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C839V5/D334 ADDITIONAL PRACTICE
2026 QUESTIONS AND ANSWERS | A+
GRADED | WITH EXPERT SOLUTIONS
The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256 - correct answer-128
Hashing involves taking a _____ length input and producing a
_____ length output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable - correct answer-variable; fixed
The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256 - correct answer-160
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The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256 - correct answer-128
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 - correct answer-Transport
IPSec ______ mode involves encryption from gateway to
gateway, i.e. just through the public network space.
A. Tunnel
B. Transport
C. Trusted - correct answer-Tunnel
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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 - correct answer-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.
_____ 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. - correct answer-
Chaskey
Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80 - correct answer-128
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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 - correct answer-salt
The minimum recommended key size to use with RC4 is _____
bits.
A. 40
B. 20
C. 64 - correct answer-40
RC4 is a symmetric stream cipher with a variable key size up to a
max of _____ bits.
A. 256
B. 2048
C. 1024 - correct answer-2048
_____ has a block size of 64 bits, key size of 56 bits, and 16
rounds of substitution & transposition.
A. DES
C839V5/D334 ADDITIONAL PRACTICE
2026 QUESTIONS AND ANSWERS | A+
GRADED | WITH EXPERT SOLUTIONS
The hash value in bits for MD5 is ____.
A. 128
B. 160
C. 256 - correct answer-128
Hashing involves taking a _____ length input and producing a
_____ length output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable - correct answer-variable; fixed
The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256 - correct answer-160
, Page | 2
The hash value in bits for MD4 is ____.
A. 128
B. 160
C. 256 - correct answer-128
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 - correct answer-Transport
IPSec ______ mode involves encryption from gateway to
gateway, i.e. just through the public network space.
A. Tunnel
B. Transport
C. Trusted - correct answer-Tunnel
, Page | 3
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 - correct answer-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.
_____ 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. - correct answer-
Chaskey
Chaskey has a key size of _____ bits.
A. 256
B. 128
C. 80 - correct answer-128
, Page | 4
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 - correct answer-salt
The minimum recommended key size to use with RC4 is _____
bits.
A. 40
B. 20
C. 64 - correct answer-40
RC4 is a symmetric stream cipher with a variable key size up to a
max of _____ bits.
A. 256
B. 2048
C. 1024 - correct answer-2048
_____ has a block size of 64 bits, key size of 56 bits, and 16
rounds of substitution & transposition.
A. DES
