Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. Message_____ means that the data must arrive at the receiver exactly as sent.
A) confidentiality
B) integrity
C) authentication
D) none of the above
Answer: Option B
Solution:
2. Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter.
A) confidentiality
B) integrity
C) authentication
D) none of the above
Answer: Option C
Solution:
3. A(n) ________function creates a message digest out of a message.
A) encryption
B) decryption
C) hash
D) none of the above
Answer: Option C
Solution:
4. The secret key between members needs to be created as a ______ key when two members contact KDC.
A) public
B) session
C) complimentary
D) none of the above
Answer: Option B
Solution:
5. The ________ criterion ensures that a message cannot easily be forged.
A) one-wayness
B) weak-collision-resistance
C) strong-collision-resistance
D) none of the above
Answer: Option B
Solution:
6. A(n) _____ is a trusted third party that assigns a symmetric key to two parties.
A) KDC
B) CA
C) KDD
D) none of the above
Answer: Option A
Solution:
7. A witness used in entity authentication is ____________.
A) something known
B) something possessed
C) something inherent
D) all of the above
Answer: Option D
Solution:
8. A _______ message digest is used as an MDC.
A) keyless
B) keyed
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option A
Solution:
9. A(n)______ creates a secret key only between a member and the center.
A) CA
B) KDC
C) KDD
D) none of the above
Answer: Option B
Solution:
10. ________ means to prove the identity of the entity that tries to access the system’s resources.
A) Message authentication
B) Entity authentication
C) Message confidentiality
D) none of the above
Answer: Option B
Solution:
11. A ________ signature is included in the document; a _______ signature is a separate entity.
A) conventional; digital
B) digital; digital
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option A
Solution:
12. If _________ is needed, a cryptosystem must be applied over the scheme.
A) integrity
B) confidentiality
C) nonrepudiation
D) authentication
Answer: Option B
Solution:
13. Digital signature provides ________.
A) authentication
B) nonrepudiation
C) both (a) and (b)
D) neither (a) nor (b)
Answer: Option C
Solution:
14. Digital signature cannot provide ________ for the message.
A) integrity
B) confidentiality
C) nonrepudiation
D) authentication
Answer: Option B
Solution:
15. To authenticate the data origin, one needs a(n) _______.
A) MDC
B) MAC
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option B
Solution:
16. A(n) _________ can be used to preserve the integrity of a document or a message.
A) message digest
B) message summary
C) encrypted message
D) none of the above
Answer: Option A
Solution:
17. Challenge-response authentication can be done using ________.
A) symmetric-key ciphers
B) asymmetric-key ciphers
C) keyed-hash functions
D) all of the above
Answer: Option D
Solution:
18. The _______criterion ensures that we cannot find two messages that hash to the same digest.
A) one-wayness
B) weak-collision-resistance
C) strong-collision-resistance
D) none of the above
Answer: Option C
Solution:
19. A digital signature needs a(n)_________ system.
A) symmetric-key
B) asymmetric-key
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option B
Solution:
20. A(n) ________is a federal or state organization that binds a public key to an entity and issues a certificate.
A) KDC
B) Kerberos
C) CA
D) none of the above
Answer: Option C
Solution:
21. Message ________ means that the sender and the receiver expect privacy.
A) confidentiality
B) integrity
C) authentication
D) none of the above
Answer: Option A
Solution:
22. In ________ authentication, the claimant proves that she knows a secret without actually sending it.
A) password-based
B) challenge-response
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option B
Solution:
23. In _______, a claimant proves her identity to the verifier by using one of the three kinds of witnesses.
A) message authentication
B) entity authentication
C) message confidentiality
D) message integrity
Answer: Option B
Solution:
24. The _______ criterion states that it must be extremely difficult or impossible to create the message if the message digest is given.
A) one-wayness
B) weak-collision-resistance
C) strong-collision-resistance
D) none of the above
Answer: Option A
Solution:
25. A(n) ______ is a hierarchical system that answers queries about key certification.
A) KDC
B) PKI
C) CA
D) none of the above
Answer: Option C
Solution:
26. _________ means that a sender must not be able to deny sending a message that he sent.
A) Confidentiality
B) Integrity
C) Authentication
D) Nonrepudiation
Answer: Option D
Solution:
27. A hash function must meet ________ criteria.
A) two
B) three
C) four
D) none of the above
Answer: Option B
Solution:
28. __________ is a popular session key creator protocol that requires an authentication server and a ticket-granting server.
A) KDC
B) Kerberos
C) CA
D) none of the above
Answer: Option B
Solution:
29. Password-based authentication can be divided into two broad categories: _______ and _______.
A) fixed; variable
B) time-stamped; fixed
C) fixed; one-time
D) none of the above
Answer: Option C
Solution:
Complete List of Chapter Quiz in Data Communications and Networking
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