Computer Scince unit 4

• Computing Device


  Machine that can run a program
• Computer Network


  Group of computer that can send or receive data
• Computing System


  a group of computers working together for a common purpose
• Path


  Sequence of direct connects
• Which of the following best describes the protocols used on the Internet.


  Open and used by all devices connected to the internet
• How has the Internet responded to the increasing number of devices now using the network?


  the protocols of the internet to scale as new devices are added
• Packet of Metadata


  used to route and reassemble information travelling through the Internet.
• You are watching an online video. The video 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. How do the packets arrive at your computer? The packets...

  May arrive out of order
• Which of the following Internet protocols is MOST important in reassembling packets and requesting missing packets to form complete messages?

  TCP ( Transimition Control Protocol)
• Which of the following Internet protocols is used to request and send pages and files on the World Wide Web?

  HTTP
• Two devices are connected to the Internet and communicating with one another. A rat chews through one of the wires in the network that is currently being used by the devices to communicate. The network immediately begins using a different path through the network and communication continues as normal. This situation best exemplifies which principle?

  fault-tolerance
• Which of the following situations is most likely to cause issues arising from the digital divide?

  A state makes voter registration forms available only by visiting a government website
• Which of the following is NOT true of how computers represent complex information?

  Abstraction helps represent complex information by surfacing complexity that might otherwise be hidden.
• When visiting a museum you take a photo of a painting with a smartphone which stores the photo as an image file. Which of the following best describes the differences between the painting itself and the photo of the painting stored on the smartphone?


  the photo is a digital representation of the analog painting.
• Your computer uses 4 bits to represent decimal numbers (0, 1, 2, 3 and so on) in binary. What is the SMALLEST number for which an overflow error occur?

  16
• Which of the following is true of how computers represent numbers?

  With a fixed number of bits some numbers are too large to represent in a computer which will lead to overflow errors
• Convert the binary (base-2) number 1001 to decimal (base-10).

  9
• Convert the decimal (base-10) number 20 to binary (base-2).

  10100
• How many total numbers can be represented with an 8-bit binary (base-2) system?

  256
• Which of the following is true of lossy and lossless compression algorithms?

  Lossy compression algorithms are typically better than lossless compression algorithms at reducing the number of bits needed to represent a piece of data.
• You is sending a large image file to a friend as part of a shared classroom project. Which of the following is most likely true if you opt to compress the image before sending it?

  The image will require fewer bits in order to be represented.
• Which of the following is true of intellectual property?

  Creative Commons enables content creators to freely distribute their otherwise copyrighted work.
• Computing Network


  a group of connected computers that can send or receive data
• Which of the following best describes how computing devices represent information ?

  A computer represents data as bits which is either a 0 or a 1.
• Which of the following binary (base-2) numbers is LARGEST?

  111000000
• An internet service provider is company that builds the routers and wired connections that allow individuals to access the internet . An isp is considering adding additional access to the internet . Wich of the folloeing best describes why company would choose to do so


  Redundant are more reliable
• conevrt binary 20 to base-2

  10100
• IP address purpose


  provide a unique number for identyfing devices and receive information of the internet