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. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
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 'IP addresses'
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
Segments


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


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

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

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

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6. Which OSI model layer uses service data units called frames?
Source and Destination MAC address
Layer 2
Segments
Source and Destination 'MAC addresses'


7. In general What are the responsibility of the upper layers?
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 & Destination Ports
Frames
Prepare the data to be sent through the network


8. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP addresses'
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Source and Destination 'IP addresses'
Frames


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

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

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11. What is a PDU (Protocol Data Unit)?
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
Frames
Layer 2


12. What happens to the PDU at layer 1(Physical)?
Converts the frames into bits for transmission across the transmission media
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 & Destination Ports
Source and Destination 'IP addresses'


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

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14. What is a SDU (Service 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.
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Segment


15. What is the short description of the encapsulation process?
Frames
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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


16. What is data called after a Header is added?
Segment
Source and Destination 'IP addresses'
Frames
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits


17. What is a MPDU (MAC Protocol Data Unit)?
Layer 2
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination IP address
Converts the frames into bits for transmission across the transmission media


18. Where does the process of data encapsulation start?
Segments
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
Frames
It start in the upper layers and works is way down?


19. What gets added to the service data unit at the Data Link layer?
Source & Destination Ports
Source and Destination MAC address
Segments
Source and Destination IP address


20. What is the layer 4 (Transport) control information that is added to the Header?
Segment
Layer 2
Converts the frames into bits for transmission across the transmission media
Source & Destination Ports


21. What is data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Frames
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
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'


22. What gets added to the service data unit at the Network layer?
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
Converts the frames into bits for transmission across the transmission media
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source and Destination IP address


23. What is the process called at the receiving Host?
Decapsulation
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 start in the upper layers and works is way down?
Segments


24. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Decapsulation
Data
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'