CCNA Security Chapter 7 Quiz & Exam

1. 1What are two symmetric encryption algorithms? (Choose two

   1. A3DES
   2. BMD5
   3. CAES
   4. DHMAC
   5. ESHA
2. 2Which requirement of secure communications is ensured by the implementation of MD5 or SHA hash generating algorithms?​

   1. Aconfidentiality
   2. Bintegrity
   3. Cnonrepudiation
   4. Dauthentication
3. 3What is the reason for HMAC to use an additional secret key as input to the hash function?

   1. Ato provide encryption
   2. Bto provide authentication
   3. Cto provide integrity verification
   4. Dto prevent DoS attacks
4. 4What is a difference between symmetric and asymmetric encryption algorithms?

   1. ASymmetric algorithms are typically hundreds to thousands of times slower than asymmetric algorithms.
   2. BSymmetric encryption algorithms are used to authenticate secure communications. Asymmetric encryption algorithms are used to repudiate messages.
   3. CSymmetric encryption algorithms are used to encrypt data. Asymmetric encryption algorithms are used to decrypt data.
   4. DSymmetric encryption algorithms use pre-shared keys. Asymmetric encryption algorithms use different keys to encrypt and decrypt data.
5. 5If an asymmetric algorithm uses a public key to encrypt data, what is used to decrypt it?

   1. ADH
   2. Ba private key
   3. Ca digital certificate
   4. Da different public key
6. 6The following message was encrypted using a Caesar cipher with a key of 2:
   
   fghgpf vjg ecuvng
   
   What is the plaintext message?​

   1. Adefend the region
   2. Binvade the castle
   3. Cdefend the castle
   4. Dinvade the region
7. 7A customer purchases an item from an e-commerce site. The e-commerce site must maintain proof that the data exchange took place between the site and the customer. Which feature of digital signatures is required?

   1. Aauthenticity of digitally signed data
   2. Bintegrity of digitally signed data
   3. Cnonrepudiation of the transaction
   4. Dconfidentiality of the public key
8. 8What is the purpose of the DH algorithm?

   1. Ato provide nonrepudiation support
   2. Bto support email data confidentiality
   3. Cto encrypt data traffic after a VPN is established
   4. Dto generate a shared secret between two hosts that have not communicated before
9. 9Fill in the blank. Authentication,__________, and confidentiality are the three objectives of secure communications.

   1. Aintegrity
   2. Bnonintegrity
10. 10Which two statements correctly describe certificate classes used in the PKI? (Choose two.)

    1. AA class 0 certificate is for testing purposes.
    2. BA class 0 certificate is more trusted than a class 1 certificate
    3. CThe lower the class number, the more trusted the certificate
    4. DA class 5 certificate is for users with a focus on verification of email.
    5. EA class 4 certificate is for online business transactions between companies.

11. 11A network administrator is forced to use DES on aging equipment. What is one thing the administrator should do in this situation?

    1. AUse ECC instead of parity.
    2. BIncrease the key length
    3. CImplement CBC mode.
    4. DIncrease the number of bits used for encryption.
12. 12What are the two important components of a public key infrastructure (PKI) used in network security? (Choose two.)

    1. Aintrusion prevention system
    2. Bcertificate authority
    3. Cdigital certificates
    4. Dpre-shared key generation
    5. Esymmetric encryption algorithms
13. 13Fill in the blank.
    The SHA-224, SHA-256, SHA-384, and SHA-512 hash functions are known collectively as________algorithms.

    1. ASHA-2
    2. BSHA2
    3. CSHA 2
14. 14Which type of attack does the use of HMACs protect against?

    1. ADoS
    2. BDDoS
    3. Cbrute force
    4. Dman-in-the-middle
15. 15What is the service framework that is needed to support large-scale public key-based technologies?

    1. AHMAC
    2. BPKI
    3. CRSA
    4. D3DES
16. 16What is the focus of cryptanalysis?

    1. Ahiding secret codes
    2. Bdeveloping secret codes
    3. Cbreaking encrypted codes
    4. Dimplementing encrypted codes
17. 17How many bits does the Data Encryption Standard (DES) use for data encryption?

    1. A40 bits
    2. B56 bits
    3. C64 bits
    4. D72 bits
18. 18Which statement describes the Software-Optimized Encryption Algorithm (SEAL)?

    1. ASEAL is a stream cipher
    2. BIt uses a 112-bit encryption key.
    3. CIt is an example of an asymmetric algorithm.
    4. DIt requires more CPU resources than software-based AES does.
19. 19Which encryption algorithm is an asymmetric algorithm?

    1. ADH
    2. BSEAL
    3. C3DES
    4. DAES
20. 20An online retailer needs a service to support the nonrepudiation of the transaction. Which component is used for this service?

    1. Athe private key of the retailer
    2. Bthe unique shared secret known only by the retailer and the customer
    3. Cthe public key of the retailer
    4. Dthe digital signatures
21. 21In which situation is an asymmetric key algorithm used

    1. ATwo Cisco routers authenticate each other with CHAP
    2. BUser data is transmitted across the network after a VPN is established
    3. CAn office manager encrypts confidential files before saving them to a removable device
    4. DِِِA network administrator connects to a Cisco router with SSH
22. 22What is the purpose of a nonrepudiation service in secure communications?

    1. Ato ensure that encrypted secure communications cannot be decoded
    2. Bto confirm the identity of the recipient of the communications
    3. Cto provide the highest encryption level possible
    4. Dto ensure that the source of the communications is confirmed
23. 23Which objective of secure communications is achieved by encrypting data

    1. Aintegrity
    2. Bauthentication
    3. Cconfidentiality
    4. Davailability
24. 24Why is the 3DES algorithm often preferred over the AES algorithm

    1. A3DES is more trusted because it has been proven secure for a longer period than AES
    2. BAES is more expensive to implement than 3DES.
    3. C3DES performs better in high-throughput, low-latency environments than AES
    4. DMajor networking equipment vendors such as Cisco have not yet adopted AES.
25. 25What is the most common use of the Diffie-Helman algorithm in communications security?

    1. Ato create password hashes for secure authentication
    2. Bto provide routing protocol authentication between routers
    3. Cto encrypt data for secure e-commerce communications
    4. Dto secure the exchange of keys used to encrypt data
26. 26Which type of encryption algorithm uses public and private keys to provide authentication, integrity, and confidentiality?

    1. Asymmetric
    2. Bshared secret
    3. CIPsec
    4. Dasymmetric
27. 27How do modern cryptographers defend against brute-force attacks

    1. AUse statistical analysis to eliminate the most common encryption keys.
    2. BUse a keyspace large enough that it takes too much money and too much time to conduct a successful attack
    3. CUse an algorithm that requires the attacker to have both ciphertext and plaintext to conduct a successful attack
    4. DUse frequency analysis to ensure that the most popular letters used in the language are not used in the cipher message
28. 28Which encryption protocol provides network layer confidentiality?

    1. AIPsec protocol suite
    2. BTransport Layer Security
    3. CSecure Hash Algorithm 1
    4. DSecure Sockets Layer
    5. EKeyed MD5
    6. FMessage Digest 5
29. 29Refer to the exhibit. Which encryption algorithm is described in the exhibit?

    

    1. ARC4
    2. BAES
    3. C3DES
    4. DDES
    5. ESEAL
30. 30Which statement describes asymmetric encryption algorithms?

    1. AThey have key lengths ranging from 80 to 256 bits
    2. BThey include DES, 3DES, and AES.
    3. CThey are also called shared-secret key algorithms.
    4. DThey are relatively slow because they are based on difficult computational algorithms
31. 31Which two non-secret numbers are initially agreed upon when the Diffie-Hellman algorithm is used? (Choose two.)

    1. Abinomial coefficient
    2. Bgenerator
    3. Celliptic curve invariant
    4. Dprime modulus
    5. Etopological index
    6. Fpseudorandom nome
32. 32In what situation would an asymmetric algorithm most likely be used?

    1. Alogging onto a computer
    2. Bmaking an online purchase
    3. Cuploading a networking book chapter using FTP
    4. Dtransferring a large stream of data between two corporate locations
33. 33Why is asymmetric algorithm key management simpler than symmetric algorithm key management?

    1. AIt uses fewer bits.
    2. BOnly one key is used.
    3. CTwo public keys are used for the key exchange.
    4. DOne of the keys can be made public.
34. 34What is the purpose of code signing

    1. Asource identity secrecy
    2. Bintegrity of source .EXE files
    3. Creliable transfer of data
    4. Ddata encryption
35. 35Which algorithm can ensure data confidentiality?

    1. AMD5
    2. BPKI
    3. CRSA
    4. DAES
36. 36What is the purpose of a digital certificate?

    1. AIt guarantees that a website has not been hacked
    2. BIt authenticates a website and establishes a secure connection to exchange confidential data.
    3. CIt provides proof that data has a traditional signature attached
    4. DIt ensures that the person who is gaining access to a network device is authorized.
37. 37Fill in the blank.
    A shared secret is a key used in a ___________ encryption algorithm

    1. Asymmetric
    2. BNONsymmetric

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CCNA Security Chapter 7 Quiz & Exam

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