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. Where does the process of data encapsulation start?
It start in the upper layers and works is way down?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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


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


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

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

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5. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (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
Packet
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


6. What is the short description of the encapsulation process?
It start in the upper layers and works is way down?
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
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Source and Destination MAC address


7. What gets added to the service data unit at the Network layer?
Source and Destination 'IP addresses'
Prepare the data to be sent through the network
Source and Destination IP address
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.


8. What is the process called at the receiving Host?
Decapsulation
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source & Destination Ports
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


9. Which OSI model layer uses service data units called frames?
Layer 2
Source & Destination Ports
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
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


10. 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
Source and Destination 'IP addresses'
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 & Destination Ports


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

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12. What is data called after a Header is added?
Packet
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Segment
Source and Destination IP address


13. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Source and Destination 'MAC addresses'
Converts the frames into bits for transmission across the transmission media
Data
Decapsulation


14. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Prepare the data to be sent through the network
Layer 2
Converts the frames into bits for transmission across the transmission media
Segments


15. In general What are the responsibility of the upper layers?
Segment
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
Prepare the data to be sent through the network


16. What happens to data at layer 4 (Transport)?
Layer 2
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
Prepare the data to be sent through the network


17. What gets added to the service data unit at the Data Link layer?
Segments
Source and Destination MAC address
Source and Destination 'IP addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information


18. What happens to the PDU at layer 1(Physical)?
Source and Destination 'MAC addresses'
Segment
Source & Destination Ports
Converts the frames into bits for transmission across the transmission media


19. What is a SDU (Service Data Unit)?
Source and Destination IP address
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.


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

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21. What is a PDU (Protocol Data Unit)?
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
Segments
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


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

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


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

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