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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q581-Q586):

NEW QUESTION # 581
What hacking attack is challenge/response authentication used to prevent?

A. Scanning attacks
B. Replay attacks
C. Session hijacking attacks
D. Password cracking attacks

Answer: B

Explanation:
Challenge/response authentication is designed to prevent replay attacks. In this mechanism:
The server sends a random "challenge" string.
The client uses its secret (like a password or private key) to generate a response.
The server verifies that the response matches what it expected for that challenge.
Since the challenge is random and changes each time, an attacker cannot simply capture and replay previous responses to gain unauthorized access.
From CEH v13 Courseware:
Module 11: Session Hijacking
Module 6: Authentication Protocols
CEH v13 Study Guide states:
"Challenge-response authentication prevents replay attacks by using dynamically generated nonces or challenge tokens that change with each session." Incorrect Options:
B: Scanning attacks are not related to authentication mechanisms.
C: Session hijacking involves active takeovers, not replaying login attempts.
D: Password cracking targets password hashes, not session tokens.
Reference:CEH v13 Study Guide - Module 11: Authentication Mechanisms and Replay Attack MitigationRFC 2831 - Digest Access Authentication
======

NEW QUESTION # 582
Elante company has recently hired James as a penetration tester. He was tasked with performing enumeration on an organization's network. In the process of enumeration, James discovered a service that is accessible to external sources. This service runs directly on port 21.
What is the service enumerated by James in the above scenario?

A. Border Gateway Protocol (BGP)
B. Remote Procedure Call (RPC)
C. File Transfer Protocol (FTP)
D. Network File System (NFS)

Answer: C

Explanation:
In CEH v13 Module 04: Enumeration, identifying services based on well-known port numbers is foundational for enumeration and scanning activities.
Port 21/TCP is assigned to the File Transfer Protocol (FTP).
FTP is a standard protocol used to upload, download, and manage files on a remote server.
During enumeration, open FTP ports can be probed for:
Anonymous login
Banner grabbing
Directory traversal vulnerabilities
Option Clarification:
A: BGP: Runs on TCP port 179.
C: NFS: Commonly uses port 2049.
D: RPC: Dynamically uses multiple ports.
Correct answer is B. FTP (port 21).
Reference:
Module 04 - Enumeration Ports and Services
CEH eBook Appendix: Common Port Numbers and Protocols

NEW QUESTION # 583
As a network administrator, you explain to your team that a recent DDoS attack targeted the application layer of your company's web server. Which type of DDoS attack was most likely used?

A. SYN flood attack
B. HTTP flood attack
C. ICMP flood attack
D. UDP flood attack

Answer: B

Explanation:
According to the CEH Denial-of-Service (DoS/DDoS) module, application-layer DDoS attacks specifically target services such as HTTP, HTTPS, DNS, or APIs by sending requests that appear legitimate but overwhelm server resources.
An HTTP flood attack sends a massive number of HTTP GET or POST requests, consuming CPU, memory, and application threads. CEH highlights that these attacks are particularly dangerous because they:
* Mimic normal user behavior
* Are difficult to distinguish from legitimate traffic
* Bypass traditional network-layer defenses
Option A is correct.
Options B, C, and D operate primarily at the network or transport layers, not the application layer.
CEH stresses that HTTP floods are among the most challenging DDoS attacks to mitigate due to their stealthy nature.

NEW QUESTION # 584
A penetration tester targets a WPA2-PSK wireless network. The tester captures the handshake and wants to speed up cracking the pre-shared key. Which approach is most effective?

A. Conduct a Cross-Site Scripting (XSS) attack on the router's login page
B. Perform a SQL injection attack to bypass the WPA2 authentication
C. Use a brute-force attack to crack the pre-shared key manually
D. Use a dictionary attack with a large wordlist to crack the WPA2 key

Answer: D

Explanation:
CEH v13 explains that WPA2-PSK security relies on the strength of the pre-shared key. Once the 4-way handshake is captured, the attacker must attempt offline cracking. CEH emphasizes that the dictionary attack is the most efficient and commonly used cracking method because it tests structured wordlists, human-derived passwords, and hybrid permutations, dramatically reducing time compared to full brute force. Brute forcing (Option B) is computationally heavy and often impractical unless the password is extremely short. XSS (Option A) and SQL injection (Option D) have no relevance to WPA2 authentication, which occurs at the wireless protocol level, not the router's web interface. The dictionary attack is highlighted in CEH as the principal technique used with tools like aircrack-ng, hashcat, and pyrit, allowing rapid key testing using optimized GPU or CPU cracking. Thus, Option C is the most effective and CEH-aligned method.

NEW QUESTION # 585
During a post-exploitation phase in a network compromise simulation, ethical hacker Devon Hughes gains a Meterpreter session on a manager's Windows 10 workstation. To maintain stealth, he avoids actions that generate obvious signs of tampering such as privilege escalation or file system changes. Instead, he wants to monitor the user's live activity over time without their knowledge, focusing specifically on input patterns and active sessions.
Which Meterpreter command should he use to achieve this objective with minimal visibility?

A. keyscan_start
B. persistence
C. AThis scenario is testing recognition of a post-exploitation objective focused on covertly observing user activity, specifically "input patterns," which directly aligns with keystroke capture or keylogging behavior. In CEH coverage of System Hacking and Post-Exploitation, attackers who already have interactive access commonly shift to information-gathering actions that reveal credentials and sensitive business data without performing noisy changes such as privilege escalation or writing artifacts to disk.
Keystroke monitoring is a classic example because it can capture usernames, passwords, internal system commands, chat messages, and other sensitive inputs as the user works, often with lower visibility than actions that alter system configuration.The remaining options map to different post- exploitation goals and are less consistent with the prompt's emphasis on stealth and "no obvious signs of tampering." Dumping password hashes (hashdump) targets stored credential material and is typically associated with higher privilege requirements and higher detection potential due to access to sensitive security databases. Persistence is about maintaining long-term access across reboots and usually introduces artifacts such as registry changes, scheduled tasks, or services-precisely the type of detectable modification the prompt says Devon wants to avoid. Privilege escalation (getsystem) explicitly attempts to elevate rights, increasing operational risk and logging footprint.From a defensive perspective, CEH emphasizes mitigating this class of activity with strong endpoint monitoring and EDR, least-privilege controls, rapid patching, application allowlisting, and credential protections such as MFA and hardened authentication storage. Teams should alert on suspicious input-capture behaviors, abnormal process activity, and unusual remote sessions to detect post-exploitation collection attempts early.
D. hashdump
E. getsystem

Answer: A,B,C,D,E

NEW QUESTION # 586
......

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Free PDF 2026 Trustable ECCouncil 312-50v13 Exam Introduction

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312-50v13 Accurate Test - 312-50v13 Latest Exam Tips

ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q581-Q586):

Free PDF Quiz ECCouncil - Efficient 312-50v13 Exam Introduction

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