An easy way to remember the order of the layers is:
A-ll
P-eople
S-eem
T-o
N-eed
D-ata
P-rocessing
3. At which layer of the OSI model is a path decision made based upon an IP address?
Answer: Network
At the network layer, data is transported in the form of a packet.
4. Which of the following takes place at the presentation layer?
Answer: Encryption
The presentation layer encrypts data to be sent across the network, and decrypts it so it can be accessed by the application layer on the receiving end.
5. Which is NOT a function of the Application layer?
Answer: Windowing
Quality of Service and user authentication are also handled by the application layer.
6. Data is transported in bits at the physical layer.
Answer: True
A bit is simply a binary digit. Either a 0 or a 1.
7. Data is transported in segments at the Data Link layer.
Answer: False
At the data link layer, user data is encapsulated in a frame.
8. Which layer of the OSI model contains the LLC sublayer and the MAC sublayer?
Answer: Data Link Layer
The LLC and MAC sublayers allow for different layer 2 protocols to be used, such as Ethernet, Token Ring and FDDI.
9. The Session Layer is layer 7 of the OSI Model.
Answer: False
The Session layer is layer 5. It provides synchronization for voice and video connections.
10. Communication at the Transport layer is connectionless.
Answer: False
The Transport Layer provides connection orientated communication. TCP and SPX are examples of connection orientated protocols at Layer 4.
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