Cisco Certification Data Encapsulation

Instructions:

• Answer 24 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• 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 is a SDU (Service Data Unit)?
Source & Destination Ports
Prepare the data to be sent through the network
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


2. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC 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.
Frames
Segment


3. 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
Decapsulation
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Segment


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

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5. 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
Frames
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


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

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


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

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

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10. What gets added to the service data unit at the Data Link layer?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
Source and Destination MAC address
Source and Destination 'MAC addresses'


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

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12. In general What are the responsibility of the upper layers?
Prepare the data to be sent through the network
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
Data


13. What gets added to the service data unit at the Network layer?
Source and Destination IP address
Layer 2
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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


14. What is a MPDU (MAC Protocol Data Unit)?
Data
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
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
Segment


15. What is a PDU (Protocol Data Unit)?
Layer 2
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
Segment
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.


16. What is the short description of the encapsulation process?
Layer 2
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
Packet


17. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
Source & Destination Ports
Frames
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'


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

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19. What happens to data at layer 4 (Transport)?
It start in the upper layers and works is way down?
Decapsulation
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits


20. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination IP address
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Packet


21. Which OSI model layer uses service data units called frames?
Layer 2
Packet
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Prepare the data to be sent through the network


22. What is the process called at the receiving Host?
Decapsulation
Packet
Source and Destination MAC address
Source and Destination 'MAC addresses'


23. Where does the process of data encapsulation start?
It start in the upper layers and works is way down?
Layer 2
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


24. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
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 'IP addresses'
Data
Converts the frames into bits for transmission across the transmission media