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

2. What is a MPDU (MAC Protocol Data Unit)?
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
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.

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

4. Where does the process of data encapsulation start?
Packet
Data
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.
It start in the upper layers and works is way down?

5. What is a SDU (Service Data Unit)?
Source and Destination 'MAC addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
It start in the upper layers and works is way down?
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.

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

7. What happens to the PDU at layer 1(Physical)?
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
Converts the frames into bits for transmission across the transmission media
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

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

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

10. What is a PDU (Protocol Data Unit)?
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
Packet
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

11. When moving from top to bottom through the OSI model layers - which comes first - packets or 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.
Source and Destination 'MAC addresses'
Segments
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.

12. What happens to data at layer 4 (Transport)?
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
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

13. Which OSI model layer uses service data units called 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
Source and Destination MAC address
Layer 2

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

15. What is the short description of the encapsulation process?
Source & Destination Ports
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

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

17. What gets added to the service data unit at the Data Link layer?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
It start in the upper layers and works is way down?
Source and Destination MAC address

18. What is data called after a Header is added?
Segment
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
Source & Destination Ports

19. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (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.
Packet
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.

20. In general What are the responsibility of the upper layers?
Source and Destination MAC address
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Prepare the data to be sent through the 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

21. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Prepare the data to be sent through the network
It start in the upper layers and works is way down?
Layer 2
Frames

22. What is the layer 4 (Transport) control information that is added to the Header?
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 & 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'

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

24. What is the process called at the receiving Host?
Source & Destination Ports
Layer 2
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Decapsulation