FREE 312-50V13 BRAINDUMPS, 312-50V13 NEW STUDY GUIDE

Free 312-50v13 Braindumps, 312-50v13 New Study Guide

Free 312-50v13 Braindumps, 312-50v13 New Study Guide

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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q108-Q113):

NEW QUESTION # 108
You are tasked to configure the DHCP server to lease the last 100 usable IP addresses in subnet to. 1.4.0/23.
Which of the following IP addresses could be teased as a result of the new configuration?

  • A. 10.1.5.200
  • B. 10.1.4.254
  • C. 210.1.55.200
  • D. 10.1.4.156

Answer: A

Explanation:
https://en.wikipedia.org/wiki/Subnetwork
As we can see, we have an IP address of 10.1.4.0 with a subnet mask of /23. According to the question, we need to determine which IP address will be included in the range of the last 100 IP addresses.
The available addresses for hosts start with 10.1.4.1 and end with 10.1.5.254. Now you can clearly see that the last 100 addresses include the address 10.1.5.200.


NEW QUESTION # 109
Your company, Encryptor Corp, is developing a new application that will handle highly sensitive user information. As a cybersecurity specialist, you want to ensure this data is securely stored. The development team proposes a method where data is hashed and then encrypted before storage. However, you want an added layer of security to verify the integrity of the data upon retrieval. Which of the following cryptographic concepts should you propose to the team?

  • A. a digital signature mechanism.
  • B. Switch to elliptic curve cryptography.
  • C. Suggest using salt with hashing.
  • D. Implement a block cipher mode of operation.

Answer: A

Explanation:
A digital signature mechanism is a cryptographic concept that you should propose to the team to verify the integrity of the data upon retrieval. A digital signature mechanism works as follows:
* A digital signature is a mathematical scheme that allows the sender of a message to sign the message with their private key, and allows the receiver of the message to verify the signature with the sender's public key. A digital signature provides two security services: authentication and non- repudiation. Authentication means that the receiver can confirm the identity of the sender, and non- repudiation means that the sender cannot deny sending the message12.
* A digital signature mechanism consists of three algorithms: key generation, signing, and verification.
Key generation produces a pair of keys: a private key for the sender and a public key for the receiver.
Signing takes the message and the private key as inputs, and outputs a signature. Verification takes the message, the signature, and the public key as inputs, and outputs a boolean value indicating whether the signature is valid or not12.
* A digital signature mechanism can be implemented using various cryptographic techniques, such as hash-based signatures, RSA signatures, or elliptic curve signatures. A common method is to use a hash function to compress the message into a fixed-length digest, and then use an asymmetric encryption algorithm to encrypt the digest with the private key. The encrypted digest is the signature, which can be decrypted with the public key and compared with the hash of the message to verify the integrity12.
A digital signature mechanism can ensure the integrity of the data upon retrieval, because:
* A digital signature is unique to the message and the sender, and it cannot be forged or altered by anyone else. If the message or the signature is modified in any way, the verification will fail and the receiver will know that the data is corrupted or tampered with12.
* A digital signature is independent of the encryption or hashing of the data, and it can be applied to any type of data, regardless of its format or size. The encryption or hashing of the data can provide confidentiality and efficiency, but they cannot provide integrity or authentication by themselves. A digital signature can complement the encryption or hashing of the data by providing an additional layer of security12.
The other options are not as suitable as option B for the following reasons:
* A. Implement a block cipher mode of operation: This option is not relevant because it does not address the integrity verification issue, but the encryption issue. A block cipher mode of operation is a method of applying a block cipher, which is a symmetric encryption algorithm that operates on fixed-length blocks of data, to a variable-length message. A block cipher mode of operation can provide different security properties, such as confidentiality, integrity, or authenticity, depending on the mode. However, a block cipher mode of operation cannot provide a digital signature, which is a form of asymmetric encryption that uses a pair of keys3 .
* C. Suggest using salt with hashing: This option is not sufficient because it does not provide a digital signature, but only a hash value. Salt is a random value that is added to the input of a hash function, which is a one-way function that maps any data to a fixed-length digest. Salt can enhance the security of hashing by making it harder to perform brute-force attacks or dictionary attacks, which are methods of finding the input that produces a given hash value. However, salt cannot provide a digital signature, which is a two-way function that uses a pair of keys to sign and verify a message .
* D. Switch to elliptic curve cryptography: This option is not specific because it does not specify a digital signature mechanism, but only a type of cryptography. Elliptic curve cryptography is a branch of cryptography that uses mathematical curves to generate keys and perform operations. Elliptic curve cryptography can be used to implement various cryptographic techniques, such as encryption, hashing, or digital signatures. However, elliptic curve cryptography is not a digital signature mechanism by itself, but rather a tool that can be used to create one .
References:
* 1: Digital signature - Wikipedia
* 2: Digital Signature: What It Is and How It Works | Kaspersky
* 3: Block cipher mode of operation - Wikipedia
* : Block Cipher Modes of Operation - an overview | ScienceDirect Topics
* : Salt (cryptography) - Wikipedia
* : What is Salt in Cryptography? | Cloudflare
* : Elliptic-curve cryptography - Wikipedia
* : Elliptic Curve Cryptography: What It Is and How It Works | Kaspersky


NEW QUESTION # 110
Being a Certified Ethical Hacker (CEH), a company has brought you on board to evaluate the safety measures in place for their network system. The company uses a network time protocol server in the demilitarized zone.
During your enumeration, you decide to run a ntptrace command. Given the syntax: ntptrace [-n] [-m maxhosts] [servername/IP_address], which command usage would best serve your objective to find where the NTP server obtains the time from and to trace the list of NTP servers connected to the network?

  • A. ntptrace -n -m 5 192.168.1.1
  • B. ntptrace -m 5 192.168.1.1
  • C. ntptrace -n localhost
  • D. tptrace 192.1681.

Answer: A

Explanation:
The command usage that would best serve your objective to find where the NTP server obtains the time from and to trace the list of NTP servers connected to the network is ntptrace -n -m 5 192.168.1.1. This command usage works as follows:
* ntptrace is a tool that determines where a given NTP server gets its time from, and follows the chain of NTP servers back to their master time source. For example, a stratum 0 server, which is a device that directly obtains the time from a physical source, such as an atomic clock or a GPS receiver1.
* -n is a flag that outputs host IP addresses instead of host names. This can be useful if the host names are not resolvable or if the IP addresses are more informative1.
* -m 5 is a flag that specifies the maximum number of hosts to be traced. This can be useful to limit the output and avoid tracing irrelevant or unreachable hosts1.
* 192.168.1.1 is the IP address of the NTP server in the demilitarized zone, which is the starting point of the trace. This can be useful to find out the source and the path of the time synchronization for the network system1.
By using this command usage, the output will show the IP addresses, the stratum, the offset, the sync distance, and the reference ID of each NTP server in the chain, up to five hosts. This can provide valuable information about the accuracy, the reliability, and the security of the time service for the network system1.
The other options are not as suitable as option D for the following reasons:
* A. ntptrace -m 5 192.168.1.1: This option is similar to option D, but it does not use the -n flag, which means that it will output host names instead of IP addresses. This can be less useful if the host names are not resolvable or if the IP addresses are more informative1.
* B. tptrace 192.1681.: This option is incorrect because it uses a wrong tool name and a wrong IP address.
tptrace is not a valid tool name, and 192.1681. is not a valid IP address. The correct tool name is ntptrace, and the correct IP address is 192.168.1.11.
* C. ntptrace -n localhost: This option is not effective because it uses localhost as the starting point of the trace, which means that it will only show the local host's time source. This can be useful to check the local host's time configuration, but it does not help to find out the time source and the trace of the NTP server in the demilitarized zone, which is the objective of this scenario1.
References:
* 1: ntptrace - trace a chain of NTP servers back to the primary source


NEW QUESTION # 111
The following is an entry captured by a network IDS. You are assigned the task of analyzing this entry. You notice the value 0x90, which is the most common NOOP instruction for the Intel processor. You figure that the attacker is attempting a buffer overflow attack.
You also notice "/bin/sh" in the ASCII part of the output.
As an analyst what would you conclude about the attack?

  • A. The attacker is attempting an exploit that launches a command-line shell
  • B. The buffer overflow attack has been neutralized by the IDS
  • C. The attacker is attempting a buffer overflow attack and has succeeded
  • D. The attacker is creating a directory on the compromised machine

Answer: A


NEW QUESTION # 112
An incident investigator asks to receive a copy of the event logs from all firewalls, proxy servers, and Intrusion Detection Systems (IDS) on the network of an organization that has experienced a possible breach of security. When the investigator attempts to correlate the information in all of the logs, the sequence of many of the logged events do not match up.
What is the most likely cause?

  • A. The attacker altered or erased events from the logs.
  • B. Proper chain of custody was not observed while collecting the logs.
  • C. The security breach was a false positive.
  • D. The network devices are not all synchronized.

Answer: D

Explanation:
Many network and system administrators don't pay enough attention to system clock accuracy and time synchronization. Computer clocks can run faster or slower over time, batteries and power sources die, or daylight-saving time changes are forgotten. Sure, there are many more pressing security issues to deal with, but not ensuring that the time on network devices is synchronized can cause problems. And these problems often only come to light after a security incident.
If you suspect a hacker is accessing your network, for example, you will want to analyze your log files to look for any suspicious activity. If your network's security devices do not have synchronized times, the timestamps' inaccuracy makes it impossible to correlate log files from different sources. Not only will you have difficulty in tracking events, but you will also find it difficult to use such evidence in court; you won't be able to illustrate a smooth progression of events as they occurred throughout your network.


NEW QUESTION # 113
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