多項(xiàng)選擇題Which of the following statements are true? ()

A. RC4 is a stream cipher
B. Stream ciphers require padding
C. AES is a block cipher
D. DES and 3DES are stream ciphers
E. AES is a stream cipher
F. AES, DES, and 3DES can be used as HMAC algorithms


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1.多項(xiàng)選擇題Which of the following statements are true regardinghashing? ()

A. MD5 produces a 160-bit result.
B. SHA-256 is an extension to SHA-1 with a longer output.
C. MD5 takes more CPU cycles to compute than SHA-1.
D. Changing1 bit of the input to SHA-1 changes 1 bit of the output.
E. SHA-1 is stronger than MD5 because it can be used with a key to prevent modification.

2.多項(xiàng)選擇題Which two steps does a receiver perform to validate a message using HMAC? ()  

A. decrypts the received MAC using a secret key
B. compares the computed MAC vs. the MAC received
C. authenticate the receivedmessage using the sender’s public key
D. look up the sender’s public key
E. extracts the MAC from the receivedmessage thenencrypts the received message with a secret keyto producethe MAC
F. Computes the MAC using the receivedmessage and a secret key as inputs to the hash function

3.單項(xiàng)選擇題Which of the following best describes a hash function?()

A.An irreversible fast encryption method
B.A reversible fast encryption method
C.A reversible value computed from a piece of data and used to detect modifications
D.An irreversible value computed froma piece of data and used to detect modifications
E.A table inwhich values are stored for efficient retrieval.

4.單項(xiàng)選擇題What does qos pre-classify provides inregardto implementing QoS over GRE/IPSec VPN tunnels?()

A. enables IOS to copy the ToS field from the inner (original) IPheader to theouter tunnel IP header
B. enables IOS to make a copy of the inner (original) IP header and to run a QoS classification before encryption, based on fields in the inner IP header.
C. enables IOS to classify packets based on the ToS field in the inner (original) IP header
D. enables IOS to classify packets based on the ToS field in the outer tunnel IP header
E. enables the IOS classification engine to only see a single encrypted and tunneledflow to reduce classification complexity

5.多項(xiàng)選擇題Asymmetric and symmetric ciphers differ in which of the following way(s)? () 

A.Asymmetric ciphers use pre-shared keys
B.Symmetric ciphers are faster to compute
C.Asymmetric ciphers are faster to compute
D.Asymmetric ciphers use public and private

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