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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. Where does the process of data encapsulation start?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Converts the frames into bits for transmission across the transmission media
It start in the upper layers and works is way down?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

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

3. What is data called after a Header is added?
Layer 2
Segment
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'

4. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Frames
Segments
Packet
Prepare the data to be sent through the network

5. What is the short description of the encapsulation process?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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

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

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

8. In general What are the responsibility of the upper layers?
Source and Destination 'MAC addresses'
Segment
Prepare the data to be sent through the network
Decapsulation

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

10. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
Source and Destination MAC address
Packet
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

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

12. What gets added to the service data unit at the Data Link layer?
Data
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
Layer 2
Source and Destination MAC address

13. What is a PDU (Protocol Data Unit)?
Converts the frames into bits for transmission across the transmission media
Source and Destination IP address
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

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

15. What is the process called at the receiving Host?
Layer 2
Segments
Decapsulation
Source and Destination IP address

16. What is a SDU (Service Data Unit)?
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
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

17. Which OSI model layer uses service data units called frames?
Layer 2
It start in the upper layers and works is way down?
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

18. What gets added to the service data unit at the Network layer?
Source and Destination IP address
Frames
Source and Destination 'IP addresses'
It start in the upper layers and works is way down?

19. 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.
Layer 2
Segment
Source and Destination MAC address

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

21. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Layer 2
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
Segments
Packet

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

23. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
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'
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'

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