Computer networks and the Internet are the prime mode of Information transfer today. Which of
the following is a technique used for modifying messages, providing Information and Cyber security,
and reducing the risk of hacking attacks during communications and message passing over the
Internet?

Which of the following are the primary components of a discretionary access control (DAC) model?
Each correct answer represents a complete solution. Choose two.

You work as a technician for Trade Well Inc. The company is in the business of share trading. To
enhance security, the company wants users to provide a third key (apart from ID and password) to
access the company’s Web site. Which of the following technologies will you implement to
accomplish the task?

Which of the following encryption modes can make protocols without integrity protection even
more susceptible to replay attacks, since each block gets decrypted in exactly the same way?

Which of the following layers of the OSI model corresponds to the Host-to-Host layer of the TCP/IP
model?

You are the Network Administrator for a college. You watch a large number of people (some not
even students) going in and out of areas with campus computers (libraries, computer labs, etc.). You
have had a problem with laptops being stolen. What is the most cost effective method to prevent
this?

The ATM of a bank is robbed by breaking the ATM machine. Which of the following physical security
devices can now be used for verification and historical analysis of the ATM robbery?

You have been assigned the task of selecting a hash algorithm. The algorithm will be specifically
used to ensure the integrity of certain sensitive files. It must use a 128 bit hash value. Which of the
following should you use?

Which of the following are the countermeasures against a man-in-the-middle attack? Each correct
answer represents a complete solution. Choose all that apply.

Which of the following protocols is designed to efficiently handle high-speed data over wide area
networks (WANs)?