Which of the following is not a main method for sending information from one computer to another?

Question 6 options:

Electricity


Light


Molecules


Radio

Question 7 (1 point)
Fiber optic cables transfer data at the speed of light, so they have the _______________ latency. This results in the __________ connection.

Question 7 options:

lowest, slowest


lowest, fastest


highest, slowest


highest, fastest

Question 8 (1 point)
Which of the following is considered an unethical use of computer resources?

Question 8 options:

Downloading file sharing software on your home computer


Searching online for the answers to CodeHS exercises and quizzes


Purchasing an app from an app store and downloading it directly to a mobile device


Searching online for an electronic version of a textbook

Question 9 (1 point)
What is the main purpose of the DNS system?

Question 9 options:

DNS translates the names of websites into IP addresses.


DNS increases the bandwidth of a network.


DNS ensures that websites are secure.


DNS increases connectivity by making the internet fault-tolerant.

Question 10 (1 point)
According to the domain name system (DNS), which of the following is a subdomain of the domain example.com?

Question 10 options:

about.example.com


example.com/about.html


example.com.about


example.org

Question 11 (1 point)
A user enters a Web address in a browser, and a request for a file is sent to a Web server. Which of the following best describes how the file is sent back to the user?

Question 11 options:

The file is broken into packets and sent over a network. The packets must be reassembled by the user's computer when they are received. If any packets are missing, the browser re-requests the missing packets.


The file is broken into packets and sent over a network. The user's browser must request each packet, in order, until all packets are received.


The server attempts to connect directly to the user's computer. If the connection is successful, the entire file is sent at once. If the connection is unsuccessful, an error message is sent to the user.


The server repeatedly attempts to connect directly to the user's computer until a connection is made. Once the connection is made, the entire file is sent.

Question 12 (1 point)
Which of the following is a benefit of the fault-tolerant nature of Internet routing?

Question 12 options:

The ability to use a hierarchical naming system to avoid naming conflicts


The ability to provide data transmission even when some connections between routers have failed


The ability to resolve errors in domain name system (DNS) lookups


The ability to use multiple protocols such as hypertext transfer protocol (HTTP), Internet protocol (IP), and simple mail transfer protocol (SMTP) to transfer data.

Question 13 (1 point)
Two computers are built by different manufacturers. One is running a Web server and the other is running a Web browser. Which of the following best describes whether these two computers can communicate with each other across the Internet?

Question 13 options:

The computers cannot communicate, because different manufacturers use different communication protocols.


The computers can communicate, but additional hardware is needed to convert data packets from one computer's protocol to the other computer's protocol.


The computers can communicate directly only if the messages consist of text. Other formats cannot be interpreted across computers.


The computers can communicate directly because Internet communication uses standard protocols that are used by all computers on the Internet.

Question 14 (1 point)
A city government is attempting to reduce the digital divide between groups with differing access to computing and the Internet.

Which of the following actions is LEAST likely to be effective in this purpose?

Question 14 options:

Holding basic computer classes at community centers


Providing free wireless Internet connections at locations in low-income neighborhoods


Putting helpful tips for operating computers on the city government website


Requiring that every school and library have assistive devices that allow people with disabilities to access computer resources

Question 15 (1 point)
An IPv4 address has 32 bits, so there are 232 (over 4 billion) possible IPv4 addresses. Since the Internet is gaining devices quickly, we will soon surpass 232 unique devices on the Internet.

In anticipation of all the new Internet devices, we are in the process of switching to IPv6, which uses 128 bits for a single address. That's 96 extra bits to represent one address!