OSI Model Functionality

Question 1

7 Layers of OSI Model

Answer 1

Application, Presentation, Session, Transport, Network, Data-Link, Physical - All People Seem To Need Data Processing

Question 2

Physical

Answer 2

Cables or fiber, problem with cable or punch-down, run loopback test, replace cables, or swap adapter cards for troubleshooting

Question 3

Data-Link

Answer 3

Data-link control protocols. On an ethernet network, MAC addresses that are communicating; switching, bridging, or two devices with MAC addresses communicating.

Question 4

Network

Answer 4

AKA routing layer, dealing with any type of IP address. This layer also functions for fragmentating data to traverse different networks if a packet is too large to enter a new network.

Question 5

Transport

Answer 5

Usually using TCP or UDP, at this layer packets are put together to form the bigger picture

Question 6

Session

Answer 6

Many applications handle their own process of starting and ending a communication, which occurs at this layer. Also the layer where you’ll see certain control protocols communicate between application endpoints, as well as any tunneling.

Question 7

Presentation

Answer 7

Character encoding occurs here, as well as any encrypting or decrypting. Many of the applications that work at layer 6 may also be working at layer 7, so it’s not uncommon to see many application protocols sharing both layer 6 and layer 7 simultaneously.

Question 8

Application

Answer 8

It’s the layer that we can see, which might be a browser window. We might be transferring a file, or we might be downloading some mail.