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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. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Source and Destination IP address
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Segments
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'

2. Which OSI model layer uses service data units called frames?
Layer 2
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
Converts the frames into bits for transmission across the transmission media

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

4. 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
Source and Destination IP address
It start in the upper layers and works is way down?

5. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
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
Prepare the data to be sent through the network
Data
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

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

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

8. What is a SDU (Service Data Unit)?
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 and Destination MAC address
Layer 2

9. What is a MPDU (MAC Protocol Data Unit)?
Source and Destination 'MAC addresses'
Source and Destination IP address
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination 'IP addresses'

10. What is the short description of the encapsulation process?
Source and Destination IP address
Decapsulation
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
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

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

12. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Frames
Converts the frames into bits for transmission across the transmission media
It start in the upper layers and works is way down?

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

14. What is the layer 4 (Transport) control information that is added to the Header?
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.
Packet
Source & Destination Ports

15. What happens to the PDU at layer 1(Physical)?
Source and Destination IP address
Converts the frames into bits for transmission across the transmission media
Layer 2
Source and Destination MAC address

16. What is a PDU (Protocol Data Unit)?
Decapsulation
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
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

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

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

19. What is the process called at the receiving Host?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
Frames
It start in the upper layers and works is way down?

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

21. In general What are the responsibility of the upper layers?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Prepare the data to be sent through the network
Source and Destination 'MAC addresses'
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'

22. What is data called after a Header is added?
Source and Destination 'IP addresses'
Segments
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Segment

23. What happens to data at layer 4 (Transport)?
Decapsulation
Source & Destination Ports
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

24. What gets added to the service data unit at the Network layer?
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
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Source and Destination IP address