C839V5/D334 ADDITIONAL PRACTICE
QUESTIONS AND 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
QUESTIONS AND 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
