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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 data at layer 4 (Transport)?
Decapsulation
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
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

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

3. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
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'
Segments
Source and Destination IP address

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

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

6. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Frames
Data
Source and Destination 'IP addresses'
Packet

7. What gets added to the service data unit at the Data Link layer?
Packet
Frames
Source and Destination MAC 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

8. What is a SDU (Service Data Unit)?
Source and Destination 'MAC 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.
Segment

9. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Layer 2
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.

10. What happens to the PDU at layer 1(Physical)?
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
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

11. What is a MPDU (MAC Protocol Data Unit)?
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
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.

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

13. What is data called after a Header is added?
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
Segment
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

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

15. In general What are the responsibility of the upper layers?
Prepare the data to be sent through the network
Segments
Converts the frames into bits for transmission across the transmission media
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

16. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Segments
Source and Destination MAC address
Segment
Frames

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

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

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

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

21. What is the short description of the encapsulation process?
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'
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.

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

23. What is a PDU (Protocol Data Unit)?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
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.
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 'MAC addresses'

24. What is the process called at the receiving Host?
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.
Data
Source and Destination IP address