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

2. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
Frames
Converts the frames into bits for transmission across the transmission media
Decapsulation

3. What is data called after a Header is added?
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
It start in the upper layers and works is way down?
Segment

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

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

6. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
It start in the upper layers and works is way down?
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
Source and Destination 'IP addresses'

7. 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.
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
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

8. What is the process called at the receiving Host?
Source and Destination MAC address
Decapsulation
Prepare the data to be sent through the network
Segments

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

10. What happens to data at layer 4 (Transport)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Source and Destination 'MAC addresses'
Data

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

12. 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
Prepare the data to be sent through the network
Layer 2

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

14. What is the short description of the encapsulation process?
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
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

15. Where does the process of data encapsulation start?
Decapsulation
Segments
It start in the upper layers and works is way down?
Layer 2

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
Segments
Converts the frames into bits for transmission across the transmission media
Decapsulation

17. What happens to the PDU at layer 1(Physical)?
Decapsulation
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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

18. What gets added to the service data unit at the Network layer?
Source and Destination IP 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
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'

19. What is the layer 4 (Transport) control information that is added to the Header?
Source and Destination IP address
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
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

20. 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.
Converts the frames into bits for transmission across the transmission media
Layer 2
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'

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

22. What gets added to the service data unit at the Data Link 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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination MAC address
Segment

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

24. In general What are the responsibility of the upper layers?
Frames
Prepare the data to be sent through the network
Source and Destination 'MAC addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.