Connectivity

Question 1

State 3 benefits of having a home network

Answer 1

Sharing the Internet connection.
Sharing files, including backing up files.
Sharing peripherals, eg. Printers.

Question 2

What do you need in order to connect computers to a network

Answer 2

A network interface card (NIC)

Question 3

What are routers

Answer 3

Connecting to the Internet from a home network requires a router. The router connects all of the computers to the modem by giving them an internal IP address so that it knows where to send the data.

Question 4

Name two types of network

Answer 4

Cable connection to router using Ethernet cable.

Wireless connection to router using radio waves.

Question 5

What are 3 advantages and 3 disadvantages of using a cable connection to a router.

Answer 5

• cables have to run from router to all rooms in house.
• installation is expensive.
• you cannot connect in a room without a socket.
  + very fast bandwidth.
  + good security
  + should not experience interference.

Question 6

What are 3 advantages and 3 disadvantages of using a wireless connection to a router

Answer 6

• slower bandwidth
• poor security, unless it has a security password.
• interference can be affected by obstacles.
  + all you need is a wireless router to set it up
  + it’s cheap as you only have to buy the router.
  + you can access the network from anywhere in the house.

Question 7

How does a power line network work

Answer 7

It uses existing power wiring as a framework to carry data.

Question 8

What is a local area network (LAN)

Answer 8

To create a home network you set up a LAN. This connects all the computers in the house so that resources can be shared.

Question 9

Name 3 ways of securing wireless networks

Answer 9

Changing the default admin password on the router.
Setting up a form of encryption.
Turning off the router when it is not in use.

Question 10

What does an encryption do

Answer 10

An encryption scrambles data so that only computers with the right key can read it.

Question 11

Jill wears a headset when driving so that she can make calls hands free. State two wireless communication networks that allow her to do this.

Answer 11

Bluetooth

3G

Question 12

Jack is in an area where there is no wifi signal. Describe how jack could upload the images from his netbook.

Answer 12

If he sets his phone as a portable wifi hotspot the netbook can join this network and use the 3G network to access the Internet and upload images.

Question 13

What is bandwidth

Answer 13

The number of bits that can go through the network connection in 1 second.

Question 14

What is latency

Answer 14

The time in milliseconds between a bit leaving one device and arriving at the other.

Question 15

For streaming videos what so you need and why

Answer 15

A high bandwidth otherwise the video will keep pausing as your computer waits for more bugs to arrive.

Question 16

To get a quick search result from Google what do you need

Answer 16

A low latency network connection. Information is traveling in both directions so it needs to arrive quickly.

Question 17

Jeff wants to watch bbc Iplayer in HD on his computer. Explain why a high bandwidth of jeffs internet connection is important.

Answer 17

Bandwidth is the number of bits that can go through a network in 1 sec. To stream a HD video Jeff will need a high bandwidth otherwise the video will keep pausing to wait for more bits to arrive.

Question 18

What are 3 benefits and 2 drawbacks of using wifi

Answer 18

+ good range
+ speeds of up to 50mbps
+ quite widely available.
- hackers sometimes set up fake wifi hotspots putting users details at risk.
- cannot use of not in range of an access point.

Question 19

What are 2 benefits and 3 drawbacks of using mobile broadband, eg. 3G

Answer 19

+ far greater coverage than wifi
+ more secure than wifi as data is encrypted.
- have to pay for mobile broadband, Including roaming charges when abroad.
- downloads are limited
- lower bandwidth than wifi.

Question 20

What is a peer to peer network

Answer 20

When digital devices communicate wirelessly with each other directly without the need for a transmitter between them.

Question 21

How do peer to peer networks work

Answer 21

By wifi direct

By Bluetooth

Question 22

What are the advantages to using wifi direct

Answer 22

Allows users to set up peer to peer networks.

Allows the devices to use an access point for normal wifi use.

Question 23

What are the advantages to using Bluetooth for peer to peer networks

Answer 23

Allows devices to communicate automatically when within range - with no user involvement.
Can connect up to eight devices at the same time.

Question 24

Compare Bluetooth and wifi direct’s bandwidth and range for peer to peer networks

Answer 24

Bluetooth has faster bandwidth.

Wifi direct has better range.

Question 25

Give two reasons to why Bluetooth is not used to network devices in a large office

Answer 25

Bluetooth has a lower range so the devices being networked need to be close together, which would not be the case in a large office. It has a low bandwidth and so data is transfer would be slow.

Question 26

Explain why Bluetooth rather than traditional wifi is used for communication between a mobile phone and a headset for hands-free phone calls.

Answer 26

Using Bluetooth, the two devices can communicate directly without the need for a transmitter. They can also communicate automatically without the need for any user actions.

Question 27

What is VoIP

Answer 27

Voice over Internet protocol is the set of rules for transmitting audio messages over the Internet. It enables you to make free voice called from your computer.

Question 28

What is SMTP

Answer 28

Simple mail transfer protocol is used when email is sent from the senders email client to the senders email server and when the email is delivered to the recipients server.

Question 29

What happens if POP is used to read an email sent via SMTP

Answer 29

The mail server will download the emails to the computer. The email is then deleted from the server and can be read offline.

Question 30

What happens if IMAP is used to read an email sent via SMTP

Answer 30

The email is read on the mail server. The email is not deleted from the server and can be accessed anywhere using any computer with an Internet connection.

Question 31

Johns email account uses the POP protocol. Describe how the POP protocol is different from IMAP when retrieving an email

Answer 31

The mail server downloads the email to johns computer and felted then from the server. With IMAP John would read the emails on the server. They would not be deleted and he could access and read them from any computer.

Question 32

What is the difference between http and https

Answer 32

Http is used to surf the web | HTTPS is used to send confidential information.

Question 33

What is http

Answer 33

The protocol of the World Wide Web

Question 34

Why is https used to Send confidential info over the Internet

Answer 34

It uses data that is encrypted so that it cannot be read by anyone except the recipient

Question 35

How does https work

Answer 35

Browser checks the sites certificate. Web server and your browser determine the encryption types that they can both use to understand each other. Your browser and web server send each other unique codes to use when encrypting the info being sent. Your browser and the web server start talking to each other using the encryption.

Question 36

What is a firewall

Answer 36

A firewall is software that permits or blocks connections between your computer and other computers on the newer work according to the rules you have set

Question 37

What is a virus

Answer 37

A program designed to cause other computer programs to malfunction or stop working. Virus's can replicate themselves and can be passed on to other users using files and emails.

Question 38

Name 3 additional precautions you should take against viruses

Answer 38

Install antivirus software and keep it updated. Run regular scans if files on the computer. Only download from trusted websites

Question 39

How can you prevent theft of your equipment.

Answer 39

Chains and locks can be used to fix a computer/laptop to a desk.

Question 40

For companies who have many computers how can you keep people from stealing them

Answer 40

Fit doors with security keypads and keep them locked. Install burglar alarms. Require all people entering the building to authenticate their identity.