Free CREST CREST-CPSA Exam Questions

Become CREST Certified with updated CREST-CPSA exam questions and correct answers

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Total 359 Questions | Updated On: Oct 27, 2026

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Question 1

In CBC mode, how is each plaintext block encrypted before being XORed with the previous ciphertext block?

A : XORing each plaintext block with the previous ciphertext block before encryption

B : Using a cryptographic nonce as the encryption key

C : Using a unique initialization vector (IV) for each block

D : Using a different key for each block

E : Using the same encryption key for each block

Answer: E

Question 2

How many possible hosts are in /25 network?

A : 156

B : 6619999

C : 192

D : 64

E : 128

Answer: E

Question 3

What are the SIP and RTP protocols used for in VoIP?

A : SIP and RTP are competing protocols that are both used for audio data transmission.

B : RTP is used for setting up and closing down calls, and SIP is used for audio data transmission.

C : SIP and RTP are competing protocols that are both used for setting up and tearing down calls.

D : SIP is used for setting up and closing down calls, and RTP is used for audio data transmission.

E : SIP is used for setting up and closing down calls, but RTP is nothing to do with VoIP.

Answer: D

Question 4

In CBC mode, how is each plaintext block encrypted before being XORed with the previous ciphertext block?

A : XORing each plaintext block with the previous ciphertext block before encryption

B : Using a cryptographic nonce as the encryption key

C : Using a unique initialization vector (IV) for each block

D : Using a different key for each block

E : Using the same encryption key for each block

Answer: E

Question 5

On which Port does Oracle TNS listen?

A : 1521

B : 2433

C : 5667

D : 1566

E : 5666

Answer: A

Page: 1 / 72

Total 359 Questions | Updated On: Oct 27, 2026

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