CISSP Practice Questions & Answers: Updated A+ Guide

Which of the following are NOT operating modes of the DES encryption algorithm? A) CBC B) ECB C) CFB D) OFB E) CBE (Ans- e. DES has four modes of operations: CBC - Cipher Block Chaining. In CBC mode, each plaintext block is XORed with the previous cipher text block and then encrypted. ECB - Electronic Code Book. In ECB mode, each plaintext block is encrypted independently with the block cipher. CFB - Cipher Feedback. In CFB mode, the previous cipher text block is encrypted and the output produced is combined with the plaintext block using XOR to produce the current cipher text block. OFB - Output Feedback. OFB mode is similar to CFB mode except that the quantity XORed with each plaintext block is generated independently of both the plaintext and cipher text. Which formula can be used to calculate the Annualized Loss Expectancy (ALE)? A) SLE (Single Loss Expectancy) + ARO (Annualized Rate of Occurrence) B) Asset Value * EF (Exposure Factor) C) Asset Value * EF (Exposure Factor) * ARO (Annualized Rate of Occurrence) D) SLE (Single Loss Expectancy) * ARO (Annualized Rate of Occurrence) * Asset Value (Ans- c; Which of the following protocols can be used to translate a physical address, such as an Ethernet address, into a logical IP address? A) ARP B) PPP C) RARP D) ICMP E) SLIPWhich of the following are NOT operating modes of the DES encryption algorithm? A) CBC B) ECB C) CFB D) OFB E) CBE (Ans- e. DES has four modes of operations: CBC - Cipher Block Chaining. In CBC mode, each plaintext block is XORed with the previous cipher text block and then encrypted. ECB - Electronic Code Book. In ECB mode, each plaintext block is encrypted independently with the block cipher. CFB - Cipher Feedback. In CFB mode, the previous cipher text block is encrypted and the output produced is combined with the plaintext block using XOR to produce the current cipher text block. OFB - Output Feedback. OFB mode is similar to CFB mode except that the quantity XORed with each plaintext block is generated independently of both the plaintext and cipher text. Which formula can be used to calculate the Annualized Loss Expectancy (ALE)? A) SLE (Single Loss Expectancy) + ARO (Annualized Rate of Occurrence) B) Asset Value * EF (Exposure Factor) C) Asset Value * EF (Exposure Factor) * ARO (Annualized Rate of Occurrence) D) SLE (Single Loss Expectancy) * ARO (Annualized Rate of Occurrence) * Asset Value (Ans- c; Which of the following protocols can be used to translate a physical address, such as an Ethernet address, into a logical IP address? A) ARP B) PPP C) RARP D) ICMP E) SLIP