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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. Which OSI model layer uses service data units called frames?
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
Source & Destination Ports
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'

3. What gets added to the service data unit at the Data Link layer?
Source & Destination Ports
Prepare the data to be sent through the network
Decapsulation
Source and Destination MAC address

4. What happens to data at layer 4 (Transport)?
Segment
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'
Segments

5. What is data called after a Header is added?
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 segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Source and Destination IP address
Segment

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

7. What happens to the PDU at layer 1(Physical)?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Converts the frames into bits for transmission across the transmission media
Prepare the data to be sent through the network
Segments

8. What is a PDU (Protocol Data Unit)?
Source and Destination 'IP addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
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 & Destination Ports

9. What is the layer 4 (Transport) control information that is added to the Header?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination MAC address
Data
Source & Destination Ports

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 MAC address
It start in the upper layers and works is way down?
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

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

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

13. What is a SDU (Service Data Unit)?
Prepare the data to be sent through the network
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
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

14. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Frames
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'

15. What is the process called at the receiving Host?
Frames
Converts the frames into bits for transmission across the transmission media
Source and Destination 'MAC addresses'
Decapsulation

16. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Decapsulation
It start in the upper layers and works is way down?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Packet

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

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

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.
Segments
Layer 2
Source and Destination IP address

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

21. In general What are the responsibility of the upper layers?
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
Data
Packet
Prepare the data to be sent through the network

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

23. What is the short description of the encapsulation process?
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
Segments
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

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