OSI Model
The Open Systems Interconnection (OSI) model is a classic seven-layer conceptual framework used for teaching network architecture, ordered from physical signaling at the bottom to end-user software at the top:
- Physical Layer: Handles transmission of raw signals over physical cables, radio frequencies, and voltages.
- Data Link Layer: Manages point-to-point data transfer between directly connected devices using hardware MAC addresses.
- Network Layer: Routes data packets across multiple interconnected networks using IP addresses.
- Transport Layer: Coordinates end-to-end delivery of messages between running programs using protocols such as TCP and UDP.
- Session Layer: Establishes and manages ongoing communication sessions between applications.
- Presentation Layer: Handles data formatting, translation, and encryption.
- Application Layer: Interfaces directly with user-facing software, such as web browsers and email clients.
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Prep Sessions
Network Architecture and Data Flow: From Packets to Protocols @ University of Michigan - Ann Arbor
Ch.1 Network Foundations and Models - Network Architecture and Data Flow: From Packets to Protocols @ University of Michigan - Ann Arbor
The OSI and TCP/IP Layered Models - Network Architecture and Data Flow: From Packets to Protocols @ University of Michigan - Ann Arbor
Related
Layered Network Model
OSI Model
Data Encapsulation and Decapsulation
The Internet
TCP/IP Model
In a layered network model, what does an individual layer directly rely upon to carry out its operations?
True or False: In a layered network model, an individual layer is responsible for executing all networking functions from end to end.
How does a layered network model organize complex networking functions, and what is the operational responsibility of each individual layer?
An engineering team plans to modify a protocol implementation at one specific tier of a network stack. Based on the principles of a layered network model, explain how this modification can be carried out and describe its impact on the rest of the system.
OSI Model
Data Encapsulation and Decapsulation
TCP/IP Model
Learn After
Match each OSI model layer to its correct networking responsibility.
In the OSI model, the ___ Layer coordinates end-to-end delivery of messages between running programs using protocols such as TCP and UDP.
Order these OSI model layers from the bottom (physical signaling) toward the top (user-facing software).
Based on the OSI model, which layer is failing to route data packets across multiple interconnected networks using IP addresses, and which lower layer is functioning properly by managing point-to-point data transfer between directly connected devices using hardware MAC addresses?