ITN 101: OSI LAYER: TEST QUESTIONS WITH COMPLETE
SOLUTIONS
1) What is the Presentation Layer? -- Answer ✔✔ Responsible for reformatting,
compressing, and/or encrypting data in a way that the application on the receiving
end can read
2) Example of the Presentation Layer (real world practice) -- Answer ✔✔ An email
message can be encrypted at the presentation layer by the email client or by the
operating system
3) What is the Session Layer? -- Answer ✔✔ Describes how data between applications
is synced and recovered if messages don't arrive intact at the receiving application
4) Example of Session Layer (real world practice) -- Answer ✔✔ Zoom application
works with the operating system to establish and maintain a session between two
endpoints for as long as a voice conversation or video conference is in progress
5) Which layers are so intertwined that it's difficult to distinguish between them? --
Answer ✔✔ application, presentation, and session layer
, 6) What is the Transport Layer? -- Answer ✔✔ Responsible for transporting
application layer payloads from one application to another.
7) What are the two main Transport layer protocols? -- Answer ✔✔ TCP, UDP
8) What does TCP protocol do (Transport Layer)? -- Answer ✔✔ Makes a connection
with the end host, checks whether the data is received, and resends it if it is not.
9) What does UDP protocol do (Transport Layer)? -- Answer ✔✔ Does not guarantee
delivery because it doesn't maintain a connection to check whether data is received.
10) What is a Header (Transport Layer)? -- Answer ✔✔ Add control information in an
area at the beginning of the payload to create a message ready to be handed down
to the network layer.
11) What is Encapsulation (Transport Layer)? -- Answer ✔✔ The process of adding a
header to the data inherited from the layer above
12) What is a port (Transport Layer)? -- Answer ✔✔ A number that identifies a process,
such as an application or service, running on a computer.
13) What is it called when the transport layer divides a large message in a TCP protocol?
-- Answer ✔✔ segment
14) What is it called when the transport layer divides a large message in a UDP
protocol? -- Answer ✔✔ datagram
SOLUTIONS
1) What is the Presentation Layer? -- Answer ✔✔ Responsible for reformatting,
compressing, and/or encrypting data in a way that the application on the receiving
end can read
2) Example of the Presentation Layer (real world practice) -- Answer ✔✔ An email
message can be encrypted at the presentation layer by the email client or by the
operating system
3) What is the Session Layer? -- Answer ✔✔ Describes how data between applications
is synced and recovered if messages don't arrive intact at the receiving application
4) Example of Session Layer (real world practice) -- Answer ✔✔ Zoom application
works with the operating system to establish and maintain a session between two
endpoints for as long as a voice conversation or video conference is in progress
5) Which layers are so intertwined that it's difficult to distinguish between them? --
Answer ✔✔ application, presentation, and session layer
, 6) What is the Transport Layer? -- Answer ✔✔ Responsible for transporting
application layer payloads from one application to another.
7) What are the two main Transport layer protocols? -- Answer ✔✔ TCP, UDP
8) What does TCP protocol do (Transport Layer)? -- Answer ✔✔ Makes a connection
with the end host, checks whether the data is received, and resends it if it is not.
9) What does UDP protocol do (Transport Layer)? -- Answer ✔✔ Does not guarantee
delivery because it doesn't maintain a connection to check whether data is received.
10) What is a Header (Transport Layer)? -- Answer ✔✔ Add control information in an
area at the beginning of the payload to create a message ready to be handed down
to the network layer.
11) What is Encapsulation (Transport Layer)? -- Answer ✔✔ The process of adding a
header to the data inherited from the layer above
12) What is a port (Transport Layer)? -- Answer ✔✔ A number that identifies a process,
such as an application or service, running on a computer.
13) What is it called when the transport layer divides a large message in a TCP protocol?
-- Answer ✔✔ segment
14) What is it called when the transport layer divides a large message in a UDP
protocol? -- Answer ✔✔ datagram
