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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 gets added to the service data unit at the Network layer?
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.
Layer 2
Converts the frames into bits for transmission across the transmission media
Source and Destination IP address

2. What gets added to the service data unit at the Data Link layer?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Segment
It start in the upper layers and works is way down?
Source and Destination MAC address

3. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
Data
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
Layer 2

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

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

6. 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.
Packet
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'

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

8. 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
Source and Destination MAC address
It start in the upper layers and works is way down?

9. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Segments
Source and Destination 'IP addresses'

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

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

12. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Decapsulation
It start in the upper layers and works is way down?
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.

13. What is the layer 4 (Transport) control information that is added to the Header?
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 & Destination Ports
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'

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

15. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Prepare the data to be sent through the network
Data
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

16. 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
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
Segments

17. What is data called after a Header is added?
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
Segments
Segment

18. What is the process called at the receiving Host?
Frames
Decapsulation
Source and Destination 'MAC addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

19. Which OSI model layer uses service data units called frames?
Layer 2
Segments
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Source & Destination Ports

20. What is a MPDU (MAC Protocol Data Unit)?
Data
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'
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 happens to the PDU at layer 3 (Network)?

22. In general What are the responsibility of the upper layers?
Converts the frames into bits for transmission across the transmission media
Source and Destination 'IP addresses'
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.

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

24. What happens to the PDU at layer 1(Physical)?
Source & Destination Ports
Converts the frames into bits for transmission across the transmission media
Frames
Layer 2