Interview Preparation For Cyber Security Freshers PDF

Interview Preparation 1. Can you explain what cybersecurity is and why it is important in today’s digital world? Cybersecurity is all about protecting computers, networks, and data from cyber threats like hackers, viruses, and unauthorized access. It helps keep our information safe and ensures tha...

Interview Preparation 1. Can you explain what cybersecurity is and why it is important in today’s digital world? Cybersecurity is all about protecting computers, networks, and data from cyber threats like hackers, viruses, and unauthorized access. It helps keep our information safe and ensures that systems work without problems. In today’s digital world, with more people using the internet and online services, the risk of cyberattacks is higher. Cybersecurity is important because it prevents data theft, financial loss, and damage to a company’s reputation. Example: A company might use firewalls and antivirus software to block harmful attacks and keep sensitive data safe, ensuring that only authorized people can access it. New Follow-Up Questions: What are some common types of cyberattacks and how can they be prevented? How does encryption play a role in cybersecurity? What are the main challenges organizations face when securing their networks? 2. What is the difference between a threat, vulnerability, and risk? Threat: A potential source of harm, such as malware or a hacker. Vulnerability: A weakness or flaw in a system that can be exploited by a threat. Risk: The likelihood of a threat exploiting a vulnerability, causing damage. Example: A company using outdated software (vulnerability) could be attacked by ransomware (threat), increasing the risk of data loss. Expected Follow-Up Questions: How do you identify vulnerabilities in a system? What tools are commonly used to mitigate risks? Can you describe a recent high-profile attack involving these concepts? 3. What is the CIA triad? The CIA triad is the foundation of information security: Confidentiality: Ensures sensitive information is accessible only to authorized users. Integrity: Ensures data remains accurate and unaltered. Availability: Ensures systems and data are available when needed. Example: A secure online banking system encrypts user data (confidentiality), prevents unauthorized changes (integrity), and stays operational 24/7 (availability). Expected Follow-Up Questions: Can you provide examples of threats to each component of the CIA triad? How do organizations balance confidentiality and availability? What tools and technologies help ensure data integrity? 4. What is the principle of least privilege? The principle of least privilege states that users should have the minimum level of access necessary to perform their tasks. This limits potential damage from accidental or intentional misuse of privileges. Example: A junior employee in HR can view employee records but cannot modify salary details. Expected Follow-Up Questions: How do you enforce the principle of least privilege in a large organization? What risks arise from failing to implement this principle? How does the principle of least privilege apply to system administrators? 5. What is two-factor authentication (2FA)? 2FA is a security method that requires two types of verification to access a system—typically something you know (password) and something you have (OTP or security token). Example: Logging into a cloud storage account using a password and a code sent to your phone. Expected Follow-Up Questions: What are the most common types of second factors used in 2FA? What are the limitations of 2FA? How does 2FA differ from multi-factor authentication (MFA)? 6. What is a firewall? A firewall is a network security device or software that monitors and controls incoming and outgoing traffic based on predefined security rules. It acts as a barrier between a trusted internal network and untrusted external networks. Example: A company configures a firewall to block traffic from specific IP addresses to prevent unauthorized access. Expected Follow-Up Questions: What are the differences between hardware and software firewalls? How do stateful firewalls differ from stateless firewalls? Can you explain how firewalls integrate with other network security tools? 7. What is an IDS and how is it different from an IPS? IDS (Intrusion Detection System): Monitors network traffic for malicious activity and alerts administrators but doesn’t block the traffic. IPS (Intrusion Prevention System): Detects and actively blocks malicious traffic in real- time. Example: An IDS detects unusual login attempts and alerts the admin, while an IPS automatically blocks the attempts. Expected Follow-Up Questions: What are the limitations of IDS compared to IPS? How do anomaly-based IDS systems work? What challenges do organizations face in deploying an IPS effectively? 8. What is phishing? Phishing is a social engineering attack where attackers trick users into revealing sensitive information, like passwords or credit card details, by pretending to be a trusted entity. Example: An attacker sends an email impersonating a bank, asking users to click a link and update their account details on a fake website. Expected Follow-Up Questions: How can individuals and organizations protect against phishing attacks? What is spear phishing, and how does it differ from regular phishing? Can you describe a high-profile phishing attack and its impact? 9. What is a VPN and why is it used? A VPN (Virtual Private Network) creates a secure and encrypted connection over the internet, allowing users to access a private network remotely and anonymously. It protects data from interception. Example: A remote worker uses a VPN to securely access their company’s internal systems from home. Expected Follow-Up Questions: What are the main encryption protocols used in VPNs? What are the differences between site-to-site and remote-access VPNs? How can using a VPN improve privacy but still have limitations? 10. What is a brute force attack? A brute force attack is a trial-and-error method used to guess login credentials, encryption keys, or passwords by systematically trying all possible combinations. Example: An attacker uses an automated tool to guess a user’s email password by trying thousands of common password combinations. Expected Follow-Up Questions: How can organizations protect systems from brute force attacks? What tools do attackers commonly use for brute force attacks? How does rate limiting or account lockout mitigate brute force attacks? 11. What is a man-in-the-middle (MITM) attack? A MITM attack occurs when an attacker secretly intercepts and relays communication between two parties, making them believe they are communicating directly. This allows the attacker to steal or manipulate data. Example: An attacker intercepts traffic between a user and a banking website on an unsecured Wi-Fi network, stealing login credentials. Expected Follow-Up Questions: How can encryption (like HTTPS) help prevent MITM attacks? What are the common tools used by attackers to perform MITM attacks? Can you describe a real-world example of a MITM attack and its impact? 12. What is SQL injection? SQL injection is a code injection attack that exploits vulnerabilities in a database query by inserting malicious SQL statements, allowing attackers to access, modify, or delete data. Example: An attacker enters ' OR '1'='1 in a login form, bypassing authentication and gaining unauthorized access to the database. Expected Follow-Up Questions: What are the best practices to prevent SQL injection attacks? How do prepared statements and parameterized queries mitigate SQL injection? Can you explain how an attacker escalates an SQL injection attack beyond data theft? 13. What is cross-site scripting (XSS)? XSS is a vulnerability where attackers inject malicious scripts into trusted websites, which are then executed in users' browsers, often stealing cookies or sensitive information. Example: An attacker injects a tag into a comment section, stealing session cookies of other users who view the page. Expected Follow-Up Questions: How can input validation prevent XSS attacks? What are the differences between reflected, stored, and DOM-based XSS? How do Content Security Policies (CSPs) mitigate XSS risks? 14. What is ransomware? Ransomware is a type of malware that encrypts a victim's data and demands a ransom payment for decryption. It often spreads through phishing emails or malicious downloads. Example: The WannaCry ransomware attack in 2017 encrypted files on Windows systems worldwide, demanding Bitcoin payments to restore access. Expected Follow-Up Questions: What proactive measures can organizations take to protect against ransomware? How should a company respond if they fall victim to a ransomware attack? What role do backups play in recovering from ransomware attacks? 15. What is the difference between hashing and encryption? Hashing: Converts data into a fixed-length value (hash) that cannot be reversed. Used for verifying data integrity. Encryption: Transforms data into ciphertext, which can be decrypted back to plaintext using a key. Used for securing data transmission or storage. Example: Passwords are hashed before storage in a database, while credit card details are encrypted for secure transactions. Expected Follow-Up Questions:  Can you explain common hashing algorithms like SHA-256 and their use cases? How does salting improve the security of hashed passwords? What are the differences between symmetric and asymmetric encryption? 16. What is social engineering? Social engineering is a psychological manipulation technique used by attackers to trick individuals into divulging confidential information or performing certain actions, such as clicking malicious links or granting access. Example: An attacker impersonates an IT technician and convinces an employee to share their login credentials over a phone call. Expected Follow-Up Questions: What are common types of social engineering attacks? How can organizations train employees to detect and prevent social engineering? Can you describe a real-life incident where social engineering was used successfully? 17. What is network sniffing? Network sniffing is the process of monitoring and capturing data packets as they travel across a network. While it is used for legitimate network troubleshooting, attackers use it to steal sensitive data. Example: An attacker uses Wireshark to capture unencrypted login credentials sent over an insecure network. Expected Follow-Up Questions: What are the differences between active and passive sniffing? How can organizations protect against malicious sniffing attacks? What tools are commonly used for ethical sniffing in cybersecurity? 18. What is a denial-of-service (DoS) attack? A DoS attack floods a system, server, or network with excessive traffic or requests, overwhelming its resources and rendering it unavailable to legitimate users. Example: An attacker uses a botnet to send millions of requests to a website, causing it to crash and become inaccessible. Expected Follow-Up Questions: How do distributed denial-of-service (DDoS) attacks differ from DoS attacks?  What mitigation techniques are effective against DoS attacks? Can you explain how traffic filtering helps in preventing DoS attacks? 19. What is multi-factor authentication (MFA)? MFA is a security measure that requires users to provide two or more verification factors to access a system, ensuring stronger protection than single-factor authentication. Factors include: Something you know (password). Something you have (security token or OTP). Something you are (biometric data). Example: Accessing an online banking account requires a password and a fingerprint scan. Expected Follow-Up Questions: How does MFA enhance security in comparison to 2FA? What challenges do organizations face when implementing MFA? Can you explain how SMS-based MFA differs from app-based MFA? 20. What is penetration testing? Penetration testing (pen testing) is a simulated cyberattack conducted by ethical hackers to identify vulnerabilities in a system, network, or application. It helps organizations strengthen their security posture. Example: A penetration tester exploits a weak password policy to gain unauthorized admin access and recommends implementing stronger password requirements. Expected Follow-Up Questions: What are the different types of penetration testing? How do black-box, white-box, and gray-box pen tests differ? Can you describe the typical steps in a penetration testing process? 21. What is the MITRE ATT&CK framework? The MITRE ATT&CK framework is a knowledge base of adversary tactics, techniques, and procedures (TTPs) used in cybersecurity to understand and respond to threats. It helps organizations map attack behaviors and enhance their defenses. Example: A SOC team uses MITRE ATT&CK to identify that an attacker is using lateral movement techniques, such as Pass-the-Hash, to move within the network. Expected Follow-Up Questions: How does the MITRE ATT&CK framework differ from the Cyber Kill Chain? How can organizations integrate MITRE ATT&CK into their SIEM tools? Can you give an example of how the framework helps in incident response? 22. What is the difference between symmetric and asymmetric encryption? Symmetric encryption: Uses a single key for both encryption and decryption. Asymmetric encryption: Uses a pair of keys—a public key for encryption and a private key for decryption. Example: AES is a symmetric encryption algorithm, while RSA is an asymmetric encryption algorithm used for secure key exchange. Expected Follow-Up Questions: What are the advantages and disadvantages of symmetric encryption? How is asymmetric encryption used in SSL/TLS protocols? Can you explain how a hybrid encryption approach works? 23. What is the difference between black hat, white hat, and gray hat hackers? Black hat hackers: Malicious hackers who exploit vulnerabilities for personal gain. White hat hackers: Ethical hackers who identify and fix vulnerabilities. Gray hat hackers: Hackers who exploit vulnerabilities without malicious intent but without proper authorization. Example: A white hat hacker is hired to perform penetration testing, while a black hat hacker may exploit the same vulnerability to steal data. Expected Follow-Up Questions: What certifications are commonly pursued by white hat hackers? How do laws differentiate between ethical and unethical hacking? Can you provide examples of gray hat activities that have been controversial? 24. What is DNS spoofing? DNS spoofing is an attack where an attacker manipulates DNS records to redirect users to malicious websites instead of legitimate ones. Example: A user tries to visit a banking website but is redirected to a phishing site due to manipulated DNS records. Expected Follow-Up Questions: How does DNSSEC protect against DNS spoofing? What tools do attackers use for DNS spoofing? How can users identify if they are victims of DNS spoofing? 25. What is the difference between vulnerability assessment and penetration testing? Vulnerability assessment: Focuses on identifying and prioritizing vulnerabilities in systems. Penetration testing: Simulates real-world attacks to exploit vulnerabilities and assess their impact. Example: A vulnerability assessment detects outdated software, while a pen test confirms if it can be exploited to gain unauthorized access. Expected Follow-Up Questions: What tools are commonly used for vulnerability assessments? How do you decide when to perform a vulnerability assessment versus a penetration test? Can you explain how both processes complement each other in a security strategy? 26. What is the Cyber Kill Chain? The Cyber Kill Chain is a model developed by Lockheed Martin that outlines the stages of a cyberattack. It helps organizations understand and disrupt attacks at various phases. The stages include: Reconnaissance Weaponization Delivery Exploitation Installation Command and Control (C2) Actions on Objectives Example: An attacker gathers information about a target during the reconnaissance phase and later delivers a phishing email with a malicious payload. Expected Follow-Up Questions: How can organizations detect and prevent attacks during the reconnaissance phase? What are the limitations of the Cyber Kill Chain model? How does the Cyber Kill Chain compare to MITRE ATT&CK? 27. What is a zero-day vulnerability? A zero-day vulnerability is a software flaw unknown to the vendor or security community. It is called "zero-day" because attackers exploit it before a patch is available. Example: Attackers exploit a zero-day vulnerability in a popular browser to deploy spyware before a security update is released. Expected Follow-Up Questions: How can organizations protect themselves against zero-day vulnerabilities? What role do bug bounty programs play in identifying zero-day vulnerabilities? Can you provide an example of a recent high-profile zero-day exploit? 28. What is lateral movement in cybersecurity? Lateral movement refers to the techniques attackers use to move within a network after gaining initial access. It allows them to escalate privileges and access critical systems. Example: An attacker uses compromised credentials to move from a low-privileged account to an admin account on the same network. Expected Follow-Up Questions: What tools do attackers commonly used for lateral movement? How can organizations detect and prevent lateral movement in their networks? Can you explain the role of Active Directory in facilitating or mitigating lateral movement? 29. What is a honeypot? A honeypot is a decoy system designed to attract attackers and monitor their behavior. It mimics real systems but isolates malicious activities for analysis. Example: A company deploys a fake database server as a honeypot to detect attackers attempting SQL injection attacks. Expected Follow-Up Questions: How do honeypots contribute to threat intelligence? What are the risks of using honeypots in a production environment? How do high-interaction and low-interaction honeypots differ? 30. What is endpoint detection and response (EDR)? EDR is a security solution that monitors and analyzes endpoint activities to detect, investigate, and respond to threats. It provides real-time visibility and automated response capabilities. Example: An EDR solution detects unusual file encryption activity on an employee's laptop, indicating ransomware, and immediately isolates the endpoint from the network. Expected Follow-Up Questions: How does EDR differ from traditional antivirus software? What are the key features organizations should look for in an EDR solution? How does EDR integrate with other security tools like SIEM?