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Master the Certified Ethical Hacker Exam 312-50 Exam with Confidence!

Questions 11

An attacker sniffs encrypted traffic from the network and is subsequently able to decrypt it. The attacker can now use which cryptanalytic technique to attempt to discover the encryption key?

Options:

A.

Birthday attack

B.

Plaintext attack

C.

Meet in the middle attack

D.

Chosen ciphertext attack

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Questions 12

A network security administrator is worried about potential man-in-the-middle attacks when users access a corporate web site from their workstations. Which of the following is the best remediation against this type of attack?

Options:

A.

Implementing server-side PKI certificates for all connections

B.

Mandating only client-side PKI certificates for all connections

C.

Requiring client and server PKI certificates for all connections

D.

Requiring strong authentication for all DNS queries

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Questions 13

Which of the following is a characteristic of Public Key Infrastructure (PKI)?

Options:

A.

Public-key cryptosystems are faster than symmetric-key cryptosystems.

B.

Public-key cryptosystems distribute public-keys within digital signatures.

C.

Public-key cryptosystems do not require a secure key distribution channel.

D.

Public-key cryptosystems do not provide technical non-repudiation via digital signatures.

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Questions 14

Which element of Public Key Infrastructure (PKI) verifies the applicant?

Options:

A.

Certificate authority

B.

Validation authority

C.

Registration authority

D.

Verification authority

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Questions 15

While testing the company's web applications, a tester attempts to insert the following test script into the search area on the company's web site:

<script>alert(" Testing Testing Testing ")</script>

Afterwards, when the tester presses the search button, a pop-up box appears on the screen with the text: "Testing Testing Testing". Which vulnerability has been detected in the web application?

Options:

A.

Buffer overflow

B.

Cross-site request forgery

C.

Distributed denial of service

D.

Cross-site scripting

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Questions 16

To reduce the attack surface of a system, administrators should perform which of the following processes to remove unnecessary software, services, and insecure configuration settings?

Options:

A.

Harvesting

B.

Windowing

C.

Hardening

D.

Stealthing

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Questions 17

When setting up a wireless network, an administrator enters a pre-shared key for security. Which of the following is true?

Options:

A.

The key entered is a symmetric key used to encrypt the wireless data.

B.

The key entered is a hash that is used to prove the integrity of the wireless data.

C.

The key entered is based on the Diffie-Hellman method.

D.

The key is an RSA key used to encrypt the wireless data.

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Questions 18

The intrusion detection system at a software development company suddenly generates multiple alerts regarding attacks against the company's external webserver, VPN concentrator, and DNS servers. What should the security team do to determine which alerts to check first?

Options:

A.

Investigate based on the maintenance schedule of the affected systems.

B.

Investigate based on the service level agreements of the systems.

C.

Investigate based on the potential effect of the incident.

D.

Investigate based on the order that the alerts arrived in.

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Questions 19

For messages sent through an insecure channel, a properly implemented digital signature gives the receiver reason to believe the message was sent by the claimed sender. While using a digital signature, the message digest is encrypted with which key?

Options:

A.

Sender's public key

B.

Receiver's private key

C.

Receiver's public key

D.

Sender's private key

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Questions 20

A Certificate Authority (CA) generates a key pair that will be used for encryption and decryption of email. The integrity of the encrypted email is dependent on the security of which of the following?

Options:

A.

Public key

B.

Private key

C.

Modulus length

D.

Email server certificate

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