Instructions:

• Answer 24 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. In general What are the responsibility of the upper layers?
Prepare the data to be sent through the network
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Segments
Source and Destination 'MAC addresses'


2. What is the layer 3 (Network) control information that is added to the Header?

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3. What happens to the PDU at layer 2(Data Link)?

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4. What is a MPDU (MAC Protocol Data Unit)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination MAC address
Source and Destination IP address
Source and Destination 'MAC addresses'


5. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
In a layered system - a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data of that layer
Segments
It is a unit of data that has been passed down from an OSI layer to a lower layer and that has not yet been encapsulated into a protocol data unit (PDU) by the lower layer.


6. What is a SDU (Service Data Unit)?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Segment
Source and Destination 'IP addresses'
It is a unit of data that has been passed down from an OSI layer to a lower layer and that has not yet been encapsulated into a protocol data unit (PDU) by the lower layer.


7. What gets added to the service data unit at the Network layer?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Source & Destination Ports
4.The Layer 4 (Transport Layer) PDU is the segment for TCP connections or datagram for UDP connections 'Segment' 3.The Layer 3 (Network Layer) PDU is the 'Packet' 2.The Layer 2 (Data Link Layer) PDU is the 'Frame' 1.The Layer 1 (Physical Layer) PDU i
Source and Destination IP address


8. What is the process called at the receiving Host?
Decapsulation
Source and Destination MAC address
Source and Destination 'MAC addresses'
Segments


9. In an OSI context what happens to a PDU that is being recieved?

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10. What is the short description of the encapsulation process?
Data
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination MAC address


11. What happens to the PDU at layer 1(Physical)?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Source and Destination 'IP addresses'
Packet
Converts the frames into bits for transmission across the transmission media


12. What happens to data at layer 4 (Transport)?
Packet
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation


13. What happens to the PDU at layer 3 (Network)?

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14. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
In a layered system - a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data of that layer
Source and Destination IP address
Decapsulation
Data


15. Where does the process of data encapsulation start?
Packet
Source and Destination MAC address
Segments
It start in the upper layers and works is way down?


16. What is the layer 2 (Data Link) control information that is added to the Header?

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17. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Layer 2
Frames
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
4.The Layer 4 (Transport Layer) PDU is the segment for TCP connections or datagram for UDP connections 'Segment' 3.The Layer 3 (Network Layer) PDU is the 'Packet' 2.The Layer 2 (Data Link Layer) PDU is the 'Frame' 1.The Layer 1 (Physical Layer) PDU i


18. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Layer 2
In a layered system - a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data of that layer


19. In an OSI context what happens to a PDU that is being Transmitted?

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20. What is data called after a Header is added?
Segment
Source & Destination Ports
Packet
4.The Layer 4 (Transport Layer) PDU is the segment for TCP connections or datagram for UDP connections 'Segment' 3.The Layer 3 (Network Layer) PDU is the 'Packet' 2.The Layer 2 (Data Link Layer) PDU is the 'Frame' 1.The Layer 1 (Physical Layer) PDU i


21. What gets added to the service data unit at the Data Link layer?
Source and Destination 'IP addresses'
Source and Destination MAC address
Frames
Data


22. What is the layer 4 (Transport) control information that is added to the Header?
Source and Destination MAC address
In a layered system - a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data of that layer
It is a unit of data that has been passed down from an OSI layer to a lower layer and that has not yet been encapsulated into a protocol data unit (PDU) by the lower layer.
Source & Destination Ports


23. What is a PDU (Protocol Data Unit)?
Segments
It start in the upper layers and works is way down?
Prepare the data to be sent through the network
In a layered system - a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data of that layer


24. Which OSI model layer uses service data units called frames?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Layer 2
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'