C839v5 D334 Additional Practice Test Questions & Correct Answers | Study Guide

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C839v5/D334 Additional Practice Test
Questions with Correct Answers

128

The hash value in bits for MD5 is ____.

A. 128

B. 160

C. 256




variable; fixed

Hashing involves taking a _____ length input and producing a _____ length output (message digest).

A. fixed; fixed

B. variable; fixed

C. fixed; variable




160

The hash value in bits for SHA-1 is ____.

A. 128

B. 160

C. 256




128

The hash value in bits for MD4 is ____.

A. 128




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B. 160

C. 256




Transport

IPSec ______ mode involves "end-to-end" encryption; i.e. data remains encrypted from the time it
leaves a sender's device to the time it arrives at the receiver's device.

A. Tunnel

B. Transport

C. Trusted




Tunnel

IPSec ______ mode involves encryption from gateway to gateway, i.e. just through the public network
space.

A. Tunnel

B. Transport

C. Trusted




Tunnel



Remember, with tunnel mode, encryption does not happen until just before it leaves the local network.
Traffic likely remains unencrypted between the end user device and the local network boundary.

A security analyst on a local network using monitoring tools is likely to only be able to read contents of
traffic encrypted using IPSec ______ mode.

A. Tunnel

B. Transport

C. Trusted




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Chaskey

_____ is a lightweight cryptography method for signing messages (MAC). It boasts a relatively
undemanding hardware implementation (only ~3,333 gates required at 1MHz clock rate) making it
suitable for IoT implementation.




128

Chaskey has a key size of _____ bits.

A. 256

B. 128

C. 80




salt

A weakness of one-way hashing is that the same piece of plaintext will result in the same ciphertext
unless _____ is applied.

A. Salt

B. Ash

C. Ether




40

The minimum recommended key size to use with RC4 is _____ bits.

A. 40

B. 20

C. 64




2048




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RC4 is a symmetric stream cipher with a variable key size up to a max of _____ bits.

A. 256

B. 2048

C. 1024




Data Encryption Standard (DES)

_____ has a block size of 64 bits, key size of 56 bits, and 16 rounds of substitution & transposition.

A. DES

B. AES

C. RC4




rainbow table

A(n) _____ is a collection of precomputed hash values of actual plaintext passwords used for password
cracking.

A. initialization vector

B. key pair

C. rainbow table




.cer

_____ is a common x.509 certificate file type that is used with both PEM and DER formats.

A. .crt

B. .cer

C. .der




Triple Data Encryption Standard (3DES)




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