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Which two options are symmetric-key algorithms that are recommended by Cisco?

Which two options are symmetric-key algorithms that are recommended by Cisco? (Choose two.)

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A.
Twofish

B.
Advanced Encryption Standard

C.
Blowfish

D.
Triple Data Encryption Standard

Explanation:
Recommendations for Cryptographic Algorithms
Algorithm
Operation
Status
Alternative
DES
Encryption
Avoid
AES
3DES
Encryption
Legacy
AES
Symmetric key algorithms use the same key for encryption and decryption. Examples include
3DES and AES. 3DES, which consists of three sequential Data Encryption Standard (DES)
encryption-decryptions, is a legacy algorithm. This designation means 3DES provides a marginal
but acceptable security level, but its keys should be renewed relatively often. Because of its small
key size, DES is no longer secure and should be avoided. RC4 should be avoided as well.
AES with 128-bit keys provides adequate protection for sensitive information. AES with 256-bit
keys is required to protect classified information of higher importance.
Reference: http://www.cisco.com/web/about/security/intelligence/nextgen_crypto.html


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