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国際証明書を取得することが既に決まっている場合は、すぐにCEHPC試験対策を購入する必要があります。当社の製品は、業界で最高品質の製品として認定されています。知り合いの紹介を通じてCEHPCトレーニング資料を知っている場合は、CEHPCの利点も知っておく必要があります。私たちのコンテンツとデザインは私たちに良い評判を築いてきました。私たちのユーザーは私たちのために喜んでボランティアします。これは素晴らしい製品だと想像できます！次に、CEHPC実際の試験の最も代表的な利点を紹介します。これらの利点が必要なものであるかどうかを考えることができます！
質問 # 70
Which of the following is a network security protocol designed to authenticate and authorize remote users to securely access network resources?
正解：B
解説：
Secure Shell (SSH) is a robust cryptographic network protocol utilized for operating network services securely over an unsecured network. Its primary application is the secure remote login to computer systems by administrators and users. Unlike earlier protocols such as Telnet or rlogin, which transmitted data (including passwords) in plain text, SSH provides a secure, encrypted channel. It achieves this through a suite of cryptographic techniques that ensure theconfidentiality,integrity, andauthenticityof the data being transmitted between the client and the server.
The protocol operates using a client-server architecture, where an SSH client initiates a connection to an SSH server. SSH facilitates both authentication and authorization. Authentication is typically performed using either a password or, more securely, a public-private key pair. Once the user's identity is verified, the protocol authorizes the level of access based on the server's configuration. Beyond simple terminal access, SSH supports secure file transfers (SFTP) and port forwarding, allowing other network protocols to be "tunneled" through its encrypted connection. From a security standpoint, while SSH is highly secure, it can be breached if misconfigured-such as by allowing weak passwords or failing to disable root login. Consequently, ethical hackers prioritize hardening SSH services as a fundamental control in protecting organizational assets.
質問 # 71
What is a backdoor in terms of computer security?
正解：C
解説：
In computer security, a backdoor refers to ahidden method of accessing a system that bypasses normal authentication and security mechanisms, making option A the correct answer. Backdoors can be intentionally created by developers for maintenance purposes or maliciously installed by attackers after compromising a system.
From an ethical hacking perspective, backdoors are commonly discovered duringpost-exploitation activities.
Attackers use them to maintain persistent access, even if passwords are changed or vulnerabilities are patched.
Backdoors may take the form of hidden user accounts, modified services, malicious scripts, or hardcoded credentials.
Option B is incorrect because malware that spreads through instant messaging is typically classified as a worm or trojan, not specifically a backdoor. Option C is incorrect because a backdoor is not a legitimate or documented access point.
Understanding backdoors is essential for managing information security threats. Ethical hackers identify backdoors to demonstrate long-term risks and highlight weaknesses in system monitoring and access controls.
Defenders can mitigate backdoor threats by implementing integrity monitoring, endpoint detection and response (EDR), regular audits, and strict access management.
Backdoors pose significant risks because they undermine trust in system security. Identifying and removing them is critical for restoring system integrity and preventing repeated compromise.
質問 # 72
What is a firewall?
正解：C
解説：
A firewall is a cornerstone master information security control that serves as a protective barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary function is to monitor and control incoming and outgoing network traffic based on a predetermined set of security rules. By analyzing packet headers-specifically IP addresses, port numbers, and protocols-the firewall determines whether to "allow," "block," or "drop" a connection attempt.
Firewalls can be implemented as hardware appliances, software installed on a host, or a combination of both.
They generally fall into several categories:
* Packet Filtering Firewalls: These examine individual packets in isolation and are the most basic form of protection.
* Stateful Inspection Firewalls: These track the state of active connections, ensuring that incoming traffic is only allowed if it is a response to a legitimate outgoing request.
* Next-Generation Firewalls (NGFW): These go beyond simple port/IP filtering by performing "Deep Packet Inspection" (DPI) to identify specific applications and even filter out malware or malicious commands within the traffic.
In the pentesting process, the firewall is the first major obstacle a tester encounters. It defines the "perimeter" of the organization. An ethical hacker will use port scanning to identify which "holes" exist in the firewall's ruleset. For defenders, a properly configured firewall is essential for implementing "Default Deny" policies, where all traffic is blocked unless it is explicitly permitted. This significantly reduces the attack surface by ensuring that services like database ports are never exposed to the public internet. While a firewall is not a substitute for antivirus (Option A) or an exploit method (Option B), it is the most vital tool for regulating network access and preventing unauthorized intrusions.
質問 # 73
What is a security breach?
正解：C
解説：
A security breach is defined as a cybersecurity incident that involves the unauthorized access, disclosure, or manipulation of personal or corporate data. It represents a significant failure of an organization's security controls, leading to a compromise of confidentiality, integrity, or availability. In the context of managing information security threats, a breach is often the culmination of a successful attack chain, where a threat actor has successfully identified a vulnerability, exploited it, and bypassed the existing defense layers to reach sensitive information assets.
Breaches can manifest in various ways, ranging from the theft of customer records and financial data to the exposure of trade secrets or internal communications. They are not merely "Internet breakups" or total shutdowns of the web; rather, they are targeted incidents that affect specific entities. The impact of a security breach is multifaceted, often resulting in severe financial losses, legal liabilities under data protection regulations (such as GDPR), and long-term reputational damage.
From an ethical hacking perspective, understanding the anatomy of a breach is essential for building better detection and response mechanisms. Professionals categorize breaches based on their "attack vector," such as phishing, unpatched software, or insider threats. By simulating these breaches during a penetration test, ethical hackers can help organizations identify "indicators of compromise" (IoCs) and improve their incident response plans. Managing this threat requires a proactive stance that includes regular vulnerability assessments, robust encryption of sensitive data, and continuous monitoring of network traffic to detect unauthorized data exfiltration before it escalates into a full-scale corporate catastrophe.
質問 # 74
What is the best practice to protect against malware?
正解：C
解説：
One of the most effective best practices to protect against malware isinstalling and regularly updating antivirus software, making option C the correct answer. Antivirus and endpoint protection solutions are designed to detect, block, and remove malicious software such as viruses, worms, trojans, ransomware, and spyware.
Modern malware evolves rapidly, using obfuscation and zero-day techniques to bypass outdated defenses.
Keeping antivirus software up to date ensures that the latest malware signatures, heuristics, and behavioral detection mechanisms are in place. Ethical hackers emphasize this practice because many successful attacks exploit systems with outdated or disabled security software.
Option A is incorrect because sharing login credentials on suspicious websites significantly increases the risk of malware infection and credential theft. Option B is incorrect because clicking on suspicious links is a common infection vector used in phishing and malware distribution campaigns.
From an ethical hacking perspective, malware prevention is part ofdefense-in-depth. Antivirus software should be combined with patch management, least-privilege access, secure browsing habits, and user awareness training. Ethical hackers often demonstrate how quickly unprotected systems can be compromised to highlight the importance of these controls.
Strong malware protection reduces attack surfaces, prevents data loss, and supports incident response efforts.
Maintaining updated antivirus software is a foundational information security control in modern environments.
質問 # 75
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