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?
- A collection of interconnected devices that can communicate and share resources
- What is the OSI model?
- A conceptual seven-layer framework describing how network communication functions
- What are the seven layers of the OSI model, from top to bottom?
- Application, Presentation, Session, Transport, Network, Data Link, Physical
- What is the Application layer of the OSI model responsible for?
- Providing network services directly to end-user applications
- What is the Presentation layer of the OSI model responsible for?
- Translating, encrypting, and compressing data between systems
- What is the Session layer of the OSI model responsible for?
- Establishing, managing, and terminating communication sessions
- What is the Transport layer of the OSI model responsible for?
- Reliable end-to-end data delivery and error recovery
- What is the Network layer of the OSI model responsible for?
- Logical addressing and routing packets across networks
- What is the Data Link layer of the OSI model responsible for?
- Node-to-node data transfer and error detection on a single network segment
- What is the Physical layer of the OSI model responsible for?
- Transmitting raw bits over a physical medium
- What is the TCP/IP model?
- A four-layer practical networking model underlying the modern internet
- What are the four layers of the TCP/IP model?
- Application, Transport, Internet, and Network Access
- How does the TCP/IP model's Internet layer relate to the OSI model?
- It roughly corresponds to the OSI Network layer
- What is a protocol, in networking?
- An agreed-upon set of rules governing how data is formatted and transmitted
- What is encapsulation, in the context of network layers?
- Wrapping data with layer-specific headers as it moves down the protocol stack
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