Which of the following factors affect transmission rate in DSL?

• A. The gauge of the twisted-pair line
• B. Degree of electrical interfernece
• C. Shadow fading
• D. The gauge of the twisted-pair line and degree of electrical interference

What is the preferred way of encryption?

• A. Pre shared secret key
• B. Using key distribution center (kdc)
• C. Public key-encryption
• D. Symmetric key

What is not a role of encryption?

• A. It is used to protect data from unauthorized access during transmission
• B. It is used to ensure user authentication
• C. It is used to ensure data integrity
• D. It is used to ensure data corruption doesn’t happens

What is cipher-block chaining?

• A. Data is logically €?anded’ with previous block
• B. Data is logically €?ored’ with previous block
• C. Data is logically €?xored’ with previous block
• D. None of the mentioned

What is not an encryption standard?

• A. Aes
• B. Tes
• C. Triple des
• D. Des

Which of the following is not a stream cipher?

• A. Two fish
• B. Rc5
• C. Rc4
• D. Tbone

What is a Hash Function?

• A. It creates a small flexible block of data
• B. It creates a small,fixed block of data
• C. It creates a encrypted block of data
• D. None of the mentioned

MD5 produces __________ bits hash data.

• A. 128
• B. 150
• C. 160
• D. 112

SHA-1 produces __________ bit of hash.

• A. 128
• B. 160
• C. 150
• D. 112

Which two of the following are authentication algorithms?

• A. Mac
• B. Aes
• C. Das
• D. Digital-signature