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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q280-Q285):

NEW QUESTION # 280
A Security Engineer at a medium-sized accounting firm has been tasked with discovering how much information can be obtained from the firm's public facing web servers. The engineer decides to start by using netcat to port 80.
The engineer receives this output:
HTTP/1.1 200 OK
Server: Microsoft-IIS/6
Expires: Tue, 17 Jan 2011 01:41:33 GMT
Date: Mon, 16 Jan 2011 01:41:33 GMT
Content-Type: text/html
Accept-Ranges: bytes
Last Modified: Wed, 28 Dec 2010 15:32:21 GMT
ETag:"b0aac0542e25c31:89d"
Content-Length: 7369
Which of the following is an example of what the engineer performed?

Answer: D


NEW QUESTION # 281
If a token and 4-digit personal identification number (PIN) are used to access a computer system and the token performs off-line checking for the correct PIN, what type of attack is possible?

Answer: C

Explanation:
If the token itself (e.g., hardware key or smartcard) performs offline verification of the PIN, it can be physically attacked. An attacker can:
Steal the token
Try all possible PIN combinations (0000-9999)
Bypass limits if no lockout mechanisms exist
This is a brute-force attack - the attacker tries every combination until the correct one is found.
From CEH v13 Courseware:
Module 6: Malware and Authentication
Module 20: Identity and Access Management
Incorrect Options:
A: Birthday attacks are related to hash collisions.
C: MITM involves intercepting communication, not offline brute-force.
D: Smurf is a DoS attack, not related to token/PIN systems.
Reference:CEH v13 Study Guide - Module 6: Authentication AttacksOWASP - Hardware Token Security Considerations
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NEW QUESTION # 282
You need to deploy a new web-based software package for your organization. The package requires three separate servers and needs to be available on the Internet. What is the recommended architecture in terms of server placement?

Answer: A


NEW QUESTION # 283
During a red team assessment at a banking client in Chicago, ethical hacker David gains access to the internal LAN. He sets up a test machine and injects crafted messages into the network. Soon, all traffic between a finance workstation and the authentication server is silently routed through his system without changing switch configurations. He observes usernames and passwords passing through his interface, even though no proxy or VPN is in use.
Which sniffing technique did David most likely use?

Answer: B

Explanation:
The correct answer is B. ARP Spoofing because the described outcome-silently redirecting traffic between two hosts through the attacker's machine on a LAN without changing switch configurations-is the classic effect of ARP poisoning (also called ARP spoofing). In CEH-aligned network sniffing and man-in-the-middle (MITM) techniques, ARP spoofing works by sending forged ARP replies onto the local network so that a victim host associates the attacker's MAC address with the IP address of a legitimate system (commonly the default gateway or another target host). Once the victim's ARP cache is poisoned, frames intended for the real destination are instead sent to the attacker, who can then forward them to the legitimate host to maintain connectivity while inspecting or altering the traffic.
The scenario states David "injects crafted messages" and then "all traffic between a finance workstation and the authentication server is silently routed through his system." That behavior strongly indicates ARP spoofing performed in both directions: poisoning the workstation to believe the attacker is the authentication server (or gateway) and poisoning the server to believe the attacker is the workstation (or gateway). This enables a transparent MITM position where credentials can be observed-especially if protocols are unencrypted or if the attacker can downgrade or strip protections. The fact that "no proxy or VPN is in use" supports the idea that the redirection is happening at Layer 2/Layer 3 on the local segment rather than via an explicit application-level proxy.
Why the other options are less accurate: Switch port stealing targets switch CAM tables to redirect frames, but it is less directly described than ARP cache poisoning between two IP endpoints. An STP attack manipulates spanning tree to become the root bridge and can influence paths, but it is a different control-plane attack and usually affects broader Layer 2 topology. IRDP spoofing involves ICMP Router Discovery Protocol to advertise a rogue router, but the scenario fits the much more common and direct MITM sniffing technique on a switched LAN: ARP spoofing.
Therefore, David most likely used ARP spoofing.


NEW QUESTION # 284
An attacker decided to crack the passwords used by industrial control systems. In this process, he employed a loop strategy to recover these passwords. He used one character at a time to check whether the first character entered is correct; if so, he continued the loop for consecutive characters. If not, he terminated the loop.
Furthermore, the attacker checked how much time the device took to finish one complete password authentication process, through which he deduced how many characters entered are correct.
What is the attack technique employed by the attacker to crack the passwords of the industrial control systems?

Answer: D

Explanation:
The described method is a classic example of a Side-Channel Attack, specifically a Timing Attack.
Key characteristics:
* It exploits variations in response time from a system to infer sensitive information, such as the correct number of characters in a password.
* In this scenario, if a correct character causes a longer processing time, the attacker can deduce the correct sequence iteratively.
According to CEH v13:
* Side-channel attacks do not directly break encryption but rely on observing system behavior like timing, power consumption, or electromagnetic leaks.
* These attacks are effective against poorly implemented authentication mechanisms or embedded systems like ICS/SCADA.
Incorrect Options:
* B. Denial-of-service is aimed at making systems unavailable, not extracting credentials.
* C. HMI-based attacks involve manipulating the human-machine interface of ICS systems.
* D. Buffer overflow exploits memory handling flaws, not timing behavior.
Reference - CEH v13 Official Courseware:
Module 20: Cryptography
Section: "Cryptanalysis and Side-Channel Attacks"
Subsection: "Timing Attacks and Password Recovery"


NEW QUESTION # 285
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