212-81 試験問題を無料オンラインアクセス

Which of the following is a protocol for exchanging keys?

• A.DH
• B.AES
• C.RSA
• D.EC

John is responsible for VPNs at his company. He is using IPSec because it has two different modes. He can choose the mode appropriate for a given situation. What are the two modes of IPSec? (Choose two)

• A.Transport mode
• B.Decrypt mode
• C.Encrypt mode
• D.Tunnel mode

Which one of the following is a component of the PKI?

• A.TGS
• B.TGT
• C.CA
• D.OCSP

With Electronic codebook (ECB) what happens:

• A.The cipher text from the current round is XORed with the plaintext for the next round
• B.The block cipher is turned into a stream cipher
• C.The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
• D.The cipher text from the current round is XORed with the plaintext from the previous round

Created by D. H. Lehmer. It is a classic example of a Linear congruential generator. A PRNG type of linear congruential generator (LCG) that operates in multiplicative group of integers modulo n. The basic algorithm is Xi+1=(aXi + c) mod m, with 0 ≤ Xi ≤ m.

• A.Lehmer Random Number Generator
• B.Lagged Fibonacci Generator
• C.Blum Blum Shub
• D.Linear Congruential Generator