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 the PDU at layer 3 (Network)?

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2. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
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
Segment
Converts the frames into bits for transmission across the transmission media


3. 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
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
Converts the frames into bits for transmission across the transmission media


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

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5. Which OSI model layer uses service data units called frames?
Layer 2
Source and Destination MAC address
Source and Destination 'IP addresses'
Segment


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

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7. What happens to the PDU at layer 1(Physical)?
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.
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Converts the frames into bits for transmission across the transmission media


8. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
It start in the upper layers and works is way down?
Segments
Data
Segment


9. What is the layer 4 (Transport) control information that is added to the Header?
Source & Destination Ports
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
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.


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

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11. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Frames
It start in the upper layers and works is way down?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'


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

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


14. What gets added to the service data unit at the Network layer?
Frames
Source and Destination IP address
Source and Destination MAC address
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


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


16. What is the short description of the encapsulation process?
Prepare the data to be sent through the network
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 'IP addresses'
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'


17. What is a MPDU (MAC Protocol Data Unit)?
Frames
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Packet
Decapsulation


18. What is a SDU (Service Data Unit)?
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
Source and Destination 'IP addresses'
Source and Destination 'MAC addresses'


19. Where does the process of data encapsulation start?
Decapsulation
Prepare the data to be sent through the network
It start in the upper layers and works is way down?
Source and Destination 'MAC addresses'


20. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Packet
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


21. What is data called after a Header is added?
Converts the frames into bits for transmission across the transmission media
Segment
Source and Destination MAC address
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information


22. What is the process called at the receiving Host?
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 IP address
Layer 2
Decapsulation


23. What is a PDU (Protocol Data Unit)?
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
Source & Destination Ports
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. What is the layer 3 (Network) control information that is added to the Header?

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