Network security Study Guide

Computer systems and networks can have weaknesses, known as vulnerabilities, which malicious actors can exploit to gain unauthorized access, cause damage, or disrupt services. Identifying these vulnerabilities is the crucial first step in securing any system. This involves systematically searching for flaws in software code, network configurations, hardware design, or even human processes that could be compromised. Common types of vulnerabilities include insecure configurations, software bugs, design flaws, and outdated security protocols. Once vulnerabilities are identified, various strategies are employed for prevention. These strategies can be technical, such as implementing strong firewalls, using encryption, regularly patching software, and employing intrusion detection systems. They can also be procedural, involving user education on safe practices, implementing strict access control policies, and performing regular security audits. Effective prevention requires a multi-layered approach, addressing both technical weaknesses and human factors, to build a robust defence against potential threats. Continuous monitoring and adaptation are essential as new threats and vulnerabilities emerge regularly, making security a dynamic and ongoing process.

Computer systems and networks face a multitude of threats that can compromise their security, integrity, and availability. These threats can originate from various sources, including malicious actors, accidental events, and environmental factors. Key threats include malware, which encompasses viruses, worms, and spyware, designed to infect systems and perform harmful actions. Phishing attempts trick users into revealing sensitive information, often through deceptive emails or websites. Brute force attacks involve systematically trying many password combinations until the correct one is found, while denial-of-service (DoS) attacks overwhelm a system's resources, making it unavailable to legitimate users. Data interception and theft involve unauthorised access to and extraction of sensitive data. SQL injection exploits vulnerabilities in database queries to gain unauthorised access or manipulate data. Poor network policy, human error, and a lack of security updates can also create significant vulnerabilities. Evaluating these threats involves understanding their mechanisms, potential impact, and identifying appropriate mitigation strategies to protect digital assets and maintain system functionality.