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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 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
Segment
Source and Destination IP address
Prepare the data to be sent through the network

2. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Prepare the data to be sent through the network
Source and Destination 'IP addresses'
Segment
Data

3. 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?
Segment
Prepare the data to be sent through the network
Frames

4. What is the short description of the encapsulation process?
Frames
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
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.

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

6. Which OSI model layer uses service data units called frames?
Frames
Source and Destination 'IP addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Layer 2

7. What is a PDU (Protocol Data Unit)?
Source & Destination Ports
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.
Converts the frames into bits for transmission across the transmission media

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

9. What happens to data at layer 4 (Transport)?
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
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
It start in the upper layers and works is way down?

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

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

12. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Packet
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.
Source & Destination Ports

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

14. Where does the process of data encapsulation start?
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.
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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

15. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Converts the frames into bits for transmission across the transmission media
Segments
Source and Destination 'IP addresses'
Source and Destination 'MAC addresses'

16. What gets added to the service data unit at the Data Link layer?
Source and Destination MAC 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
Source and Destination 'MAC addresses'
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'

17. What is a SDU (Service Data Unit)?
It start in the upper layers and works is way down?
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.
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

18. What is the layer 4 (Transport) control information that is added to the Header?
Converts the frames into bits for transmission across the transmission media
Source & Destination Ports
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
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits

19. What is the process called at the receiving Host?
Packet
Source and Destination 'MAC addresses'
Decapsulation
Layer 2

20. In general What are the responsibility of the upper layers?
Segment
Source and Destination 'IP addresses'
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Prepare the data to be sent through the network

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

22. What gets added to the service data unit at the Network 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
Source and Destination IP address
Source & Destination Ports

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

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