OSI Model

Question 1

Which layer contains the actual cables and wires that you can touch with your hands? At this layer, the actual electrical signals, or light waves, or radios waves are defined.

Answer 1

Layer One: Physical Layer

Question 2

Which layer is how your device “talks” to this physical medium, and how other devices find your device on the network? Here is the world of the MAC address. Most switches function only on this layer. They are told by the next layer (Network) what mac address is needed.

Answer 2

Layer 2: Data Link

Question 3

Which layer is where the IP protocol lives? After a long war, it’s pretty much the only one left standing for most communications at this layer. IP is interested in getting the traffic from the source to the destination. It allows communications to find a path anywhere in the world, regardless of the underlying physical layers.

Answer 3

Layer 3: Network

Question 4

Which layer concerns specific ways that data is packaged up for transport on IP. Most traffic is simply TCP or UDP at this point, but there’s a wide variety of other stuff at this layer as well. The biggest concepts here are that TCP is stateful, meaning it expects to receive a response for each packet, while UDP is stateless. It doesn’t really care if you respond or not, it just sort of “throws” the packets at the other end.

Answer 4

Layer 4: Transport

Question 5

Which layer manages connections and is responsible for controlling ports and sessions?

Answer 5

Layer 5 - Session

Question 6

Which layer ensures that data is in a usable format and is where data encryption occurs?

Answer 6

Layer 6: Presentation

Question 7

Which layer is the human-computer interaction layer, where applications can access network services?

Answer 7

Layer 7: Application

Question 8

What 2 layers does ethernet operate in?

Answer 8

Physical (layer 1) and data link (layer 2)