OSI Model Layers Transcript

Question 1

What is the purpose of segmenting data at the transport layer?

Answer 1

To divide data into smaller blocks called segments for transmission.

Question 2

How does the transport layer help identify lost segments during transmission?

Answer 2

By assigning a sequence number to each block of data.

Question 3

Why is flow control important at the transport layer?

Answer 3

To manage the speed of data transmission between hosts.

Question 4

What is the difference between TCP and UDP in terms of connection handling?

Answer 4

TCP is connection-oriented, while UDP is connectionless.

Question 5

Explain the role of port numbers at the transport layer.

Answer 5

Port numbers identify upper layer services on a server.

Question 6

How are routing protocols relevant to the network layer?

Answer 6

Routing protocols determine the path data takes between routers.

Question 7

Why are IP addresses assigned at the network layer?

Answer 7

To uniquely identify devices within an internetwork.

Question 8

Describe the responsibility of the data link layer regarding transmission media.

Answer 8

It interfaces between physical devices and the network layer.

Question 9

What are the sublayers of the data link layer and their functions?

Answer 9

LLC provides interface, and MAC controls physical medium access.

Question 10

What is the purpose of a CRC in a frame at the data link layer?

Answer 10

To help identify errors that may have occurred during transmission.

Question 11

What is the purpose of grouping OSI layers?

Answer 11

Grouping helps understand network troubleshooting and architecture better.

Question 12

How are the OSI layers commonly grouped?

Answer 12

Bottom two layers related to hardware; top five layers are networking protocols.

Question 13

What does the application layer in OSI model handle?

Answer 13

Integrating network services with the operating system.

Question 14

Which protocols are associated with the application layer in OSI model?

Answer 14

HTTP, FTP, TFTP, SMTP

Question 15

What is the function of the presentation layer in OSI model?

Answer 15

Deals with syntax, encryption, and compression.

Question 16

What is the session layer responsible for in OSI model?

Answer 16

Creating and terminating sessions between communication devices.

Question 17

How does the session layer keep data streams separated?

Answer 17

Uses session ID to identify unique sessions.

Question 18

Describe the role of the transport layer in OSI model.

Answer 18

Responsible for segmenting and delivering data on a network.

Question 19

Give an example of a session in OSI model.

Answer 19

Multiple clients connected to a Web server.

Question 20

Which layer is responsible for delivering data in OSI model?

Answer 20

The transport layer.

Question 21

What does the link layer define?

Answer 21

The logical topology of the network and how devices access the media.

Question 22

What does the physical layer work with?

Answer 22

Physical hardware such as cables, connectors, and devices.

Question 23

Give an example of a protocol defined by the physical layer.

Answer 23

CAT6 for cables used in the network and RJ-45 for connectors.

Question 24

How does data transform at the physical layer?

Answer 24

It becomes electrical impulses, light pulses, or radio signals.

Question 25

What is the function of the session layer?

Answer 25

Creating session IDs to distinguish between client communications.

Question 26

What are the transport and network layers responsible for?

Answer 26

Delivering segments and packets through the network.

Question 27

What are the lower two OSI model layers responsible for?

Answer 27

Sending data between devices.

Question 28

How can understanding OSI model layers help troubleshoot a network?

Answer 28

By enabling effective communication with other network administrators.