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 data called after the Source and Destination 'IP addresses' are added at layer 3 (Network)?
Prepare the data to be sent through the network
Layer 2
Packet
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


2. What is a MPDU (MAC Protocol Data Unit)?
Converts the segments into packets - adding logical network and device addresses i.e. the PDU is encapsulated with the Source and Destination 'IP 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
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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.


3. What is data called after the Source and Destination 'MAC addresses' are added at layer 2 (Data Link)?
Packet
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Frames
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.


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


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


6. What is a PDU (Protocol Data Unit)?
Converts the frames into bits for transmission across the transmission media
Data
Packet
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


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


8. What is the short description of the encapsulation process?
Decapsulation
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
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


9. In general What are the responsibility of the upper layers?
Prepare the data to be sent through the network
Segment
Source and Destination 'MAC addresses'
Converts the frames into bits for transmission across the transmission media


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


11. Which OSI model layer uses service data units called frames?
Layer 2
Data
Frames
Segment


12. What is data called after a Header is added?
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Segment
Source & Destination Ports
Data


13. What happens to data at layer 4 (Transport)?
Source and Destination 'IP addresses'
Layer 2
1st level of encapsulation - breaks the data into pieces called segments - adding sequencing and control information
Source and Destination IP address


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


15. What is the layer 4 (Transport) control information that is added to the Header?
Upper layers--data - Transport layer--segments - Network layer--packets containing logical addresses - Data Link layer--framing that adds physical addresses - Physical layer--bits
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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Source & Destination Ports


16. Where does the process of data encapsulation start?
It start in the upper layers and works is way down?
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Packet
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


17. When moving from top to bottom through the OSI model layers - which comes first - packets or segments?
Segments
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
A message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
Packet


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


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


20. What is a SDU (Service Data Unit)?
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 IP address
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


21. What happens to the PDU at layer 1(Physical)?
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.
Packet
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'


22. What is Service Data Unit (SDU) comsidered in layers 5 -6 &7?
Segments
Converts the packets into frames - adding physical device addressing information i.e.the PDU is encapsulated with the Source and Destination 'MAC addresses'
Data
Source and Destination 'MAC addresses'


23. What gets added to the service data unit at the Network layer?
Data
Prepare the data to be sent through the network
Source and Destination IP address
Decapsulation


24. What is the process called at the receiving Host?
Source and Destination IP address
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.
Decapsulation