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질문 # 92
Can all computers be hacked?
정답:B
설명:
From a cybersecurity and ethical hacking perspective, the most accurate answer isoption C: yes, all computers are hackable. This does not mean that all systems are easily compromised, but rather thatno system is 100% secureunder all circumstances.
Security is a matter of risk management, not absolute prevention. Even fully patched systems with strong security controls may be vulnerable to zero-day exploits, misconfigurations, supply-chain attacks, physical access threats, or human factors such as social engineering. Ethical hackers assess these risks to determine how systems could be compromised under realistic threat scenarios.
Option A is incorrect because even updated systems with minimal exposure can still be attacked through advanced techniques. Option B is incorrect because hacking is not always easy or without complications; strong defenses significantly increase the difficulty.
Understanding this concept is critical in modern security strategy. Ethical hacking promotesdefense in depth, continuous monitoring, regular testing, and user awareness rather than reliance on a single control.
Acknowledging that all systems are potentially hackable encourages proactive security practices, timely patching, strong authentication, network segmentation, and incident response planning. Ethical hackers help organizations identify weaknesses early, reduce risk, and improve resilience against evolving cyber threats.
질문 # 93
What is SQL Injection?
정답:A
설명:
SQL Injection is acritical web application vulnerabilitythat allows attackers to manipulate SQL queries executed by a database, making option A the correct answer. This vulnerability occurs when user input is improperly validated or sanitized before being included in SQL statements.
By exploiting SQL Injection, attackers can bypass authentication, retrieve sensitive data, modify or delete database contents, and in some cases execute administrative operations on the database server. Ethical hackers test for SQL Injection during web application penetration testing to identify insecure coding practices.
Option B is incorrect because SQL Injection is not a database system. Option C is incorrect because SQL Injection allows unauthorized users to execute SQL commands, not just administrators.
From a defensive security perspective, SQL Injection highlights the importance of secure coding practices such as parameterized queries, prepared statements, input validation, and least-privilege database access.
SQL Injection remains a top threat due to legacy applications and poor development practices. Ethical hackers use controlled testing to demonstrate the real-world impact of these vulnerabilities and help organizations protect critical data assets.
질문 # 94
What is a black hat hacker?
정답:C
설명:
A "Black Hat" hacker is the primary threat actor in the cybersecurity landscape, representing the criminal element of the hacking community. These individuals use their advanced computer skills and technical knowledge with malicious intent to breach security defenses. Their goals typically involve stealing confidential information, infecting computer systems with malware, or restricting access to a system (as seen in DDoS or ransomware attacks) for personal gain, financial profit, or ideological reasons.
Black Hat hackers operate without authorization and often hide their tracks through anonymization tools like VPNs, Tor, and proxy chains. Their methodology involves finding and exploiting vulnerabilities-often
"Zero-Day" flaws that the vendor is not yet aware of-to gain a foothold in a target network. Once inside, they may engage in corporate espionage, sell stolen data on the dark web, or hold an organization's operations hostage.
For a security professional, managing the threat of Black Hat hackers is a continuous cycle of "Threat Hunting" and "Risk Mitigation." Ethical hackers must study the tactics, techniques, and procedures (TTPs) used by Black Hats to build more resilient defenses. While Black Hats are the "adversaries," they also drive the evolution of security technology; as they find new ways to break into systems, the industry must develop new encryption, authentication, and monitoring tools to stop them. Understanding the mindset of a Black Hat-how they prioritize targets and which vulnerabilities they find most attractive-is a key component of the CEH curriculum. It allows defenders to think like their opponents, ensuring that security controls are placed where they are most needed to protect an organization's most valuable confidential assets.
질문 # 95
What is an XSS?
정답:A
설명:
Cross-Site Scripting (XSS) is a critical security vulnerability prevalent in web applications. It occurs when an application includes untrusted data in a web page without proper validation or escaping, allowing an attacker to inject and execute malicious scripts-typically JavaScript-in the victim's web browser. Because the browser trusts the script as if it originated from the legitimate website, the script can access sensitive information stored in the browser, such as session cookies, tokens, or personal data.
There are three primary types of XSS:
* Stored (Persistent) XSS: The malicious script is permanently stored on the target server (e.g., in a database, in a comment field). When a victim views the page, the script executes.
* Reflected XSS: The script is "reflected" off a web application to the victim's browser, usually through a link containing the payload (e.g., in a URL parameter).
* DOM-based XSS: The vulnerability exists in the client-side code rather than the server-side code, where the script is executed by modifying the Document Object Model (DOM) environment.
Managing the threat of XSS involves implementing strict input validation and output encoding. Developers must ensure that any data provided by users is treated as "untrusted" and filtered to remove executable code before it is rendered on a page. From an ethical hacking perspective, identifying XSS is a key part of web application penetration testing. A successful XSS attack can lead to account hijacking, website defacement, or the redirection of users to malicious websites. By understanding how malicious scripts are executed in the context of other users' browsers, security professionals can better protect the integrity of web services and the privacy of their users.
질문 # 96
What is an "exploit" in the hacking world?
정답:B
설명:
In the hacking world, an "exploit" is a specialized piece of software, a chunk of data, or a sequence of commands that takes advantage of a bug or vulnerability in a system to cause unintended or unanticipated behavior. The primary goal of an exploit is to gain unauthorized access to a computer system, escalate privileges, or trigger a denial-of-service condition. Exploits are the "keys" used by hackers to unlock the doors found during the scanning and vulnerability analysis phases.
Exploits are typically categorized into two types based on where they are launched:Remote Exploits, which work over a network without prior access to the target, andLocal Exploits, which require prior access to the system to increase privileges. Within the ethical hacking lifecycle, the "Exploitation" phase occurs after a vulnerability has been identified and verified. An ethical hacker uses a specific exploit code to demonstrate the real-world impact of a flaw, proving to the stakeholders that the vulnerability is not just a theoretical risk but a practical entry point for an attacker.
It is important to differentiate an exploit from malware (Option A); while an exploit is themethodused to get in, malware is thepayloaddelivered once the door is open. Understanding exploits is fundamental for security professionals, as it allows them to develop "signatures" for intrusion detection systems and provides the justification needed for urgent patch management. By mastering the use of exploits in a controlled environment, such as with the Metasploit Framework, ethical hackers can better defend systems by anticipating how a malicious actor would attempt to break through technical barriers.
질문 # 97
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