Exam 1

Question 1

A digital device is a computer if it has:

Answer 1

• Input - keyboard, mouse, touch screen, camera, scanner, microphone
  
  • Storage - RAM (Random access memory - operating memory), ROM (Read only memory - for running instructions), USB
  • Processing - CPU (Central Processing Unit - the brains of the computer)
  • Output - monitor, printers, headphone/speakers
    ** Cables transfer data - HDMI/Ethernet

Question 2

What can Binary represent ?

Answer 2

• Binary can represent numbers, text, pixels (images), audio graphs (sound).
  (Binary for text is also known as ASCII.)

Question 3

What is binary

Answer 3

binary isnthe “language” that computers speak in “speak” in binary - 0s and 1s - which are electrical pulses.

Question 4

What can be compressed/simplified by removing excess information?

Answer 4

Files
Files can be compressed to make them smaller - removes excess information using a code and puts it in a dictionary to reference later.

Question 5

What does Lossy mean?

Answer 5

Lossy - the removed information is “thrown away”

Question 6

• What does lossless mean?

Answer 6

Losless- the removed information is able to be decompressed back into the file when required.

Question 7

What is Ethernet connection?

Answer 7

It is a Wired connection

Very short range, local and cheap

Question 8

What is a Radio connection?

Answer 8

It is Wireless &

Medium range and moderately expensive

Question 9

What is a fibre Fibre Optic connectcion?

Answer 9

It is Wired&

Long range, super-fast, very expensive

Question 10

What are Networks are made up of ?

Answer 10

connections that transfer data through wired or wireless.

Question 11

What is the Internet?

Answer 11

The internet is a system of data transfer through networks between computers around the world.

Question 12

What is divided in to packets ?

Answer 12

Messages are broken into packets that are “addressed” with Packet Metadata (Data added to packets to help route them through the network and reassemble the original message) including the IP Address (The unique number assigned to each device on the Internet).

Question 13

Packets are sent over _________

Answer 13

Roter
These packets are sent out over the Router (a type of computer that forwards data across a network).

Question 14

What is internet protocol (IP)

Answer 14

nternet Protocol (IP): a protocol for sending data across the Internet that assigns unique numbers (IP addresses) to each connected device

Question 15

What is Transmission Control Protocol (TCP)

Answer 15

Transmission Control Protocol (TCP): A protocol for sending packets that does error-checking to ensure all packets are received and properly ordered

Question 16

What is the Domain Name System (DNS) system responsible for ?

Answer 16

The Domain Name System (DNS): the system responsible for translating domain names like example.com into IP addresses
The DNS is an important system in helping the Internet scale.

Question 17

Do Work on OneNote !!!!!