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 happens to data at layer 4 (Transport)?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Data
Layer 2
Frames


2. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
Source and Destination 'MAC addresses'
Segment
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


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 1(Physical)?
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
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
Converts the frames into bits for transmission across the transmission media
Frames


5. What is a PDU (Protocol Data Unit)?
Data
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 start in the upper layers and works is way down?
Layer 2


6. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Source and Destination 'MAC addresses'
Frames
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Data


7. In general What are the responsibility of the upper layers?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the 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
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.
Prepare the data to be sent through the network


8. What is the layer 4 (Transport) control information that is added to the Header?
Data
Source and Destination MAC address
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. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
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
Frames


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

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11. What gets added to the service data unit at the Network layer?
Source and Destination IP address
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
Segments


12. What is the short description of the encapsulation process?
Source and Destination 'IP addresses'
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Converts the frames into bits for transmission across the transmission media
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'


13. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
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.
Data
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
Segments


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

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15. What is a MPDU (MAC Protocol Data Unit)?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination IP address
Source and Destination MAC address


16. What is a SDU (Service Data Unit)?
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
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.
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'


17. Where does the process of data encapsulation start?
Layer 2
Decapsulation
Source and Destination 'MAC addresses'
It start in the upper layers and works is way down?


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


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

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20. What is data called after a Header is added?
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 address
Segment
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.


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


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

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23. Which OSI model layer uses service data units called frames?
Segments
Packet
Layer 2
Source and Destination MAC address


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

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