OSI Model

Question 1

How many layers are in the OSI model?

Answer 1

7

Question 2

What is layer 7’s name and function?

Answer 2

Application: The Application layer provides services to the software through which the user requests network services. Your computer application software is not on the Application layer. This layer isn’t about applications and doesn’t contain any applications. In other words, programs such as Microsoft Word or Corel are not at this layer, but browsers, FTP clients, and mail clients are.

Question 3

What is layer 6’s name and function?

Answer 3

Presentation: This layer is concerned with data representation and code formatting.

Question 4

What is layer 5’s name and function?

Answer 4

Session: The Session layer establishes, maintains, and manages the communication session between computers.

Question 5

What is layer 4’s name and function?

Answer 5

Transport: The functions defined in this layer provide for the reliable transmission of data segments, as well as the disassembly and assembly of the data before and after transmission.

Question 6

What is layer 3’s name and function?

Answer 6

Network: This is the layer on which routing takes place. The Network layer defines the processes used to route data across the network and the structure and use of logical addressing.

Question 7

What is layer 2’s name and function?

Answer 7

Data Link: As its name suggests, this layer is concerned with the linkages and mechanisms used to move data about the network, including the topology, such as Ethernet or Token Ring, and deals with the ways in which data is reliably transmitted.

Question 8

What is layer 1’s name and function?

Answer 8

Physical: The Physical layer’s name says it all. This layer defines the electrical and physical specifications for the networking media that carry the data bits across a network.

Question 9

What is PDU?

Answer 9

Protocol Data Unit. The package of data that moves through the layers. As the data is reformatted and repackaged, it takes on unique names on certain layers.

Question 10

PDU name at application layer?

Answer 10

Data

Question 11

PDU name at presentation layer?

Answer 11

Data

Question 12

PDU name at session layer?

Answer 12

Data

Question 13

PDU name at transport layer?

Answer 13

Segment

Question 14

PDU name at network layer?

Answer 14

Packet

Question 15

PDU name at data link layer?

Answer 15

Frame

Question 16

PDU name at physical layer?

Answer 16

Bits

Question 17

What does OSI stand for?

Answer 17

Open Systems Interconnect