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 Transmitted?

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

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3. What is a PDU (Protocol Data Unit)?
Source and Destination 'MAC addresses'
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.
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. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Packet
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
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
Segments


5. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Frames
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
Source and Destination IP address


6. 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
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Packet
Layer 2


7. Which OSI model layer uses service data units called frames?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Layer 2
It start in the upper layers and works is way down?
Decapsulation


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

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9. 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.
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Decapsulation
Segment


10. What is the layer 4 (Transport) control information that is added to the Header?
Source & Destination Ports
Segments
Data
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'


11. What happens to data at layer 4 (Transport)?
Frames
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
Decapsulation


12. What gets added to the service data unit at the Data Link layer?
Source and Destination 'MAC addresses'
Source and Destination MAC address
Converts the frames into bits for transmission across the transmission media
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'


13. What is a MPDU (MAC Protocol Data Unit)?
Layer 2
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits


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

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15. Where does the process of data encapsulation start?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Layer 2
Packet
It start in the upper layers and works is way down?


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

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

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18. What is the short description of the encapsulation process?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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'
Source and Destination IP address


19. What is data called after a Header is added?
Segments
Source and Destination MAC address
Segment
It start in the upper layers and works is way down?


20. What is the process called at the receiving Host?
Decapsulation
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
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.


21. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Frames
Source & Destination Ports
Data


22. What happens to the PDU at layer 1(Physical)?
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'
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


23. In general What are the responsibility of the upper layers?
Source and Destination MAC address
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
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
Prepare the data to be sent through the network


24. What gets added to the service data unit at the Network layer?
Source and Destination MAC 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.
Source and Destination 'MAC addresses'
Source and Destination IP address