Cisco Certification Data Encapsulation

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. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Source and Destination 'MAC addresses'
Source and Destination 'IP addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Frames


2. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Packet
Segment
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


3. Which OSI model layer uses service data units called frames?
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.
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
Layer 2


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

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5. What gets added to the service data unit at the Data Link layer?
Source and Destination IP address
Source and Destination MAC address
Decapsulation
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'


6. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
It start in the upper layers and works is way down?
Data
Converts the frames into bits for transmission across the transmission media
Decapsulation


7. What is a PDU (Protocol Data Unit)?
It start in the upper layers and works is way down?
Packet
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
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


8. What is a SDU (Service Data Unit)?
Segments
Converts the frames into bits for transmission across the transmission media
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 and Destination 'IP addresses'


9. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
1.The Layer 1 (Physical Layer) PDU is the bit or - more generally - symbol (can also been seen as 'stream') 2.The Layer 2 (Data Link Layer) PDU is the 'Frame' 3.The Layer 3 (Network Layer) PDU is the 'Packet' 4.The Layer 4 (Transport Layer) PDU is th
Source and Destination MAC address
Segments
Frames


10. What gets added to the service data unit at the Network layer?
It start in the upper layers and works is way down?
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 and Destination IP 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


11. What is data called after a Header is added?
Segments
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Segment


12. Where does the process of data encapsulation start?
Prepare the data to be sent through the network
Converts the frames into bits for transmission across the transmission media
It start in the upper layers and works is way down?
Source & Destination Ports


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

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

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15. What is the short description of the encapsulation process?
Prepare the data to be sent through the network
Source & Destination Ports
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


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

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17. What happens to the PDU at layer 1(Physical)?
Packet
Converts the frames into bits for transmission across the transmission media
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Source & Destination Ports


18. What is a MPDU (MAC Protocol Data Unit)?
Source & Destination Ports
Source and Destination MAC address
Layer 2
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.


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

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20. In general What are the responsibility of the upper layers?
Source and Destination IP address
Decapsulation
Prepare the data to be sent through the network
Data


21. What is the process called at the receiving Host?
Segment
It start in the upper layers and works is way down?
Decapsulation
Source and Destination MAC address


22. What is the layer 4 (Transport) control information that is added to the Header?
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
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
Source & Destination Ports


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

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24. What happens to data at layer 4 (Transport)?
Source and Destination 'IP addresses'
It start in the upper layers and works is way down?
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
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information