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CCNA Security Chapter 7 Exam
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Perguntas do quiz (22)
1What is the focus of cryptanalysis?
- Ahiding secret codes
- Bdeveloping secret codes
- Cbreaking encrypted codes
- Dimplementing encrypted codes
2How many bits does the Data Encryption Standard (DES) use for data encryption?
- A40 bits
- B56 bits
- C64 bits
- D72 bits
3Which statement describes the Software-Optimized Encryption Algorithm (SEAL)?
- ASEAL is a stream cipher
- BIt uses a 112-bit encryption key.
- CIt is an example of an asymmetric algorithm.
- DIt requires more CPU resources than software-based AES does.
4Which encryption algorithm is an asymmetric algorithm?
- ADH
- BSEAL
- C3DES
- DAES
5An 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
6In which situation is an asymmetric key algorithm used
- ATwo Cisco routers authenticate each other with CHAP
- BUser data is transmitted across the network after a VPN is established
- CAn office manager encrypts confidential files before saving them to a removable device
- DِِِA network administrator connects to a Cisco router with SSH
7What 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
8Which objective of secure communications is achieved by encrypting data
- Aintegrity
- Bauthentication
- Cconfidentiality
- Davailability
9Why is the 3DES algorithm often preferred over the AES algorithm
- A3DES is more trusted because it has been proven secure for a longer period than AES
- BAES is more expensive to implement than 3DES.
- C3DES performs better in high-throughput, low-latency environments than AES
- DMajor networking equipment vendors such as Cisco have not yet adopted AES.
10What is the most common use of the Diffie-Helman algorithm in communications security?
- Ato create password hashes for secure authentication
- Bto provide routing protocol authentication between routers
- Cto encrypt data for secure e-commerce communications
- Dto secure the exchange of keys used to encrypt data
11Which type of encryption algorithm uses public and private keys to provide authentication, integrity, and confidentiality?
- Asymmetric
- Bshared secret
- CIPsec
- Dasymmetric
12How do modern cryptographers defend against brute-force attacks
- AUse statistical analysis to eliminate the most common encryption keys.
- BUse a keyspace large enough that it takes too much money and too much time to conduct a successful attack
- CUse an algorithm that requires the attacker to have both ciphertext and plaintext to conduct a successful attack
- DUse frequency analysis to ensure that the most popular letters used in the language are not used in the cipher message
13Which encryption protocol provides network layer confidentiality?
- AIPsec protocol suite
- BTransport Layer Security
- CSecure Hash Algorithm 1
- DSecure Sockets Layer
- EKeyed MD5
- FMessage Digest 5
14Refer to the exhibit. Which encryption algorithm is described in the exhibit?
- ARC4
- BAES
- C3DES
- DDES
- ESEAL
15Which statement describes asymmetric encryption algorithms?
- AThey have key lengths ranging from 80 to 256 bits
- BThey include DES, 3DES, and AES.
- CThey are also called shared-secret key algorithms.
- DThey are relatively slow because they are based on difficult computational algorithms
16Which two non-secret numbers are initially agreed upon when the Diffie-Hellman algorithm is used? (Choose two.)
- Abinomial coefficient
- Bgenerator
- Celliptic curve invariant
- Dprime modulus
- Etopological index
- Fpseudorandom nome
17In what situation would an asymmetric algorithm most likely be used?
- Alogging onto a computer
- Bmaking an online purchase
- Cuploading a networking book chapter using FTP
- Dtransferring a large stream of data between two corporate locations
18Why is asymmetric algorithm key management simpler than symmetric algorithm key management?
- AIt uses fewer bits.
- BOnly one key is used.
- CTwo public keys are used for the key exchange.
- DOne of the keys can be made public.
19What is the purpose of code signing
- Asource identity secrecy
- Bintegrity of source .EXE files
- Creliable transfer of data
- Ddata encryption
20Which algorithm can ensure data confidentiality?
- AMD5
- BPKI
- CRSA
- DAES
21What is the purpose of a digital certificate?
- AIt guarantees that a website has not been hacked
- BIt authenticates a website and establishes a secure connection to exchange confidential data.
- CIt provides proof that data has a traditional signature attached
- DIt ensures that the person who is gaining access to a network device is authorized.
22Fill in the blank.
A shared secret is a key used in a ___________ encryption algorithm- Asymmetric
- BNONsymmetric
Informações
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- CCNA Security Chapter 7 Exam
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- d94829 d94829
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