Special Sub-Topic: The OSI Reference Model
|What does the acronym OSI stand for?|
Open System Interconnection. The OSI reference model is used as a guide for teaching and understanding the way networks operate.
|There are seven layers in the OSI model. Which of the following is the correct order?|
Application, Presentation, Session, Transport, Network, DataLink, Physical. An easy way to remember the order of the layers is:
|At which layer of the OSI model is a path decision made based upon an IP address?|
Network. At the network layer, data is transported in the form of a packet.
|Which of the following takes place at the presentation layer?|
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.
|Which is NOT a function of the Application layer?|
Windowing. Quality of Service and user authentication are also handled by the application layer.
|Data is transported in bits at the Physical layer.|
t. A bit is simply a binary digit. Either a 0 or a 1.
|Data is transported in segments at the Data Link layer.|
f. At the data link layer, user data is encapsulated in a frame.
|Which layer of the OSI model contains the LLC sublayer and the MAC sublayer?|
Data Link Layer. The LLC and MAC sublayers allow for different layer 2 protocols to be used, such as Ethernet, Token Ring and FDDI.
|The Session Layer is layer 7 of the OSI Model.|
f. The Session layer is layer 5. It provides synchronization for voice and video connections.
|Communication at the Transport layer is connectionless.|
f. The Transport Layer provides connection orientated communication. TCP and SPX are examples of connection orientated protocols at Layer 4.
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