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Cisco Certification Data Encapsulation

Instructions:

Answer 24 questions in 15 minutes.
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Match each statement with the correct term.
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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?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Prepare the data to be sent through the network
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

2. What gets added to the service data unit at the Data Link layer?
Source and Destination MAC address
Source and Destination 'MAC addresses'
Data
It start in the upper layers and works is way down?

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

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

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

6. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Segment
It start in the upper layers and works is way down?

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

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

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

10. What happens to data at layer 4 (Transport)?
It start in the upper layers and works is way down?
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
Source and Destination MAC address

11. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
Segment
Source and Destination 'IP addresses'
Source and Destination IP address

12. Which OSI model layer uses service data units called frames?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Layer 2
Converts the frames into bits for transmission across the transmission media
Packet

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

14. What is a SDU (Service Data Unit)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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.
Decapsulation
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'

15. What is the short description of the encapsulation process?
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
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.
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

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

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

18. What is a MPDU (MAC Protocol Data Unit)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Data
Prepare the data to be sent through the network
Segments

19. In general What are the responsibility of the upper layers?
Layer 2
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
Prepare the data to be sent through the network
Source and Destination MAC address

20. What is the process called at the receiving Host?
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
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'
Converts the frames into bits for transmission across the transmission media

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

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

23. What is data called after a Header is added?
Packet
Segment
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'

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