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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q402-Q407):

NEW QUESTION # 402
Peter, a Network Administrator, has come to you looking for advice on a tool that would help him perform SNMP enquires over the network.
Which of these tools would do the SNMP enumeration he is looking for? Select the best answers.

A. NMap
B. SNMPUtil
C. SNMPScan
D. Solarwinds IP Network Browser
E. SNScan

Answer: B,D,E

NEW QUESTION # 403
How does a denial-of-service (DoS) attack work?

A. A hacker uses every character, word, or letter he or she can think of to defeat authentication
B. A hacker tries to decipher a password by using a system, which subsequently crashes the network
C. A hacker prevents a legitimate user (or group of users) from accessing a service
D. A hacker attempts to imitate a legitimate user by confusing a computer or even another person

Answer: C

Explanation:
Comprehensive and Detailed Explanation:
A Denial-of-Service (DoS) attack aims to overwhelm a system or service with excessive requests, rendering it unavailable to legitimate users. It targets:
* Bandwidth (e.g., flooding with traffic)
* Resources (CPU, memory, or disk usage)
* Applications (exploiting bugs that crash services)
From CEH v13 Courseware:
* Module 9: Denial-of-Service Attacks
Incorrect Options:
* B refers to brute-force attacks.
* C mischaracterizes password cracking.
* D describes impersonation or spoofing, not DoS.
Reference:CEH v13 Study Guide - Module 9: Types of DoS AttacksNIST SP 800-61r2 - Incident Handling Guide

NEW QUESTION # 404
Which of the following are well-known password-cracking programs?

A. Netbus
B. Jack the Ripper
C. John the Ripper
D. L0phtcrack
E. NetCat

Answer: C,D

Explanation:
Well-known and widely used password-cracking tools include:
* A. L0phtcrack - Windows password auditing tool that can crack LM and NTLM hashes.
* E. John the Ripper - Versatile password cracker that supports many hash types on Unix, Windows, etc.
Incorrect Options:
* B. NetCat - A network tool used for port scanning and data transfer.
* C. "Jack the Ripper" is likely a mistaken reference to John the Ripper.
* D. Netbus - A remote access Trojan, not a password cracker.
From CEH v13 Courseware:
* Module 6: Password Cracking Tools
Reference:CEH v13 Study Guide - Module 6: Common Password Cracking Tools

NEW QUESTION # 405
John, a professional hacker, decided to use DNS to perform data exfiltration on a target network, in this process, he embedded malicious data into the DNS protocol packets that even DNSSEC cannot detect. Using this technique. John successfully injected malware to bypass a firewall and maintained communication with the victim machine and C&C server. What is the technique employed by John to bypass the firewall?

A. DNS cache snooping
B. DNS enumeration
C. DNSSEC zone walking
D. DNS tunneling method

Answer: D

Explanation:
DNS tunneling may be a method wont to send data over the DNS protocol, a protocol which has never been intended for data transfer. due to that, people tend to overlook it and it's become a well-liked but effective tool in many attacks.Most popular use case for DNS tunneling is obtaining free internet through bypassing captive portals at airports, hotels, or if you are feeling patient the not-so-cheap on the wing Wi-Fi.On those shared internet hotspots HTTP traffic is blocked until a username/password is provided, however DNS traffic is usually still allowed within the background: we will encode our HTTP traffic over DNS and voila, we've internet access.This sounds fun but reality is, browsing anything on DNS tunneling is slow. Like, back to
1998 slow.Another more dangerous use of DNS tunneling would be bypassing network security devices (Firewalls, DLP appliances...) to line up an immediate and unmonitored communications channel on an organisation's network. Possibilities here are endless: Data exfiltration, fixing another penetration testing tool... you name it.To make it even more worrying, there's an outsized amount of easy to use DNS tunneling tools out there.There's even a minimum of one VPN over DNS protocol provider (warning: the planning of the web site is hideous, making me doubt on the legitimacy of it).As a pentester all this is often great, as a network admin not such a lot .
How does it work:For those that ignoramus about DNS protocol but still made it here, i feel you deserve a really brief explanation on what DNS does: DNS is sort of a phonebook for the web , it translates URLs (human-friendly language, the person's name), into an IP address (machine-friendly language, the phone number). That helps us remember many websites, same as we will remember many people's names.For those that know what DNS is i might suggest looking here for a fast refresh on DNS protocol, but briefly what you would like to understand is:* A Record: Maps a website name to an IP address.example.com ? 12.34.52.67* NS Record (a.k.a. Nameserver record): Maps a website name to an inventory of DNS servers, just in case our website is hosted in multiple servers.example.com ? server1.example.com, server2.example.comWho is involved in DNS tunneling?* Client. Will launch DNS requests with data in them to a website .* One Domain that we will configure. So DNS servers will redirect its requests to an outlined server of our own.* Server. this is often the defined nameserver which can ultimately receive the DNS requests.The 6 Steps in DNS tunneling (simplified):1. The client encodes data during a DNS request. The way it does this is often by prepending a bit of knowledge within the domain of the request. for instance : mypieceofdata.server1.example.com2. The DNS request goes bent a DNS server.3. The DNS server finds out the A register of your domain with the IP address of your server.4. The request for mypieceofdata.server1.example.com is forwarded to the server.5. The server processes regardless of the mypieceofdata was alleged to do. Let's assume it had been an HTTP request.6.
The server replies back over DNS and woop woop, we've got signal.
Bypassing Firewalls through the DNS Tunneling Method DNS operates using UDP, and it has a 255-byte limit on outbound queries. Moreover, it allows only alphanumeric characters and hyphens. Such small size constraints on external queries allow DNS to be used as an ideal choice to perform data exfiltration by various malicious entities. Since corrupt or malicious data can be secretly embedded into the DNS protocol packets, even DNSSEC cannot detect the abnormality in DNS tunneling. It is effectively used by malware to bypass the firewall to maintain communication between the victim machine and the C&C server. Tools such as NSTX (https://sourceforge.net), Heyoka (http://heyoka.sourceforge.netuse), and Iodine (https://code.kryo.se) use this technique of tunneling traffic across DNS port 53. CEH v11 Module 12 Page
994

NEW QUESTION # 406
Bob is going to perform an active session hijack against Brownies Inc. He has found a target that allows session-oriented connections (Telnet) and performs the sequence prediction on the target operating system. He manages to find an active session due to the high level of traffic on the network.
What is Bob supposed to do next?

A. Take over the session
B. Take one of the parties offline
C. Reverse sequence prediction
D. Guess the sequence numbers

Answer: B

Explanation:
In active session hijacking, after identifying a valid session, the attacker must desynchronize the legitimate communication between the client and the server. To do this, Bob should:
* Knock one of the parties offline (typically the client).
* Then spoof the session by injecting crafted packets using the guessed sequence number.
From CEH v13 Courseware:
* Module 11: Session Hijacking
CEH v13 Study Guide states:
"After identifying a session and predicting its sequence number, the attacker forces the original user offline, allowing them to assume control over the connection using spoofed packets." Incorrect Options:
* A: Taking over the session is the ultimate goal, but the necessary step before that is disconnecting the original participant.
* B: Sequence prediction is already done.
* C: Sequence number has already been guessed.
Reference:CEH v13 Study Guide - Module 11: TCP Session Hijacking ProcessRFC 793 - TCP State Management and Sequence Numbers

NEW QUESTION # 407
......

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