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질문 # 50
What is Whois?
정답：A
설명：
WHOIS is a query and response protocol widely used for searching databases that store the registered users or assignees of an Internet resource, such as a domain name or an IP address block. It acts as a public directory that provides essential information about the ownership and technical management of a specific online asset.
When an individual or organization registers a domain name, they are required by ICANN (Internet Corporation for Assigned Names and Numbers) to provide contact information, which is then made available through WHOIS lookups.
A standard WHOIS record typically contains:
* Registrant Information: The name and organization of the person who owns the domain.
* Administrative and Technical Contacts: Names and email addresses of the people responsible for the site's operation.
* Registrar Information: The company where the domain was purchased and the date of registration
/expiration.
* Name Servers: The servers that direct traffic for the domain.
In ethical hacking, WHOIS is a primary tool forpassive reconnaissance. It allows a tester to map out the organizational structure of a target without ever sending a packet to the target's network. For example, finding the technical contact's email address might provide a lead for a social engineering attack, or identifying the name servers might reveal the cloud provider being used. While many owners now use "WHOIS Privacy" services to hide their personal details behind a proxy, WHOIS remains a critical first step in defining the
"footprint" of a target and understanding its administrative boundaries.
질문 # 51
What is a Firewall?
정답：A
설명：
A firewall is a fundamental network security component that acts as a barrier between a trusted internal network and an untrusted external network, such as the internet. Its primary function is to monitor, control, and filter incoming and outgoing network traffic based on a set of predefined security rules. By inspecting each packet of data, the firewall determines whether to allow it to pass through or to block it entirely, thereby preventing unauthorized access and malicious activity.
Firewalls can be implemented as either hardware or software, and they generally operate at different levels of the network stack:
* Packet Filtering: The most basic form, which inspects packets based on source/destination IP addresses and ports.
* Stateful Inspection: A more advanced method that tracks the state of active connections to ensure that incoming traffic is a legitimate response to an internal request.
* Application Level (Proxy Firewalls): These inspect the actual content of the data (the payload) for specific applications, such as web traffic (HTTP) or email (SMTP), to identify sophisticated threats that simple packet filters might miss.
In the context of ethical hacking, firewalls are the "first line of defense". During a penetration test, a tester must identify the type of firewall in place and attempt to find "holes" or misconfigurations in its rule set. For example, a common goal is to find a port that the firewall accidentally left open, which can then be used to establish areverse shell. A properly configured firewall is essential for minimizing an organization's attack surface and protecting its servers and individuals from being compromised.
질문 # 52
What is a reverse shell?
정답：A
설명：
A reverse shell is a technique used in ethical hacking and penetration testing where the target (victim) system initiates a connection back to the attacker's system, allowing the attacker to execute commands remotely. This makes option C the correct answer.
Unlike a bind shell, where the victim opens a listening port, a reverse shell is particularly effective in environments protected by firewalls or Network Address Translation (NAT). Since outbound connections are often allowed, the victim system connects outward to the attacker, bypassing many network restrictions.
Ethical hackers commonly use reverse shells during the exploitation and post-exploitation phases of penetration testing to maintain access to compromised systems.
Option A is incorrect because running a terminal as root does not define a reverse shell. Option B is incorrect because a reverse shell is not a standard command-line interface but rather a remote command execution channel.
From an ethical hacking perspective, reverse shells help demonstrate the real-world impact of vulnerabilities such as command injection, remote code execution, or misconfigured services. Once established, a reverse shell may allow privilege escalation, lateral movement, or data exfiltration-highlighting serious security risks.
Understanding reverse shells is essential for both attackers and defenders. Defenders can mitigate reverse shell attacks by implementing strict egress filtering, intrusion detection systems, endpoint protection, and proper system hardening. Ethical testing of reverse shells enables organizations to identify weaknesses and improve overall security posture.
질문 # 53
What is the main purpose of a "SQL injection" attack?
정답：C
설명：
SQL Injection (SQLi) is one of the most prevalent and damaging information security threats targeting web applications. Its main purpose is to exploit a database by manipulating Structured Query Language (SQL) commands through user-supplied input. This occurs when an application fails to properly filter or "sanitize" data entered into forms, URL parameters, or cookies, allowing an attacker to "inject" their own SQL code into the query that the application sends to the back-end database.
When successful, a SQL injection attack can have catastrophic consequences for an organization's data integrity and confidentiality. An attacker can bypass authentication to log in as an administrator without a password, view sensitive user data, modify or delete database records, and in some cases, gain administrative control over the entire database server. A classic example is the ' OR 1=1 -- injection, which forces a query to return "true" regardless of the credentials provided, effectively opening the door to the system.
Managing the threat of SQLi is a top priority for web security. The most effective defense is the use of
"Parameterized Queries" (also known as prepared statements), which ensure that the database treats user input as data rather than executable code. Additionally, implementing "Input Validation" and the "Principle of Least Privilege" for database accounts helps mitigate the potential damage. From an ethical hacking standpoint, identifying SQLi vulnerabilities is a core component of vulnerability scanning and manual testing. Because databases often hold an organization's most valuable assets-including customer identities and financial records-protecting them from injection attacks is a non-negotiable aspect of modern information security management.
질문 # 54
Security Vulnerabilities: Understanding Backdoors
정답：B
설명：
The term "Whitehack," more commonly known as a "White Hat Hacker," describes individuals who utilize their technical expertise for ethical and legal purposes. These professionals are the cornerstone of the ethical hacking community. They operate under a strict code of ethics and, most importantly, always obtain explicit, written permission before conducting any security assessments or penetration tests. Their primary objective is to strengthen an organization's security posture by proactively discovering vulnerabilities before malicious actors (Black Hats) can exploit them.
White Hat hackers perform various tasks, including penetration testing, vulnerability assessments, security auditing, and developing security protocols. When they identify a flaw, they do not exploit it for personal gain or damage; instead, they document the finding in a comprehensive report and provide actionable remediation advice to the organization's IT and security teams. This collaborative approach helps organizations understand their weaknesses and allocate resources effectively to mitigate risks. Many White Hat hackers are certified professionals, holding credentials such as Certified Ethical Hacker (CEH) or Offensive Security Certified Professional (OSCP). They often work as security consultants, in-house security analysts, or as part of specialized "Red Teams" that simulate real-world attacks to test defensive capabilities. By mimicking the tactics, techniques, and procedures (TTPs) of real adversaries within a controlled and authorized framework, White Hats provide invaluable insights that automated tools alone cannot achieve. Their work is essential in the modern digital landscape, where the constant evolution of threats requires a defensive strategy that is equally dynamic and informed by a deep understanding of the "hacker mindset." Ultimately, the distinction between a White Hat and other types of hackers is defined by intent, authorization, and the commitment to improving the safety of the digital ecosystem.
질문 # 55
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