2.1.3 Networks including the internet

Question 1

Network Interface Card (NIC)

Answer 1

• Assigns a mac address
• To uniquely identify device functioning on network.
• Allowing individual devices to connect to network.

Question 2

Wireless Access Points (WAP).

Answer 2

• Allows devices to connect to the LAN via radio communication.
• Wireless = no need for cables.
• Easier to move device to different location.

Question 3

Bridge

Answer 3

Connects multiple similar LANs together to form a larger LAN.

Question 4

Repeater

Answer 4

Duplicates signals transmitted by router to extend coverage of Wi-Fi.

Question 5

Router

Answer 5

• Connects two or more networks.
• Assigns private IP addresses.
• Recieves packages and forwards it to destination via shortest route using routing table.

Question 6

What is Ethernet?

Answer 6

Group of standards relating to how data is transferred via computer networks.

Question 7

Carrier Sense Multiple Access / Collision Detection (CSMA/CD)

Answer 7

• Instructs devices how to behave when packet collision occurs.
• If collision detected, CSMA/CD instructs each device to wait random time before resending.
• If bus still has traffic, CSMA/CD waits again, however if number of attempts reach limit, message is abandoned and error report generated.

Question 8

What is bit-streaming?

Answer 8

• Transfer of data at high-speed.
• Using sequence of bits.
• Sent over the internet.

Question 9

What is on-demand bit streaming?

Answer 9

• When a user access a website server hosting a stream.
• User recieves binary data representing multimedia file.
• User is able to watch the file while it is being recieved, packet by packet.

Question 10

What is real-time bit streaming?

Answer 10

• Used to transmit live video/audio
• Binary data is recorded via input device and transmitted to server.
• Server then sends live data to all requesting users.
• Cannot be paused.

Question 11

What is buffering?

Answer 11

• User needs high-broadband connection.

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