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

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

3. What is the process called at the receiving Host?
Segment
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

4. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Source and Destination MAC address
Frames
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

5. What is a PDU (Protocol Data Unit)?
Source and Destination 'IP 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
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

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

7. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
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.
Prepare the data to be sent through the network
Source and Destination 'MAC addresses'

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

9. What is data called after a Header is added?
Segment
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 packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'

10. 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.
Source and Destination 'IP addresses'
Source and Destination 'MAC addresses'
Segment

11. Where does the process of data encapsulation start?
It start in the upper layers and works is way down?
Decapsulation
Source and Destination MAC address
Segment

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

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

14. What is the layer 4 (Transport) control information that is added to the Header?
Source and Destination MAC address
Decapsulation
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

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

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

17. What is the short description of the encapsulation process?
Segment
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 address

18. In general What are the responsibility of the upper layers?
Prepare the data to be sent through the network
Decapsulation
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

19. 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.
It start in the upper layers and works is way down?
Prepare the data to be sent through the network
Segments

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

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

22. What is a SDU (Service Data Unit)?
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
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.
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.

23. Which OSI model layer uses service data units called frames?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Frames
Layer 2

24. What gets added to the service data unit at the Data Link layer?
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
Converts the frames into bits for transmission across the transmission media
Source and Destination MAC address