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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 3 (Network)?

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

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

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

5. What is the process called at the receiving Host?
It start in the upper layers and works is way down?
Decapsulation
Source and Destination IP address
Segments

6. What is a MPDU (MAC Protocol Data Unit)?
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
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'
Packet

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

8. What is the layer 4 (Transport) control information that is added to the Header?
Source and Destination 'IP addresses'
Source & Destination Ports
Packet
Layer 2

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

10. What is data called after a Header is added?
Source & Destination Ports
Segment
Segments
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 Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Source and Destination 'IP addresses'
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
Frames

12. 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
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
Source and Destination MAC address

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

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

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

16. What is a SDU (Service Data Unit)?
Layer 2
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 IP address
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. Where does the process of data encapsulation start?
Data
Layer 2
It start in the upper layers and works is way down?
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.

18. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
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
Prepare the data to be sent through the network
Segments
Segment

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

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

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

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

23. In general What are the responsibility of the upper layers?
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
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?

24. Which OSI model layer uses service data units called frames?
Layer 2
Source and Destination MAC address
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Segment