APCSP Unit 2: The Internet

What is the purpose of DNS?

• It assigns a unique address to every device on the Internet.
• It returns the IP address given the name of a website.
• It forwards a message from one machine to another.
• It has more bits so you can make a longer, unique address.

What is the purpose of a router?

• It assigns a unique address to every device on the Internet.
• It returns the IP address given the name of a website.
• It forwards a message from one machine to another.
• It has more bits so you can make a longer, unique address.

Why is IP v4 going to be replaced by IP v6?

• IP v6 is easier to use.
• IP v4 does not work on old hardware.
• IP v4 was not encrypted.
• We are running out of IP v4 addresses.

Transmission Control Protocol (TCP):

• Breaks messages into packets and addresses them

• A DNS attack in which numerous pings are made to the same IP, causing it to crash

• Protocol used by the World Wide Web. It describes how messages are formatted and interchanged, and how web servers respond to commands.

• Provides reliable, ordered, and error-checked delivery of a stream of packets on the internet

Internet Protocol:

• Breaks messages into packets and addresses them
• A DNS attack in which numerous pings are made to the same IP, causing it to crash
• Protocol used by the World Wide Web. It describes how messages are formatted and interchanged, and how web servers respond to commands.
• Provides reliable, ordered, and error-checked delivery of a stream of packets on the internet

Given the following network diagram, what is the minimum number of connections that must be broken or removed before computer E can no longer communicate with computer B?

• 1
• 2
• 3
• 4

Which of the following statements about packets is true? 

• Packets must be sent in order so they can be reassembled at the end host. 
• Packet switching results in a sustained, single connection between two hosts.
• All packets must pass through a centralized router to be verified.
• None of these statements are true. 

Which of the following best describes the basic idea of fault tolerance?

• A system that never fails
• If part of the system fails, the operation continues without interruption
• A program that does not allow inputs out of a range given by a programmer
• A program that does not allow loss of precision

A ____ HTTP request is used when the user requests information, but does not enter anything into the page.

• Get
• Post
• Send
• Fetch

Every computer has a unique IP address on the network

• True
• False