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

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2. What is the layer 4 (Transport) control information that is added to the Header?
Source and Destination 'MAC addresses'
Source & Destination Ports
Frames
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?
Source and Destination 'IP addresses'
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
Source and Destination 'MAC addresses'


4. 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
Data
Source and Destination 'MAC addresses'
Prepare the data to be sent through the network


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

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6. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Packet
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
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


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

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8. What gets added to the service data unit at the Data Link 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'
Prepare the data to be sent through the network
Source and Destination MAC address
Layer 2


9. What is a MPDU (MAC Protocol Data Unit)?
Source and Destination 'MAC addresses'
Frames
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Converts the frames into bits for transmission across the transmission media


10. What is a PDU (Protocol Data Unit)?
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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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 the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
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 & Destination Ports
Frames
Converts the frames into bits for transmission across the transmission media


12. What is the process called at the receiving Host?
Packet
Decapsulation
Source and Destination 'IP addresses'
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


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

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14. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
Frames
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Segments


15. What happens to data at layer 4 (Transport)?
Source and Destination MAC address
Converts the frames into bits for transmission across the transmission media
Decapsulation
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information


16. What is data called after a Header is added?
Source and Destination IP address
Segment
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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.


17. 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.
Segment
Packet
Source and Destination 'MAC addresses'


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

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19. What gets added to the service data unit at the Network layer?
Converts the frames into bits for transmission across the transmission media
Decapsulation
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


20. 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
Converts the frames into bits for transmission across the transmission media
It start in the upper layers and works is way down?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'


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

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22. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
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
Segments
Decapsulation


23. What is the short description of the encapsulation process?
Segments
Packet
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 address


24. Where does the process of data encapsulation start?
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'
Prepare the data to be sent through the network
It start in the upper layers and works is way down?