Computer Networks, unit: Network Models (OSI and TCP/IP). Core concepts, terminology, and worked-example cues a college student meets for this unit, building on prior units without repeating them. Front: a term, concept, or short problem cue. Back: the definition, explanation, or answer.
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- What is a computer network?
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A collection of interconnected devices that can communicate and share resources- What is the OSI model?
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A conceptual seven-layer framework describing how network communication functions- What are the seven layers of the OSI model, from top to bottom?
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Application, Presentation, Session, Transport, Network, Data Link, Physical- What is the Application layer of the OSI model responsible for?
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Providing network services directly to end-user applications- What is the Presentation layer of the OSI model responsible for?
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Translating, encrypting, and compressing data between systems- What is the Session layer of the OSI model responsible for?
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Establishing, managing, and terminating communication sessions- What is the Transport layer of the OSI model responsible for?
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Reliable end-to-end data delivery and error recovery- What is the Network layer of the OSI model responsible for?
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Logical addressing and routing packets across networks- What is the Data Link layer of the OSI model responsible for?
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Node-to-node data transfer and error detection on a single network segment- What is the Physical layer of the OSI model responsible for?
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Transmitting raw bits over a physical medium- What is the TCP/IP model?
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A four-layer practical networking model underlying the modern internet- What are the four layers of the TCP/IP model?
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Application, Transport, Internet, and Network Access- How does the TCP/IP model's Internet layer relate to the OSI model?
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It roughly corresponds to the OSI Network layer- What is a protocol, in networking?
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An agreed-upon set of rules governing how data is formatted and transmitted- What is encapsulation, in the context of network layers?
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Wrapping data with layer-specific headers as it moves down the protocol stack
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