Vocab (week 2)

Question 1

What is a Modem?

Answer 1

Converts the signal used for transmission to a signal that can be used by your computer and vice versa.
Modem stands for modulator/demodulator

Question 2

types of modem?

Answer 2

• tv cable
• phone modem
• cellular (mobile hotspots)
• sattellite
• power line

Question 3

Routers

Answer 3

a router shares your internet connection among multiple devices

Question 4

Types of routers

Answer 4

Wire - LAN
Wireless - Wifi AND LAN outputs

Question 5

How do we use routers?

Answer 5

• Connect router to modem. It will then share modems internet connection with the devices that connect to it.

Question 6

Input and output of routers

Answer 6

• input - ethernet cable from modem (the port is called WAN)
• Output - ethernet cables (ports are called LAN)
  
  • wifi signals (opitonal)

Question 7

Mobile hotspots:

Answer 7

• devices that convert cellular signals to wifi signals
• some of them also provide ethernet outputs
• usually buy from mobile providers

Question 8

The gigabit war

Answer 8

Companies are now using fiber optics and creaing their own fiber optic internet providers

Question 9

What is needed in ur computer:

Answer 9

• network card:
• computer may have several network cards: wireless, ethernet, dial-up

Question 10

clients:

Answer 10

requests and receives information

Question 11

• servers:

Answer 11

provides services to clients,i .e receives request, processes it and returns the information to clients

Question 12

Takeaway:

Answer 12

a server is a ROLE not a piece of equipment

Question 13

Downloading:
Uploading:
Bandwidth:

Answer 13

receiving data from a server
sending data to a server
is the speed of data transmission

Question 14

• HTML

Answer 14

Browser is a program to translate HTML into pretty webpages
- HTML (hypertext Markup language) is a langauge for creating web pages

Question 15

Cache

Answer 15

• in general, cache is a hardware or software component that stores data so future requests for that data can be served FASTEr
• In case of browsing: cache is the memory used to store recenrly downloaded data to avoid downloading again, faster service and less data usage.

Question 16

cache cons:

Answer 16

• reveal pages you have visited
• delay new page updates from being displayed (cant see most recent version of the page)
• takes up disk space

Question 17

Browsing vs cache

Answer 17

Browsing :

• browsing history: addresses daved easily so you can select a page recently viewed
• Different than cache: stores addressed not COntent
• You can also clear your internet hisotry thorugh the borwser options

Question 18

URL has 3 parts

Answer 18

Protocol, domain, resource path

Question 19

DNS:

Answer 19

Domain names are easier to REMEMBER than IP addresses

• but the internet is based on IP addresses
• Each time you type a domain name in a URL - your computer has to first find that IP address od that domain name
• it asks special computers on the internet that are called domain name servers

Question 20

PACKETS:

Answer 20

• Data is usually not sent as a continouts stream, split into smaller chunks
• smaller chunks are then places in digital envelopes called packets

Question 21

Security vs Privacy

Answer 21

Privacy and security are related but are not the same thing.

• privacy related to any Rights you have to CONTROl your personal information and how its used
• think about - privacy policies

PRIVACY = YOUR RIGHTS

Security refers to how your personal information is PROTECTED

• your data different details about you may live in a lot of places
• that can challenge both your privacy and security