Comp sci

Which of the following best describes a challenge involved in using a parallel computing solution?

A parallel computing solution may not be appropriate for an algorithm that can be easily broken down into small independent tasks.

Which of the following best exemplifies the use of keylogging to gain unauthorized access to a computer system?

A user receives an e-mail that claims to be from the user's bank. The e-mail instructs the user to click on a link to a Web site and enter a username and password to verify an account. Shortly after following the steps, the user discovers that the Web site is fraudulent and that the user's username and password were stolen.

Individuals sometimes attempt to remove personal information from the Internet. Which of the following is the LEAST likely reason the personal information is hard to remove?

All personal information is stored online using authentication measures, making the information hard to access.

A group of students take hundreds of digital photos for a science project about weather patterns. Each photo file contains data representing the level of red, green, and blue for each pixel in the photo. The file also contains metadata that describes the date, time, and geographic location where the photo was taken. For which of the following goals would analyzing the metadata be more appropriate than analyzing the data?

Determining the chronological order of the photos. Determining whether two photos were taken at the same location on different days

A local router is configured to limit the bandwidth of guest users connecting to the Internet. Which of the following best explains the result of this configuration as compared to a configuration in which the router does not limit the bandwidth?

Guest users will be restricted in the maximum amount of data that they can send and receive per second.

Which of the following is a true statement about the use of public key encryption in transmitting messages?

Public key encryption is not considered a secure method of communication because a public key can be intercepted.

Which of the following best describes a direct benefit in using redundant routing on the Internet?

Redundancy often allows messages to be sent on the network even if some network devices or connections have failed.

A state government is attempting to reduce the digital divide. Which of the following activities has the greatest potential to contribute to the digital divide rather than reducing it?

Requiring applicants for government jobs to apply using an online platform

Which of the following statements about the Internet is true?

The Internet is designed to scale to support an increasing number of users.

A program developed for a Web store represents customer account balances using a format that approximates real numbers. While testing the program, a software developer discovers that some values appear to be mathematically imprecise. Which of the following is the most likely cause of the imprecision?

The account balances are represented using a fixed number of bits, resulting in overflow errors.

RunRoutr is a fitness tracking application for smartphones that creates suggested running routes so that users can run with each other. Upon downloading the application, each user creates a username, a personal profile, and a contact list of friends who also use the application. The application uses the smartphone's GPS unit to track a user's location, running speed, and distance traveled. Users can use the application to review information and statistics about their previous runs. At the beginning of a run, users indicate the distance they want to run from their current location, and the application suggests a running route. Once a user accepts a suggested route, the application shares the suggested route with other compatible users in the area so that they can run together. Users are considered compatible if they are on each other's contact lists or if they typically run at similar speeds. A basic RunRoutr account is free, but it displays advertisements that are targeted to individual users based on data collected by the application. For example, if a user's running route begins or ends near a particular store, the application may display an advertisement for that store. Users have the ability to pay a monthly fee for a premium account, which removes advertisements from the application. Adrianna uses RunRoutr to suggest a running route. All compatible users near Adrianna receive a notification that shows her running route. Which of the following data is not obtained using data collected from Adrianna's smartphone but necessary for RunRoutr to share Adrianna's running route?

The current locations of other RunRoutr users

A video-streaming Web site keeps count of the number of times each video has been played since it was first added to the site. The count is updated each time a video is played and is displayed next to each video to show its popularity. At one time, the count for the most popular video was about two million. Sometime later, the same video displayed a seven-digit negative number as its count, while the counts for the other videos displayed correctly. Which of the following is the most likely explanation for the error?

The mathematical operations used to calculate the count caused a rounding error to occur.

A binary number is to be transformed by appending three 0s to the end of the number. For example, 11101 is transformed to 11101000. Which of the following correctly describes the relationship between the transformed number and the original number?

The transformed number is 8 times the value of the original number.

Which of the following best explains the ability to solve problems algorithmically?

There exist some problems that cannot be solved algorithmically using any computer.

Which of the following research proposals is most likely to be successful as a citizen science project?

Using a simulation to determine which one from a set of chemicals causes the most significant change to local animal and plant life