OSI Model

Question 1

Layer 1

Answer 1

Physical

Question 2

Layer 2

Answer 2

Data Link

Question 3

Layer 3

Answer 3

Network

Question 4

Layer 4

Answer 4

Transport

Question 5

Layer 5

Answer 5

Session

Question 6

Layer 6

Answer 6

Presentation

Question 7

Layer 7

Answer 7

Application

Question 8

Concerned with the transmission and reception of the unstructured raw bit stream over the physical medium

Answer 8

Physical

Question 9

Provides error free transfer of data frame from one node to another over the Physical layer

Answer 9

Data Link

Question 10

Controls the operations of the subnet, deciding which physical path the data takes

Answer 10

Network

Question 11

Ensures that the messages are delivered error-free, in sequence, with no losses or duplications

Answer 11

Transport

Question 12

Allows session establishment between processes running on different stations

Answer 12

Session

Question 13

Formats the data to be presented to the Application layer. It can be viewed as the ‘Translator’ for the network.

Answer 13

Presentation

Question 14

Serves as the window for users and application processes to access the network

Answer 14

Application

Question 15

Physical Structure (Cables, hubs)

Answer 15

Physical

Question 16

Frames (‘envelopes’, contains MAC address)

Answer 16

Data Link

Question 17

Packets (‘letter’, contain IP address) (Packet filtering)

Answer 17

Network

Question 18

TCP (Host to Host, Flow Control) (Packet Filtering)

Answer 18

Transport

Question 19

Sync & Send to Ports (logical ports)

Answer 19

Session

Question 20

Syntax Layer (encrypt & decrypt)

Answer 20

Presentation

Question 21

End User Layer (Program that opens what was sent or creates what is to be sent)

Answer 21

Application