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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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)?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Decapsulation
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

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

3. What is data called after a Header is added?
Source & Destination Ports
Segment
Converts the frames into bits for transmission across the transmission media
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

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

5. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Decapsulation
Frames
It start in the upper layers and works is way down?
Packet

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

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

8. What is the process called at the receiving Host?
Packet
Decapsulation
Data
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.

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

10. 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
Decapsulation
Source and Destination 'IP addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information

11. What gets added to the service data unit at the Network layer?
Source and Destination IP 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
Segments
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.

12. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
Layer 2
Source & Destination Ports
Packet

13. What is a SDU (Service Data Unit)?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the 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.
Source and Destination MAC address

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

15. What is the layer 4 (Transport) control information that is added to the Header?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Source & Destination Ports
Segment
Source and Destination 'MAC addresses'

16. 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
Frames
Prepare the data to be sent through the network
Segments

17. What gets added to the service data unit at the Data Link layer?
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'
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

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

19. What is a MPDU (MAC Protocol Data Unit)?
It start in the upper layers and works is way down?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination MAC address
Source and Destination IP address

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

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

22. Where does the process of data encapsulation start?
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?
Layer 2
Source and Destination 'MAC addresses'

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

24. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
Segment
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
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