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Cisco 640-553 Exam, Most Accurate Cisco 640-553 Dumps Are The Best Materials
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QUESTION 117
Regarding constructing a good encryption algorithm, what does creating an avalanche effect indicate?
A. Changing only a few bits of a plain-text message causes the ciphertext to be completely different.
B. Changing only a few bits of a ciphertext message causes the plain text to be completely different.
C. Altering the key length causes the plain text to be completely different.
D. Altering the key length causes the ciphertext to be completely different.
Correct Answer: A QUESTION 118
With the increasing development of network, various network attacks appear. Which statement best describes the relationships between the attack method and the result?
A. Ping Sweep – TIS1 and TIS3 Port Scan – TIS2, TIS4 and TIS5
B. Ping Sweep – TIS2 and TIS4 Port Scan – TIS1, TIS3 and TIS5
C. Ping Sweep – TIS1 and TIS5 Port Scan – TIS2, TIS3 and TIS4
D. Ping Sweep – TIS2 and TIS3 Port Scan – TIS1, TIS4 and TIS5
Correct Answer: B QUESTION 119
Stream ciphers run on which of the following?
A. Individual blocks, one at a time, with the transformations varying during the encryption
B. Individual digits, one at a time, with the transformations varying during the encryption
C. Fixed-length groups of digits called blocks
D. Fixed-length groups of bits called blocks
Correct Answer: B QUESTION 120
Which description is true about ECB mode?
A. ECB mode uses the same 64-bit key to serially encrypt each 56-bit plain-text block.
B. In ECB mode, each 56-bit plain-text block is exclusive ORed (XORed) bitwise with the previous ciphertext block.
C. ECB mode uses the same 56-bit key to serially encrypt each 64-bit plain-text block.
D. In ECB mode, each 64-bit plain-text block is exclusive ORed (XORed) bitwise with the previousciphertext block.
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