-line utility used to configure and manage the Linux kernel’s built-in netfilter firewall. It provides granular control over incoming, outgoing, and forwarded network traffic, making it a vital tool for system administrators to secure Linux-based systems. Iptables works by defining rules within chains, which are part of tables that specify how…

  • Tcpdump

    Tcpdump is a network packet analyzer that provides a detailed look at the network traffic flowing through a system. It is widely used by network administrators and cybersecurity professionals to capture and inspect packets to diagnose network issues, troubleshoot performance problems, and detect security breaches. Tcpdump operates from the command line and is capable of…

  • Nmap

    Nmap, short for Network Mapper, is a powerful open-source tool used for network discovery and security auditing. Developed by Gordon Lyon (also known as “Fyodor”), it has become an essential utility for network administrators, penetration testers, and cybersecurity professionals. Nmap’s capability to scan networks, identify active devices, and enumerate open ports makes it a cornerstone…

  • Packet Sniffers

    A packet sniffer, also known as a network analyzer or protocol analyzer, is a tool used to monitor, capture, and analyze data packets transmitted across a network. By intercepting network traffic, packet sniffers provide a detailed view of network activity, making them invaluable for troubleshooting, security analysis, and network optimization. How Packet Sniffers Work Packet…

  • Cyber Attacks: DNS poisoning

    DNS (Domain Name System) poisoning, also known as DNS spoofing, is a type of cyberattack that compromises the DNS resolution process, redirecting users to malicious websites without their knowledge. As a foundational element of internet navigation, DNS translates human-readable domain names into IP addresses. DNS poisoning corrupts this process, enabling attackers to intercept or manipulate…

  • Cyber security Attacks: DDOS

    A Distributed Denial of Service (DDoS) attack is a malicious attempt to disrupt the normal traffic of a targeted server, service, or network by overwhelming it with a flood of internet traffic. These attacks are orchestrated using a network of compromised devices, known as a botnet, which collectively send vast amounts of requests to the…

  • IP stack : Public IP

    A public IP address is a unique identifier assigned to a device or network that is accessible over the internet. It plays a pivotal role in the IP stack by enabling global communication between devices on different networks. Public IPs are routable across the internet, making them essential for web servers, cloud resources, and other…

  • IP Stack : Private IP

    Private IP addresses are an essential component of the Internet Protocol (IP) stack, enabling secure and efficient communication within local networks. These addresses are reserved for internal use in private networks, such as homes, offices, and data centers, and are not routable over the public internet. The Internet Assigned Numbers Authority (IANA) has designated specific…

  • Topologies: Ring Network

    In networking, the ring topology represents a structure where nodes are connected in a closed-loop or circular arrangement. Each node is connected to exactly two neighboring nodes, forming a ring-like structure. Data travels in one or both directions around the ring until it reaches its intended destination. This topology is particularly known for its simplicity…

  • IP Stack : Loopback

    The loopback interface is a fundamental component of the IP stack, enabling internal network communications within a device. It provides a mechanism for testing and debugging network services without requiring physical network hardware. The loopback interface is identified by the IP address 127.0.0.1 for IPv4 and ::1 for IPv6, both of which are reserved specifically…

  • IP stack : Subnet mask

    A subnet mask is an essential component of the IP stack used to divide an IP address into two parts: one for the network and one for the host. This concept is fundamental in network design, as it allows network administrators to manage and segment networks efficiently. The subnet mask enables devices on the same…

  • Topologies : Bus Network

    Bus topology is one of the simplest forms of network architecture, where all devices (nodes) are connected to a single central communication line known as the “bus” or backbone. This linear structure is often used in smaller networks due to its simplicity and cost-effectiveness. Data travels along the bus, and each node checks whether the…

  • Topologies: Mesh Network

    Mesh network topology is a robust and decentralized network design where each device (or node) is interconnected with one or more other nodes. This architecture ensures multiple paths for data transmission, promoting reliability, redundancy, and efficiency. Mesh networks are commonly used in critical systems such as wireless networks, IoT applications, and military communications due to…

  • Topologies : Star Network

    Star network topology is one of the most commonly used architectures in modern networking. In this design, all devices (nodes) are connected to a central hub or switch, which acts as the primary point for communication. This centralized structure simplifies management, improves performance, and ensures efficient data routing, making star topology ideal for both small-scale…

  • Risk Mitigation: Security Incident Handling

    Security incident handling is a critical facet of risk mitigation, ensuring swift response and containment of cyber threats. Effective security incident handling minimizes financial losses, protects sensitive data, and safeguards organizational reputation. This process is multi-dimensional, requiring a blend of proactive planning, real-time monitoring, and post-incident analysis. Core Components of Security Incident Handling 1. Preparation:Effective…

  • Security Groups

    In AWS, Security Groups act as virtual firewalls to control inbound and outbound traffic to your EC2 instances, ensuring that only authorized access occurs while protecting your cloud infrastructure from potential threats. They are stateful, meaning that if you allow inbound traffic, the response is automatically allowed, regardless of outbound rules. This guide will walk…

  • IDS : Infra security POV

    An Intrusion Detection System (IDS) is a fundamental component of infrastructure security, designed to monitor network traffic and system activities for signs of malicious behavior or policy violations. By identifying potential threats in real-time, IDS enhances the resilience of an organization’s digital infrastructure, acting as a proactive measure against cyberattacks. This article explores IDS from…

  • Identify Access Management: Infra Security POV

    Identity and Access Management (IAM) is a critical pillar in the foundation of infrastructure security, ensuring that the right individuals and entities access the right resources at the right time, for the right reasons. By enforcing granular control over authentication, authorization, and auditing processes, IAM fortifies an organization’s defenses against unauthorized access, insider threats, and…

  • IPS : Infra security POV

    An Intrusion Prevention System (IPS) is a cornerstone of modern infrastructure security, designed to identify, analyze, and block potential threats in real-time. Operating as an active defense mechanism, an IPS not only detects malicious activities but also takes decisive action to neutralize threats before they can exploit system vulnerabilities. This proactive approach makes it an…

  • TLS 1.3 (Transport Layer Security)

    TLS 1.3 (Transport Layer Security): An In-Depth Analysis Transport Layer Security (TLS) is a cryptographic protocol designed to provide secure communication over a computer network. TLS 1.3 is the latest version of the protocol, significantly improving both security and performance compared to its predecessors. It was officially published by the IETF (Internet Engineering Task Force)…

  • TLS 1.2 ( Transport Layer Security)

    TLS 1.2 (Transport Layer Security): A Deep Dive into Its Architecture and Mechanisms Transport Layer Security (TLS) is a cryptographic protocol designed to provide secure communication across computer networks, such as the Internet. TLS 1.2, an important version of the TLS protocol, was introduced in 2008 and became the de facto standard for securing data…

  • SSL Bridging

    SSL bridging is a sophisticated process in network security where SSL (Secure Sockets Layer) encryption is terminated at an intermediary, typically a load balancer, which decrypts and re-encrypts traffic before forwarding it to backend servers. Unlike SSL offloading, SSL bridging allows for secure, end-to-end encrypted communication across the network, enhancing data security while offering flexibility…