Code.org Unit 2

A computing device is ...

• a sequence of direct connections

• a machine that can run a program

• a group of computers working together for a common purpose

• a group of connected computers that can send or receive data

A computing system is...

• a sequence of direct connections

• a machine that can run a program

• a group of computers working together for a common purpose

• a group of connected computers that can send or receive data

A computing network is...

• a sequence of direct connections

• a machine that can run a program

• a group of computers working together for a common purpose

• a group of connected computers that can send or receive data

A path is...

• a sequence of direct connections

• a machine that can run a program

• a group of computers working together for a common purpose

• a group of connected computers that can send or receive data

Which of the following best describes the protocols used on the Internet?

• The protocols of the Internet are designed by government agencies to ensure they remain free to use

• The protocols of the Internet are secret to maintain the privacy and security of people using them

• Each device connected to the Internet will use a protocol designed by the company that manufactured it

• The protocols of the Internet are open and used by all devices connected to the network

You purchase a new smartphone and use it to send a photo over the internet to a friend in another country. Which is NOT necessary for this to happen?

• Both devices are using the same shared and open protocols

• A single direct connection is established between the two devices through an internet connection

• The data of the image is routed through a sequence of directly connected devices before arriving at its destination.

• Both devices are directly connected to at least one part of the Internet

How has the Internet responded to the increasing number of devices now using the network?

• The Internet protocols are changed every year to adapt to the new devices that have been connected to the network

• While the number of devices connected to the Internet has grown, the network itself has not grown

• The protocols of the Internet were designed to scale as new devices are added

• The protocols of the Internet are no longer necessary thanks to the large number of devices now connected to the network

Which of the following is true of how packets are sent through the Internet?

• Packet metadata is only on important packets because they should travel faster on the internet than other packets.

• Packet metadata is used to route and reassemble information travelling through the Internet

• Information sent through the internet is only transmitted in packets if the message is too large to be sent as a datastream

• Information sent through the internet is split into two packets: one with the message and another with the metadata

You are watching a video that is being sent to your laptop by a server over the Internet which splits the video into packets and sends them in the order they appear in the video. Which of the following is true about how the packets will arrive at your computer?

• The packets will always be received in the order that they were sent

• Either every packet will reach her computer or none of them will.

• Packets that arrive out of order will be sent back to the server.

• The packets may arrive out of order

Which of the following best describes the purpose of an IP address?

• An IP address is a unique number that identifies devices as they send and receive information on the Internet

• IP addresses reconstruct the packets of a message

• IP addresses indicate the location where an internet-connected computing device was manufactured

• IP addresses indicate how many times an individual packet has been requested by a router