C839v5/D334 Additional Practice
UPDATED Exam Questions and
CORRECT Answers
128 - Correct Answer-The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256
variable; fixed - Correct Answer-Hashing involves taking a _____ length input and producing
a _____ length output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable
160 - Correct Answer-The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256
128 - Correct Answer-The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256
Transport - Correct Answer-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 - Correct Answer-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. - Correct Answer-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
Chaskey - Correct Answer-_____ 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 - Correct Answer-Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80
salt - Correct Answer-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 - Correct Answer-The minimum recommended key size to use with RC4 is _____ bits.
A. 40
B. 20
C. 64
2048 - Correct Answer-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) - Correct Answer-_____ 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 - Correct Answer-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 - Correct Answer-_____ 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) - Correct Answer-_____ has a block size of 64 bits,
key size of 112 bits, and 48 rounds of substitution & transposition.
A. DES
, B. RSA
C. 3DES
128, 192, 256 - Correct Answer-Key sizes used with the Advanced Encryption Standard
(AES) include _____. _____, or _____.
A. 10, 12, 14
B. 128, 192, 256
C. 32, 64, 80
128 - Correct Answer-The Advanced Encryption Standard (AES) operates using _____ bit
blocks.
A. 128
B. 192
C. 256
80 - Correct Answer-Skipjack is a symmetric block cipher that uses a ______ bit key.
A. 64
B. 80
C. 112
128-bit key size; 64-bit IV - Correct Answer-Enocoro operates with a key size of ______ bits
and an initialization vector (IV) of _____ bits.
A. 80; 80
B. 128; 64
C. 80; 64
64 - Correct Answer-Skipjack has a block size of _____bits.
A. 64
B. 80
C. 128
UPDATED Exam Questions and
CORRECT Answers
128 - Correct Answer-The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256
variable; fixed - Correct Answer-Hashing involves taking a _____ length input and producing
a _____ length output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable
160 - Correct Answer-The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256
128 - Correct Answer-The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256
Transport - Correct Answer-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 - Correct Answer-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. - Correct Answer-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
Chaskey - Correct Answer-_____ 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 - Correct Answer-Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80
salt - Correct Answer-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 - Correct Answer-The minimum recommended key size to use with RC4 is _____ bits.
A. 40
B. 20
C. 64
2048 - Correct Answer-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) - Correct Answer-_____ 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 - Correct Answer-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 - Correct Answer-_____ 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) - Correct Answer-_____ has a block size of 64 bits,
key size of 112 bits, and 48 rounds of substitution & transposition.
A. DES
, B. RSA
C. 3DES
128, 192, 256 - Correct Answer-Key sizes used with the Advanced Encryption Standard
(AES) include _____. _____, or _____.
A. 10, 12, 14
B. 128, 192, 256
C. 32, 64, 80
128 - Correct Answer-The Advanced Encryption Standard (AES) operates using _____ bit
blocks.
A. 128
B. 192
C. 256
80 - Correct Answer-Skipjack is a symmetric block cipher that uses a ______ bit key.
A. 64
B. 80
C. 112
128-bit key size; 64-bit IV - Correct Answer-Enocoro operates with a key size of ______ bits
and an initialization vector (IV) of _____ bits.
A. 80; 80
B. 128; 64
C. 80; 64
64 - Correct Answer-Skipjack has a block size of _____bits.
A. 64
B. 80
C. 128
