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13 Cards in this Set
- Front
- Back
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What is the OSI model?
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Open Systems Interconnection (OSI). It is the architectural standard for inter-computer communications. |
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What are the benefits of the OSI model's implementation? |
OSI provides interoperability and compatibility between networks which may have different networking implementations (different hardware & software). |
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How is data transmitted using the OSI model? |
Data sent from one device goes down the seven layers and back up again on the receiving device. Each layer performs a particular function on the data passed to it and applies a header to it, which is stripped off when it is received at the corresponding layer. |
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What is TLS? |
Transport Layer Security. It is a protocol which acts on the fourth layer of the OSI model. It provides authenticity and security services for communications. It is intended to prevent communications data from being tapped or tampered. |
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What is the function of the seventh layer of the OSI model? |
Application Layer: Provides network services for software applications and end-user applications (messaging, file transfers). |
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What is the function of the sixth layer of the OSI model? |
Presentation Layer: Handles data representation. Data between machines may be represented differently to each other, so the presentation layer provides data transformations so that the application layer on the other machine can accept the data. |
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What is the function of the fifth layer of the OSI model? |
Session Layer: Handles the communication session. It is responsible for establishing, maintaining and ending any communication sessions between applications. |
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What is the function of the fourth layer of the OSI model? |
Transport Layer: Handles the end-to-end communications. Controls the flow of data (traffic), error checking & error correction, and connection quality & reliability. TLS is present is this layer, as well as TCP and UDP. |
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What is the function of the third layer of the OSI model? |
Network Layer: Handles data switching and routing technologies. Packets that reach the router have their destination address checked. If it is not at the destination, it is sent back down the layers, otherwise it continues upwards. |
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What is the function of the second layer of the OSI model? |
Data-Link: Divided into 2 sub-layers: MAC (Media Access Control) and LLC (Logical Link Control). The LLC layer acts above the MAC layer. It handles frames (sync, flow control, errors). The MAC layer handles how computers gain access to data on a network and its data access permissions |
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What is the function of the first layer of the OSI model? |
Physical: Concerns the physical hardware of the network. Provides the hardware means for sending and receiving data across a carrier. For example, the cabling, multiplexing, bit-rate, and topology. |
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Which layers focus on application-level data handling? |
Layers 5-7 (the upper layers). |
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Which layers are concerned with moving data around? |
Layers 1-4 (the lower layers). |
