Test
Chapter 7
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Preguntas del test (22)
1Authentication, [blank_start]integrity[blank_end], and confidentiality are the three objectives of secure communications
- Aintegrity
2[blank_start]56[blank_end] bits long is for Data Encryption Standard (DES) use for data encryption.
- A56
3The type of encryption algorithm that uses public and private keys to provide authentication, integrity, and confidentiality [blank_start]asymmetric[blank_end].
- Aasymmetric
4A shared secret is a key used in a [blank_start]symmetric[blank_end] encryption algorithm
- Asymmetric
5The SHA-224, SHA-256, SHA-384, and SHA-512 hash functions are known collectively as [blank_start]SHA-2[blank_end] algorithms.
- ASHA-2
6What is the purpose of the DH algorithm?
- Ato provide nonrepudiation support
- Bto support email data confidentiality
- Cto generate a shared secret between two hosts that have not communicated before
- Dto encrypt data traffic after a VPN is established
7Why is the 3DES algorithm often preferred over the AES algorithm?
- AAES is more expensive to implement than 3DES.
- B3DES performs better in high-throughput, low-latency environments than AES.
- CMajor networking equipment vendors such as Cisco have not yet adopted AES.
- D3DES is more trusted because it has been proven secure for a longer period than AES.
8What is the reason for HMAC to use an additional secret key as input to the hash function?
- Ato provide encryption
- Bto prevent DoS attacks
- Cto provide authentication
- Dto provide integrity verification
9A network administrator is forced to use DES on aging equipment. What is one thing the administrator should do in this situation?
- AUse ECC instead of parity.
- BImplement CBC mode.
- CIncrease the number of bits used for encryption.
- DIncrease the key length.
10The following message was encrypted using a Caesar cipher with a key of 2:
fghgpf vjg ecuvng
What is the plaintext message?- Adefend the region
- Bdefend the castle
- Cinvade the castle
- Dinvade the region
11If an asymmetric algorithm uses a public key to encrypt data, what is used to decrypt it?
- ADH
- Ba private key
- Ca digital certificate
- Da different public key
12What is the service framework that is needed to support large-scale public key-based technologies?
- AHMAC
- BPKI
- CRSA
- DDH
13Which objective of secure communications is achieved by encrypting data?
- Aintegrity
- Bconfidentiality
- Cavailabilty
- Dauthentication
14Which encryption algorithm is an asymmetric algorithm?
- ADH
- B3DES
- CSEAL
- DAES
15What is the purpose of a nonrepudiation service in secure communications?
- Ato ensure that encrypted secure communications cannot be decoded
- Bto confirm the identity of the recipient of the communications
- Cto provide the highest encryption level possible
- Dto ensure that the source of the communications is confirmed
16What is the most common use of the Diffie-Helman algorithm in communications security?
- Ato secure the exchange of keys used to encrypt data
- Bto create password hashes for secure authentication
- Cto provide routing protocol authentication between routers
- Dto encrypt data for secure e-commerce communications
17An online retailer needs a service to support the nonrepudiation of the transaction. Which component is used for this service?
- Athe private key of the retailer
- Bthe unique shared secret known only by the retailer and the customer
- Cthe public key of the retailer
- Dthe digital signatures
18What is a difference between symmetric and asymmetric encryption algorithms?
- ASymmetric algorithms are typically hundreds to thousands of times slower than asymmetric algorithms.
- BSymmetric encryption algorithms are used to authenticate secure communications. Asymmetric encryption algorithms are used to repudiate messages.
- CSymmetric encryption algorithms are used to encrypt data. Asymmetric encryption algorithms are used to decrypt data.
- DSymmetric encryption algorithms use pre-shared keys. Asymmetric encryption algorithms use different keys to encrypt and decrypt data.
19What is the focus of cryptanalysis?
- Ahiding secret codes
- Bdeveloping secret codes
- Cbreaking encrypted codes
- Dimplementing encrypted codes
20Which requirement of secure communications is ensured by the implementation of MD5 or SHA hash generating algorithms?
- Aconfidentiality
- Bauthentication
- Cintegrity
- Dnonrepudation
21Which type of attack does the use of HMACs protect against?
- ADoS
- BDDoS
- Cbrute force
- Dman-in-the-middle
22What are two symmetric encryption algorithms? (Choose two.)
- A3DES
- BMD5
- CAES
- DHMAC
- ESHA
Información
- Descripción
- ITELEC Test sobre Chapter 7, creado por K eations el 14/12/2018.
- Autor
- K eations
- Idioma
- English
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